drm/nouveau/nvif: modify nvif_unvers/nvif_unpack macros to be more obvious

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvif/unpack.h

@@ -1,24 +1,28 @@
 #ifndef __NVIF_UNPACK_H__
 #define __NVIF_UNPACK_H__
 
-#define nvif_unvers(d) ({                                                      \
-	ret = (size == sizeof(d)) ? 0 : -ENOSYS;                               \
-	(ret == 0);                                                            \
+#define nvif_unvers(r,d,s,m) ({                                                \
+	void **_data = (d); __u32 *_size = (s); int _ret = (r);                \
+	if (_ret == -ENOSYS && *_size == sizeof(m)) {                          \
+		*_data = NULL;                                                 \
+		*_size = _ret = 0;                                             \
+	}                                                                      \
+	_ret;                                                                  \
 })
 
-#define nvif_unpack(d,vl,vh,m) ({                                              \
-	if ((vl) == 0 || ret == -ENOSYS) {                                     \
-		int _size = sizeof(d);                                         \
-		if (_size <= size && (d).version >= (vl) &&                    \
-				     (d).version <= (vh)) {                    \
-			data = (u8 *)data + _size;                             \
-			size = size - _size;                                   \
-			ret = ((m) || !size) ? 0 : -E2BIG;                     \
-		} else {                                                       \
-			ret = -ENOSYS;                                         \
+#define nvif_unpack(r,d,s,m,vl,vh,x) ({                                        \
+	void **_data = (d); __u32 *_size = (s);                                \
+	int _ret = (r), _vl = (vl), _vh = (vh);                                \
+	if (_ret == -ENOSYS && *_size >= sizeof(m) &&                          \
+	    (m).version >= _vl && (m).version <= _vh) {                        \
+		*_data = (__u8 *)*_data + sizeof(m);                           \
+		*_size = *_size - sizeof(m);                                   \
+		if (_ret = 0, !(x)) {                                          \
+			_ret = *_size ? -E2BIG : 0;                            \
+			*_data = NULL;                                         \
+			*_size = 0;                                            \
 		}                                                              \
 	}                                                                      \
-	(ret == 0);                                                            \
+	_ret;                                                                  \
 })
-
 #endif

drivers/gpu/drm/nouveau/nouveau_abi16.c

@@ -357,9 +357,9 @@ nouveau_abi16_usif(struct drm_file *file_priv, void *data, u32 size)
 	} *args = data;
 	struct nouveau_abi16_chan *chan;
 	struct nouveau_abi16 *abi16;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		switch (args->v0.type) {
 		case NVIF_IOCTL_V0_NEW:
 		case NVIF_IOCTL_V0_MTHD:

drivers/gpu/drm/nouveau/nouveau_usif.c

@@ -130,20 +130,21 @@ usif_notify_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
 		struct nvif_notify_req_v0 v0;
 	} *req;
 	struct usif_notify *ntfy;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		if (usif_notify_find(f, args->v0.index))
 			return -EEXIST;
 	} else
 		return ret;
 	req = data;
+	ret = -ENOSYS;
 
 	if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL)))
 		return -ENOMEM;
 	atomic_set(&ntfy->enabled, 0);
 
-	if (nvif_unpack(req->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, true))) {
 		ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply;
 		ntfy->route = req->v0.route;
 		ntfy->token = req->v0.token;
@@ -171,9 +172,9 @@ usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
 		struct nvif_ioctl_ntfy_del_v0 v0;
 	} *args = data;
 	struct usif_notify *ntfy;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		if (!(ntfy = usif_notify_find(f, args->v0.index)))
 			return -ENOENT;
 	} else
@@ -194,9 +195,9 @@ usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
 		struct nvif_ioctl_ntfy_del_v0 v0;
 	} *args = data;
 	struct usif_notify *ntfy;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		if (!(ntfy = usif_notify_find(f, args->v0.index)))
 			return -ENOENT;
 	} else
@@ -233,9 +234,9 @@ usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
 		struct nvif_ioctl_ntfy_put_v0 v0;
 	} *args = data;
 	struct usif_notify *ntfy;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		if (!(ntfy = usif_notify_find(f, args->v0.index)))
 			return -ENOENT;
 	} else
@@ -270,13 +271,13 @@ usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
 		struct nvif_ioctl_new_v0 v0;
 	} *args = data;
 	struct usif_object *object;
-	int ret;
+	int ret = -ENOSYS;
 
 	if (!(object = kmalloc(sizeof(*object), GFP_KERNEL)))
 		return -ENOMEM;
 	list_add(&object->head, &cli->objects);
 
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		object->route = args->v0.route;
 		object->token = args->v0.token;
 		args->v0.route = NVDRM_OBJECT_USIF;
@@ -310,7 +311,7 @@ usif_ioctl(struct drm_file *filp, void __user *user, u32 argc)
 	if (ret = -EFAULT, copy_from_user(argv, user, size))
 		goto done;
 
-	if (nvif_unpack(argv->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(-ENOSYS, &data, &size, argv->v0, 0, 0, true))) {
 		/* block access to objects not created via this interface */
 		owner = argv->v0.owner;
 		if (argv->v0.object == 0ULL)

drivers/gpu/drm/nouveau/nvkm/core/client.c

@@ -97,7 +97,7 @@ nvkm_client_notify_new(struct nvkm_object *object,
 		struct nvif_notify_req_v0 v0;
 	} *req = data;
 	u8  index, reply;
-	int ret;
+	int ret = -ENOSYS;
 
 	for (index = 0; index < ARRAY_SIZE(client->notify); index++) {
 		if (!client->notify[index])
@@ -112,7 +112,7 @@ nvkm_client_notify_new(struct nvkm_object *object,
 		return -ENOMEM;
 
 	nvif_ioctl(object, "notify new size %d\n", size);
-	if (nvif_unpack(req->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, true))) {
 		nvif_ioctl(object, "notify new vers %d reply %d route %02x "
 				   "token %llx\n", req->v0.version,
 			   req->v0.reply, req->v0.route, req->v0.token);
@@ -144,10 +144,10 @@ nvkm_client_mthd_devlist(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nv_client_devlist_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "client devlist size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "client devlist vers %d count %d\n",
 			   args->v0.version, args->v0.count);
 		if (size == sizeof(args->v0.device[0]) * args->v0.count) {

drivers/gpu/drm/nouveau/nvkm/core/ioctl.c

@@ -34,10 +34,10 @@ nvkm_ioctl_nop(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_nop_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "nop size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "nop vers %lld\n", args->v0.version);
 		args->v0.version = NVIF_VERSION_LATEST;
 	}
@@ -52,10 +52,10 @@ nvkm_ioctl_sclass(struct nvkm_object *object, void *data, u32 size)
 		struct nvif_ioctl_sclass_v0 v0;
 	} *args = data;
 	struct nvkm_oclass oclass;
-	int ret, i = 0;
+	int ret = -ENOSYS, i = 0;
 
 	nvif_ioctl(object, "sclass size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "sclass vers %d count %d\n",
 			   args->v0.version, args->v0.count);
 		if (size != args->v0.count * sizeof(args->v0.oclass[0]))
@@ -86,10 +86,10 @@ nvkm_ioctl_new(struct nvkm_object *parent, void *data, u32 size)
 	struct nvkm_client *client = parent->client;
 	struct nvkm_object *object = NULL;
 	struct nvkm_oclass oclass;
-	int ret, i = 0;
+	int ret = -ENOSYS, i = 0;
 
 	nvif_ioctl(parent, "new size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(parent, "new vers %d handle %08x class %08x "
 				   "route %02x token %llx object %016llx\n",
 			   args->v0.version, args->v0.handle, args->v0.oclass,
@@ -147,10 +147,10 @@ nvkm_ioctl_del(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_del none;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "delete size %d\n", size);
-	if (nvif_unvers(args->none)) {
+	if (!(ret = nvif_unvers(ret, &data, &size, args->none))) {
 		nvif_ioctl(object, "delete\n");
 		nvkm_object_fini(object, false);
 		nvkm_object_del(&object);
@@ -165,10 +165,10 @@ nvkm_ioctl_mthd(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_mthd_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "mthd size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "mthd vers %d mthd %02x\n",
 			   args->v0.version, args->v0.method);
 		ret = nvkm_object_mthd(object, args->v0.method, data, size);
@@ -189,10 +189,10 @@ nvkm_ioctl_rd(struct nvkm_object *object, void *data, u32 size)
 		u16 b16;
 		u32 b32;
 	} v;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "rd size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "rd vers %d size %d addr %016llx\n",
 			   args->v0.version, args->v0.size, args->v0.addr);
 		switch (args->v0.size) {
@@ -223,10 +223,10 @@ nvkm_ioctl_wr(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_wr_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "wr size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object,
 			   "wr vers %d size %d addr %016llx data %08x\n",
 			   args->v0.version, args->v0.size, args->v0.addr,
@@ -251,10 +251,10 @@ nvkm_ioctl_map(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_map_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "map size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "map vers %d\n", args->v0.version);
 		ret = nvkm_object_map(object, &args->v0.handle,
 					      &args->v0.length);
@@ -269,10 +269,10 @@ nvkm_ioctl_unmap(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_unmap none;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "unmap size %d\n", size);
-	if (nvif_unvers(args->none)) {
+	if (!(ret = nvif_unvers(ret, &data, &size, args->none))) {
 		nvif_ioctl(object, "unmap\n");
 	}
 
@@ -286,10 +286,10 @@ nvkm_ioctl_ntfy_new(struct nvkm_object *object, void *data, u32 size)
 		struct nvif_ioctl_ntfy_new_v0 v0;
 	} *args = data;
 	struct nvkm_event *event;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "ntfy new size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "ntfy new vers %d event %02x\n",
 			   args->v0.version, args->v0.event);
 		ret = nvkm_object_ntfy(object, args->v0.event, &event);
@@ -312,10 +312,10 @@ nvkm_ioctl_ntfy_del(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_ntfy_del_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "ntfy del size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "ntfy del vers %d index %d\n",
 			   args->v0.version, args->v0.index);
 		ret = nvkm_client_notify_del(client, args->v0.index);
@@ -331,10 +331,10 @@ nvkm_ioctl_ntfy_get(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_ntfy_get_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "ntfy get size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "ntfy get vers %d index %d\n",
 			   args->v0.version, args->v0.index);
 		ret = nvkm_client_notify_get(client, args->v0.index);
@@ -350,10 +350,10 @@ nvkm_ioctl_ntfy_put(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct nvif_ioctl_ntfy_put_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "ntfy put size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "ntfy put vers %d index %d\n",
 			   args->v0.version, args->v0.index);
 		ret = nvkm_client_notify_put(client, args->v0.index);
@@ -421,12 +421,12 @@ nvkm_ioctl(struct nvkm_client *client, bool supervisor,
 	union {
 		struct nvif_ioctl_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	client->super = supervisor;
 	nvif_ioctl(object, "size %d\n", size);
 
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object,
 			   "vers %d type %02x object %016llx owner %02x\n",
 			   args->v0.version, args->v0.type, args->v0.object,

drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c

@@ -38,10 +38,10 @@ nvkm_control_mthd_pstate_info(struct nvkm_control *ctrl, void *data, u32 size)
 		struct nvif_control_pstate_info_v0 v0;
 	} *args = data;
 	struct nvkm_clk *clk = ctrl->device->clk;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(&ctrl->object, "control pstate info size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(&ctrl->object, "control pstate info vers %d\n",
 			   args->v0.version);
 	} else
@@ -76,10 +76,10 @@ nvkm_control_mthd_pstate_attr(struct nvkm_control *ctrl, void *data, u32 size)
 	struct nvkm_cstate *cstate;
 	int i = 0, j = -1;
 	u32 lo, hi;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(&ctrl->object, "control pstate attr size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(&ctrl->object,
 			   "control pstate attr vers %d state %d index %d\n",
 			   args->v0.version, args->v0.state, args->v0.index);
@@ -144,10 +144,10 @@ nvkm_control_mthd_pstate_user(struct nvkm_control *ctrl, void *data, u32 size)
 		struct nvif_control_pstate_user_v0 v0;
 	} *args = data;
 	struct nvkm_clk *clk = ctrl->device->clk;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(&ctrl->object, "control pstate user size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(&ctrl->object,
 			   "control pstate user vers %d ustate %d pwrsrc %d\n",
 			   args->v0.version, args->v0.ustate, args->v0.pwrsrc);

drivers/gpu/drm/nouveau/nvkm/engine/device/user.c

@@ -49,10 +49,10 @@ nvkm_udevice_info(struct nvkm_udevice *udev, void *data, u32 size)
 	union {
 		struct nv_device_info_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "device info size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "device info vers %d\n", args->v0.version);
 	} else
 		return ret;
@@ -124,13 +124,16 @@ nvkm_udevice_info(struct nvkm_udevice *udev, void *data, u32 size)
 static int
 nvkm_udevice_time(struct nvkm_udevice *udev, void *data, u32 size)
 {
+	struct nvkm_object *object = &udev->object;
 	struct nvkm_device *device = udev->device;
 	union {
 		struct nv_device_time_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	nvif_ioctl(object, "device time size %d\n", size);
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
+		nvif_ioctl(object, "device time vers %d\n", args->v0.version);
 		args->v0.time = nvkm_timer_read(device->timer);
 	}
 
@@ -141,6 +144,7 @@ static int
 nvkm_udevice_mthd(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 {
 	struct nvkm_udevice *udev = nvkm_udevice(object);
+	nvif_ioctl(object, "device mthd %08x\n", mthd);
 	switch (mthd) {
 	case NV_DEVICE_V0_INFO:
 		return nvkm_udevice_info(udev, data, size);
@@ -332,10 +336,10 @@ nvkm_udevice_new(const struct nvkm_oclass *oclass, void *data, u32 size,
 	struct nvkm_object *parent = &client->object;
 	const struct nvkm_object_func *func;
 	struct nvkm_udevice *udev;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create device size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create device v%d device %016llx\n",
 			   args->v0.version, args->v0.device);
 	} else

drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c

@@ -59,9 +59,9 @@ nvkm_disp_vblank_ctor(struct nvkm_object *object, void *data, u32 size,
 	union {
 		struct nvif_notify_head_req_v0 v0;
 	} *req = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(req->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, false))) {
 		notify->size = sizeof(struct nvif_notify_head_rep_v0);
 		if (ret = -ENXIO, req->v0.head <= disp->vblank.index_nr) {
 			notify->types = 1;
@@ -97,9 +97,9 @@ nvkm_disp_hpd_ctor(struct nvkm_object *object, void *data, u32 size,
 		struct nvif_notify_conn_req_v0 v0;
 	} *req = data;
 	struct nvkm_output *outp;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(req->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, false))) {
 		notify->size = sizeof(struct nvif_notify_conn_rep_v0);
 		list_for_each_entry(outp, &disp->outp, head) {
 			if (ret = -ENXIO, outp->conn->index == req->v0.conn) {

drivers/gpu/drm/nouveau/nvkm/engine/disp/basenv50.c

@@ -42,11 +42,11 @@ nv50_disp_base_new(const struct nv50_disp_dmac_func *func,
 	} *args = data;
 	struct nvkm_object *parent = oclass->parent;
 	struct nv50_disp *disp = root->disp;
-	int head, ret;
+	int head, ret = -ENOSYS;
 	u64 push;
 
 	nvif_ioctl(parent, "create disp base channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create disp base channel dma vers %d "
 				   "pushbuf %016llx head %d\n",
 			   args->v0.version, args->v0.pushbuf, args->v0.head);

drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c

@@ -134,9 +134,9 @@ nv50_disp_chan_uevent_ctor(struct nvkm_object *object, void *data, u32 size,
 	union {
 		struct nvif_notify_uevent_req none;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unvers(args->none)) {
+	if (!(ret = nvif_unvers(ret, &data, &size, args->none))) {
 		notify->size  = sizeof(struct nvif_notify_uevent_rep);
 		notify->types = 1;
 		notify->index = chan->chid;

drivers/gpu/drm/nouveau/nvkm/engine/disp/corenv50.c

@@ -43,10 +43,10 @@ nv50_disp_core_new(const struct nv50_disp_dmac_func *func,
 	} *args = data;
 	struct nvkm_object *parent = oclass->parent;
 	u64 push;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create disp core channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create disp core channel dma vers %d "
 				   "pushbuf %016llx\n",
 			   args->v0.version, args->v0.pushbuf);

drivers/gpu/drm/nouveau/nvkm/engine/disp/cursnv50.c

@@ -42,10 +42,10 @@ nv50_disp_curs_new(const struct nv50_disp_chan_func *func,
 	} *args = data;
 	struct nvkm_object *parent = oclass->parent;
 	struct nv50_disp *disp = root->disp;
-	int head, ret;
+	int head, ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create disp cursor size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create disp cursor vers %d head %d\n",
 			   args->v0.version, args->v0.head);
 		if (args->v0.head > disp->base.head.nr)

drivers/gpu/drm/nouveau/nvkm/engine/disp/dacnv50.c

@@ -39,10 +39,10 @@ nv50_dac_power(NV50_DISP_MTHD_V1)
 		struct nv50_disp_dac_pwr_v0 v0;
 	} *args = data;
 	u32 stat;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp dac pwr size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp dac pwr vers %d state %d data %d "
 				   "vsync %d hsync %d\n",
 			   args->v0.version, args->v0.state, args->v0.data,
@@ -76,10 +76,10 @@ nv50_dac_sense(NV50_DISP_MTHD_V1)
 	} *args = data;
 	const u32 doff = outp->or * 0x800;
 	u32 loadval;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp dac load size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp dac load vers %d data %08x\n",
 			   args->v0.version, args->v0.data);
 		if (args->v0.data & 0xfff00000)

drivers/gpu/drm/nouveau/nvkm/engine/disp/hdagf119.c

@@ -41,10 +41,10 @@ gf119_hda_eld(NV50_DISP_MTHD_V1)
 	} *args = data;
 	const u32 soff = outp->or * 0x030;
 	const u32 hoff = head * 0x800;
-	int ret, i;
+	int ret = -ENOSYS, i;
 
 	nvif_ioctl(object, "disp sor hda eld size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "disp sor hda eld vers %d\n",
 			   args->v0.version);
 		if (size > 0x60)

drivers/gpu/drm/nouveau/nvkm/engine/disp/hdagt215.c

@@ -38,10 +38,10 @@ gt215_hda_eld(NV50_DISP_MTHD_V1)
 		struct nv50_disp_sor_hda_eld_v0 v0;
 	} *args = data;
 	const u32 soff = outp->or * 0x800;
-	int ret, i;
+	int ret = -ENOSYS, i;
 
 	nvif_ioctl(object, "disp sor hda eld size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "disp sor hda eld vers %d\n",
 			   args->v0.version);
 		if (size > 0x60)

drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmig84.c

@@ -37,10 +37,10 @@ g84_hdmi_ctrl(NV50_DISP_MTHD_V1)
 		struct nv50_disp_sor_hdmi_pwr_v0 v0;
 	} *args = data;
 	u32 ctrl;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp sor hdmi ctrl size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp sor hdmi ctrl vers %d state %d "
 				   "max_ac_packet %d rekey %d\n",
 			   args->v0.version, args->v0.state,

drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmigf119.c

@@ -37,10 +37,10 @@ gf119_hdmi_ctrl(NV50_DISP_MTHD_V1)
 		struct nv50_disp_sor_hdmi_pwr_v0 v0;
 	} *args = data;
 	u32 ctrl;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp sor hdmi ctrl size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp sor hdmi ctrl vers %d state %d "
 				   "max_ac_packet %d rekey %d\n",
 			   args->v0.version, args->v0.state,

drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmigk104.c

@@ -38,10 +38,10 @@ gk104_hdmi_ctrl(NV50_DISP_MTHD_V1)
 		struct nv50_disp_sor_hdmi_pwr_v0 v0;
 	} *args = data;
 	u32 ctrl;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp sor hdmi ctrl size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp sor hdmi ctrl vers %d state %d "
 				   "max_ac_packet %d rekey %d\n",
 			   args->v0.version, args->v0.state,

drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmigt215.c

@@ -38,10 +38,10 @@ gt215_hdmi_ctrl(NV50_DISP_MTHD_V1)
 		struct nv50_disp_sor_hdmi_pwr_v0 v0;
 	} *args = data;
 	u32 ctrl;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp sor hdmi ctrl size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp sor hdmi ctrl vers %d state %d "
 				   "max_ac_packet %d rekey %d\n",
 			   args->v0.version, args->v0.state,

drivers/gpu/drm/nouveau/nvkm/engine/disp/oimmnv50.c

@@ -42,10 +42,10 @@ nv50_disp_oimm_new(const struct nv50_disp_chan_func *func,
 	} *args = data;
 	struct nvkm_object *parent = oclass->parent;
 	struct nv50_disp *disp = root->disp;
-	int head, ret;
+	int head, ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create disp overlay size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create disp overlay vers %d head %d\n",
 			   args->v0.version, args->v0.head);
 		if (args->v0.head > disp->base.head.nr)

drivers/gpu/drm/nouveau/nvkm/engine/disp/ovlynv50.c

@@ -42,11 +42,11 @@ nv50_disp_ovly_new(const struct nv50_disp_dmac_func *func,
 	} *args = data;
 	struct nvkm_object *parent = oclass->parent;
 	struct nv50_disp *disp = root->disp;
-	int head, ret;
+	int head, ret = -ENOSYS;
 	u64 push;
 
 	nvif_ioctl(parent, "create disp overlay channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create disp overlay channel dma vers %d "
 				   "pushbuf %016llx head %d\n",
 			   args->v0.version, args->v0.pushbuf, args->v0.head);

drivers/gpu/drm/nouveau/nvkm/engine/disp/piornv50.c

@@ -40,10 +40,10 @@ nv50_pior_power(NV50_DISP_MTHD_V1)
 		struct nv50_disp_pior_pwr_v0 v0;
 	} *args = data;
 	u32 ctrl, type;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp pior pwr size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp pior pwr vers %d state %d type %x\n",
 			   args->v0.version, args->v0.state, args->v0.type);
 		if (args->v0.type > 0x0f)

drivers/gpu/drm/nouveau/nvkm/engine/disp/rootgf119.c

@@ -42,10 +42,10 @@ gf119_disp_root_scanoutpos(NV50_DISP_MTHD_V0)
 	union {
 		struct nv50_disp_scanoutpos_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp scanoutpos size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp scanoutpos vers %d\n",
 			   args->v0.version);
 		args->v0.vblanke = (blanke & 0xffff0000) >> 16;

drivers/gpu/drm/nouveau/nvkm/engine/disp/rootnv04.c

@@ -46,10 +46,10 @@ nv04_disp_scanoutpos(struct nv04_disp_root *root,
 		struct nv04_disp_scanoutpos_v0 v0;
 	} *args = data;
 	u32 line;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp scanoutpos size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp scanoutpos vers %d\n",
 			   args->v0.version);
 		args->v0.vblanks = nvkm_rd32(device, 0x680800 + hoff) & 0xffff;
@@ -86,10 +86,10 @@ nv04_disp_mthd(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 	union {
 		struct nv04_disp_mthd_v0 v0;
 	} *args = data;
-	int head, ret;
+	int head, ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp mthd size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "disp mthd vers %d mthd %02x head %d\n",
 			   args->v0.version, args->v0.method, args->v0.head);
 		mthd = args->v0.method;

drivers/gpu/drm/nouveau/nvkm/engine/disp/rootnv50.c

@@ -42,10 +42,10 @@ nv50_disp_root_scanoutpos(NV50_DISP_MTHD_V0)
 	union {
 		struct nv50_disp_scanoutpos_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp scanoutpos size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp scanoutpos vers %d\n",
 			   args->v0.version);
 		args->v0.vblanke = (blanke & 0xffff0000) >> 16;
@@ -79,19 +79,19 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 	struct nvkm_output *outp = NULL;
 	struct nvkm_output *temp;
 	u16 type, mask = 0;
-	int head, ret;
+	int head, ret = -ENOSYS;
 
 	if (mthd != NV50_DISP_MTHD)
 		return -EINVAL;
 
 	nvif_ioctl(object, "disp mthd size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(object, "disp mthd vers %d mthd %02x head %d\n",
 			   args->v0.version, args->v0.method, args->v0.head);
 		mthd = args->v0.method;
 		head = args->v0.head;
 	} else
-	if (nvif_unpack(args->v1, 1, 1, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v1, 1, 1, true))) {
 		nvif_ioctl(object, "disp mthd vers %d mthd %02x "
 				   "type %04x mask %04x\n",
 			   args->v1.version, args->v1.method,
@@ -144,8 +144,9 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 		union {
 			struct nv50_disp_sor_lvds_script_v0 v0;
 		} *args = data;
+		int ret = -ENOSYS;
 		nvif_ioctl(object, "disp sor lvds script size %d\n", size);
-		if (nvif_unpack(args->v0, 0, 0, false)) {
+		if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 			nvif_ioctl(object, "disp sor lvds script "
 					   "vers %d name %04x\n",
 				   args->v0.version, args->v0.script);
@@ -160,8 +161,9 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 		union {
 			struct nv50_disp_sor_dp_pwr_v0 v0;
 		} *args = data;
+		int ret = -ENOSYS;
 		nvif_ioctl(object, "disp sor dp pwr size %d\n", size);
-		if (nvif_unpack(args->v0, 0, 0, false)) {
+		if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 			nvif_ioctl(object, "disp sor dp pwr vers %d state %d\n",
 				   args->v0.version, args->v0.state);
 			if (args->v0.state == 0) {

drivers/gpu/drm/nouveau/nvkm/engine/disp/sornv50.c

@@ -39,10 +39,10 @@ nv50_sor_power(NV50_DISP_MTHD_V1)
 	} *args = data;
 	const u32 soff = outp->or * 0x800;
 	u32 stat;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "disp sor pwr size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "disp sor pwr vers %d state %d\n",
 			   args->v0.version, args->v0.state);
 		stat = !!args->v0.state;

drivers/gpu/drm/nouveau/nvkm/engine/dma/user.c

@@ -69,7 +69,7 @@ nvkm_dmaobj_ctor(const struct nvkm_dmaobj_func *func, struct nvkm_dma *dma,
 	struct nvkm_fb *fb = device->fb;
 	void *data = *pdata;
 	u32 size = *psize;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvkm_object_ctor(&nvkm_dmaobj_func, oclass, &dmaobj->object);
 	dmaobj->func = func;
@@ -77,7 +77,7 @@ nvkm_dmaobj_ctor(const struct nvkm_dmaobj_func *func, struct nvkm_dma *dma,
 	RB_CLEAR_NODE(&dmaobj->rb);
 
 	nvif_ioctl(parent, "create dma size %d\n", *psize);
-	if (nvif_unpack(args->v0, 0, 0, true)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 		nvif_ioctl(parent, "create dma vers %d target %d access %d "
 				   "start %016llx limit %016llx\n",
 			   args->v0.version, args->v0.target, args->v0.access,

drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf100.c

@@ -87,10 +87,11 @@ gf100_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
 	if (ret)
 		return ret;
 
+	ret  = -ENOSYS;
 	args = data;
 
 	nvif_ioctl(parent, "create gf100 dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent,
 			   "create gf100 dma vers %d priv %d kind %02x\n",
 			   args->v0.version, args->v0.priv, args->v0.kind);

drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf119.c

@@ -85,10 +85,11 @@ gf119_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
 	if (ret)
 		return ret;
 
+	ret  = -ENOSYS;
 	args = data;
 
 	nvif_ioctl(parent, "create gf119 dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent,
 			   "create gf100 dma vers %d page %d kind %02x\n",
 			   args->v0.version, args->v0.page, args->v0.kind);

drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv50.c

@@ -87,10 +87,11 @@ nv50_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
 	if (ret)
 		return ret;
 
+	ret  = -ENOSYS;
 	args = data;
 
 	nvif_ioctl(parent, "create nv50 dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create nv50 dma vers %d priv %d part %d "
 				   "comp %d kind %02x\n", args->v0.version,
 			   args->v0.priv, args->v0.part, args->v0.comp,

drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c

@@ -129,9 +129,9 @@ nvkm_fifo_uevent_ctor(struct nvkm_object *object, void *data, u32 size,
 	union {
 		struct nvif_notify_uevent_req none;
 	} *req = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unvers(req->none)) {
+	if (!(ret = nvif_unvers(ret, &data, &size, req->none))) {
 		notify->size  = sizeof(struct nvif_notify_uevent_rep);
 		notify->types = 1;
 		notify->index = 0;

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmag84.c

@@ -40,10 +40,10 @@ g84_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	} *args = data;
 	struct nv50_fifo *fifo = nv50_fifo(base);
 	struct nv50_fifo_chan *chan;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel dma vers %d vm %llx "
 				   "pushbuf %llx offset %016llx\n",
 			   args->v0.version, args->v0.vm, args->v0.pushbuf,

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c

@@ -168,10 +168,10 @@ nv04_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct nv04_fifo_chan *chan = NULL;
 	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	struct nvkm_instmem *imem = device->imem;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel dma vers %d pushbuf %llx "
 				   "offset %08x\n", args->v0.version,
 			   args->v0.pushbuf, args->v0.offset);

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv10.c

@@ -44,10 +44,10 @@ nv10_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct nv04_fifo_chan *chan = NULL;
 	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	struct nvkm_instmem *imem = device->imem;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel dma vers %d pushbuf %llx "
 				   "offset %08x\n", args->v0.version,
 			   args->v0.pushbuf, args->v0.offset);

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv17.c

@@ -44,10 +44,10 @@ nv17_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct nv04_fifo_chan *chan = NULL;
 	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	struct nvkm_instmem *imem = device->imem;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel dma vers %d pushbuf %llx "
 				   "offset %08x\n", args->v0.version,
 			   args->v0.pushbuf, args->v0.offset);

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv40.c

@@ -189,10 +189,10 @@ nv40_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct nv04_fifo_chan *chan = NULL;
 	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	struct nvkm_instmem *imem = device->imem;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel dma vers %d pushbuf %llx "
 				   "offset %08x\n", args->v0.version,
 			   args->v0.pushbuf, args->v0.offset);

drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv50.c

@@ -40,10 +40,10 @@ nv50_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	} *args = data;
 	struct nv50_fifo *fifo = nv50_fifo(base);
 	struct nv50_fifo_chan *chan;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel dma vers %d vm %llx "
 				   "pushbuf %llx offset %016llx\n",
 			   args->v0.version, args->v0.vm, args->v0.pushbuf,

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifog84.c

@@ -41,10 +41,10 @@ g84_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct nv50_fifo *fifo = nv50_fifo(base);
 	struct nv50_fifo_chan *chan;
 	u64 ioffset, ilength;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel gpfifo size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel gpfifo vers %d vm %llx "
 				   "pushbuf %llx ioffset %016llx "
 				   "ilength %08x\n",

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogf100.c

@@ -200,10 +200,10 @@ gf100_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct nvkm_object *parent = oclass->parent;
 	struct gf100_fifo_chan *chan;
 	u64 usermem, ioffset, ilength;
-	int ret, i;
+	int ret = -ENOSYS, i;
 
 	nvif_ioctl(parent, "create channel gpfifo size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel gpfifo vers %d vm %llx "
 				   "ioffset %016llx ilength %08x\n",
 			   args->v0.version, args->v0.vm, args->v0.ioffset,

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c

@@ -214,10 +214,10 @@ gk104_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct gk104_fifo_chan *chan;
 	u64 usermem, ioffset, ilength;
 	u32 engines;
-	int ret, i;
+	int ret = -ENOSYS, i;
 
 	nvif_ioctl(parent, "create channel gpfifo size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel gpfifo vers %d vm %llx "
 				   "ioffset %016llx ilength %08x engine %08x\n",
 			   args->v0.version, args->v0.vm, args->v0.ioffset,

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifonv50.c

@@ -41,10 +41,10 @@ nv50_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	struct nv50_fifo *fifo = nv50_fifo(base);
 	struct nv50_fifo_chan *chan;
 	u64 ioffset, ilength;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel gpfifo size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create channel gpfifo vers %d vm %llx "
 				   "pushbuf %llx ioffset %016llx "
 				   "ilength %08x\n",

drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c

@@ -148,9 +148,9 @@ gf100_fermi_mthd_zbc_color(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct fermi_a_zbc_color_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		switch (args->v0.format) {
 		case FERMI_A_ZBC_COLOR_V0_FMT_ZERO:
 		case FERMI_A_ZBC_COLOR_V0_FMT_UNORM_ONE:
@@ -194,9 +194,9 @@ gf100_fermi_mthd_zbc_depth(struct nvkm_object *object, void *data, u32 size)
 	union {
 		struct fermi_a_zbc_depth_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		switch (args->v0.format) {
 		case FERMI_A_ZBC_DEPTH_V0_FMT_FP32:
 			ret = gf100_gr_zbc_depth_get(gr, args->v0.format,
@@ -214,6 +214,7 @@ gf100_fermi_mthd_zbc_depth(struct nvkm_object *object, void *data, u32 size)
 static int
 gf100_fermi_mthd(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 {
+	nvif_ioctl(object, "fermi mthd %08x\n", mthd);
 	switch (mthd) {
 	case FERMI_A_ZBC_COLOR:
 		return gf100_fermi_mthd_zbc_color(object, data, size);

drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c

@@ -212,10 +212,10 @@ nvkm_perfdom_init(struct nvkm_perfdom *dom, void *data, u32 size)
 	} *args = data;
 	struct nvkm_object *object = &dom->object;
 	struct nvkm_pm *pm = dom->perfmon->pm;
-	int ret, i;
+	int ret = -ENOSYS, i;
 
 	nvif_ioctl(object, "perfdom init size %d\n", size);
-	if (nvif_unvers(args->none)) {
+	if (!(ret = nvif_unvers(ret, &data, &size, args->none))) {
 		nvif_ioctl(object, "perfdom init\n");
 	} else
 		return ret;
@@ -242,10 +242,10 @@ nvkm_perfdom_sample(struct nvkm_perfdom *dom, void *data, u32 size)
 	} *args = data;
 	struct nvkm_object *object = &dom->object;
 	struct nvkm_pm *pm = dom->perfmon->pm;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(object, "perfdom sample size %d\n", size);
-	if (nvif_unvers(args->none)) {
+	if (!(ret = nvif_unvers(ret, &data, &size, args->none))) {
 		nvif_ioctl(object, "perfdom sample\n");
 	} else
 		return ret;
@@ -266,10 +266,10 @@ nvkm_perfdom_read(struct nvkm_perfdom *dom, void *data, u32 size)
 	} *args = data;
 	struct nvkm_object *object = &dom->object;
 	struct nvkm_pm *pm = dom->perfmon->pm;
-	int ret, i;
+	int ret = -ENOSYS, i;
 
 	nvif_ioctl(object, "perfdom read size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "perfdom read vers %d\n", args->v0.version);
 	} else
 		return ret;
@@ -376,10 +376,10 @@ nvkm_perfdom_new_(struct nvkm_perfmon *perfmon,
 	struct nvkm_perfctr *ctr[4] = {};
 	struct nvkm_perfdom *dom;
 	int c, s, m;
-	int ret;
+	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create perfdom size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(parent, "create perfdom vers %d dom %d mode %02x\n",
 			   args->v0.version, args->v0.domain, args->v0.mode);
 	} else
@@ -441,10 +441,10 @@ nvkm_perfmon_mthd_query_domain(struct nvkm_perfmon *perfmon,
 	struct nvkm_pm *pm = perfmon->pm;
 	struct nvkm_perfdom *dom;
 	u8 domain_nr;
-	int di, ret;
+	int di, ret = -ENOSYS;
 
 	nvif_ioctl(object, "perfmon query domain size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object, "perfmon domain vers %d iter %02x\n",
 			   args->v0.version, args->v0.iter);
 		di = (args->v0.iter & 0xff) - 1;
@@ -492,10 +492,10 @@ nvkm_perfmon_mthd_query_signal(struct nvkm_perfmon *perfmon,
 	struct nvkm_perfsig *sig;
 	const bool all = nvkm_boolopt(device->cfgopt, "NvPmShowAll", false);
 	const bool raw = nvkm_boolopt(device->cfgopt, "NvPmUnnamed", all);
-	int ret, si;
+	int ret = -ENOSYS, si;
 
 	nvif_ioctl(object, "perfmon query signal size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object,
 			   "perfmon query signal vers %d dom %d iter %04x\n",
 			   args->v0.version, args->v0.domain, args->v0.iter);
@@ -545,10 +545,10 @@ nvkm_perfmon_mthd_query_source(struct nvkm_perfmon *perfmon,
 	struct nvkm_perfsig *sig;
 	struct nvkm_perfsrc *src;
 	u8 source_nr = 0;
-	int si, ret;
+	int si, ret = -ENOSYS;
 
 	nvif_ioctl(object, "perfmon query source size %d\n", size);
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		nvif_ioctl(object,
 			   "perfmon source vers %d dom %d sig %02x iter %02x\n",
 			   args->v0.version, args->v0.domain, args->v0.signal,

drivers/gpu/drm/nouveau/nvkm/engine/sw/chan.c

@@ -53,9 +53,9 @@ nvkm_sw_chan_event_ctor(struct nvkm_object *object, void *data, u32 size,
 	union {
 		struct nvif_notify_uevent_req none;
 	} *req = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unvers(req->none)) {
+	if (!(ret = nvif_unvers(ret, &data, &size, req->none))) {
 		notify->size  = sizeof(struct nvif_notify_uevent_rep);
 		notify->types = 1;
 		notify->index = 0;

drivers/gpu/drm/nouveau/nvkm/engine/sw/nv04.c

@@ -47,9 +47,9 @@ nv04_nvsw_mthd_get_ref(struct nvkm_nvsw *nvsw, void *data, u32 size)
 	union {
 		struct nv04_nvsw_get_ref_v0 v0;
 	} *args = data;
-	int ret;
+	int ret = -ENOSYS;
 
-	if (nvif_unpack(args->v0, 0, 0, false)) {
+	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 		args->v0.ref = atomic_read(&chan->ref);
 	}