mei: always initialize the callback with the intended operation type

We set the operation type at initialization time as each cb is used only
for a single type of operation

As a byproduct we add a convenient wrapper for allocating cb with
the data buffer.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/amthif.c

@@ -254,7 +254,7 @@ static int mei_amthif_read_start(struct mei_cl *cl, struct file *file)
 	size_t length = dev->iamthif_mtu;
 	int rets;
 
-	cb = mei_io_cb_init(cl, file);
+	cb = mei_io_cb_init(cl, MEI_FOP_READ, file);
 	if (!cb) {
 		rets = -ENOMEM;
 		goto err;
@@ -264,7 +264,6 @@ static int mei_amthif_read_start(struct mei_cl *cl, struct file *file)
 	if (rets)
 		goto err;
 
-	cb->fop_type = MEI_FOP_READ;
 	list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
 
 	dev->iamthif_state = MEI_IAMTHIF_READING;
@@ -359,7 +358,6 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
 
 	dev = cl->dev;
 
-	cb->fop_type = MEI_FOP_WRITE;
 	list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
 	return mei_amthif_run_next_cmd(dev);
 }

drivers/misc/mei/bus.c

@@ -255,16 +255,12 @@ static ssize_t ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
 		goto out;
 	}
 
-	cb = mei_io_cb_init(cl, NULL);
+	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
 	if (!cb) {
 		rets = -ENOMEM;
 		goto out;
 	}
 
-	rets = mei_io_cb_alloc_buf(cb, length);
-	if (rets < 0)
-		goto out;
-
 	memcpy(cb->buf.data, buf, length);
 
 	rets = mei_cl_write(cl, cb, blocking);
@@ -293,7 +289,7 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
 	mutex_lock(&dev->device_lock);
 
 	if (!cl->read_cb) {
-		rets = mei_cl_read_start(cl, length);
+		rets = mei_cl_read_start(cl, length, NULL);
 		if (rets < 0)
 			goto out;
 	}
@@ -392,7 +388,7 @@ static void mei_bus_event_work(struct work_struct *work)
 	device->events = 0;
 
 	/* Prepare for the next read */
-	mei_cl_read_start(device->cl, 0);
+	mei_cl_read_start(device->cl, 0, NULL);
 }
 
 int mei_cl_register_event_cb(struct mei_cl_device *device,
@@ -406,7 +402,7 @@ int mei_cl_register_event_cb(struct mei_cl_device *device,
 	device->event_context = context;
 	INIT_WORK(&device->event_work, mei_bus_event_work);
 
-	mei_cl_read_start(device->cl, 0);
+	mei_cl_read_start(device->cl, 0, NULL);
 
 	return 0;
 }
@@ -448,7 +444,7 @@ int mei_cl_enable_device(struct mei_cl_device *device)
 	mutex_unlock(&dev->device_lock);
 
 	if (device->event_cb && !cl->read_cb)
-		mei_cl_read_start(device->cl, 0);
+		mei_cl_read_start(device->cl, 0, NULL);
 
 	if (!device->ops || !device->ops->enable)
 		return 0;

drivers/misc/mei/client.c

@@ -384,11 +384,13 @@ void mei_io_cb_free(struct mei_cl_cb *cb)
  * mei_io_cb_init - allocate and initialize io callback
  *
  * @cl: mei client
+ * @type: operation type
  * @fp: pointer to file structure
  *
  * Return: mei_cl_cb pointer or NULL;
  */
-struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp)
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
+				 struct file *fp)
 {
 	struct mei_cl_cb *cb;
 
@@ -401,6 +403,7 @@ struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp)
 	cb->file_object = fp;
 	cb->cl = cl;
 	cb->buf_idx = 0;
+	cb->fop_type = type;
 	return cb;
 }
 
@@ -429,6 +432,33 @@ int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length)
 	return 0;
 }
 
+/**
+ * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
+ *
+ * @cl: host client
+ * @length: size of the buffer
+ * @type: operation type
+ * @fp: associated file pointer (might be NULL)
+ *
+ * Return: cb on success and NULL on failure
+ */
+struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
+				  enum mei_cb_file_ops type, struct file *fp)
+{
+	struct mei_cl_cb *cb;
+
+	cb = mei_io_cb_init(cl, type, fp);
+	if (!cb)
+		return NULL;
+
+	if (mei_io_cb_alloc_buf(cb, length)) {
+		mei_io_cb_free(cb);
+		return NULL;
+	}
+
+	return cb;
+}
+
 /**
  * mei_cl_flush_queues - flushes queue lists belonging to cl.
  *
@@ -688,13 +718,10 @@ int mei_cl_disconnect(struct mei_cl *cl)
 		return rets;
 	}
 
-	cb = mei_io_cb_init(cl, NULL);
-	if (!cb) {
-		rets = -ENOMEM;
+	cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL);
+	rets = cb ? 0 : -ENOMEM;
+	if (rets)
 		goto free;
-	}
-
-	cb->fop_type = MEI_FOP_DISCONNECT;
 
 	if (mei_hbuf_acquire(dev)) {
 		if (mei_hbm_cl_disconnect_req(dev, cl)) {
@@ -795,13 +822,10 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
 		return rets;
 	}
 
-	cb = mei_io_cb_init(cl, file);
-	if (!cb) {
-		rets = -ENOMEM;
+	cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file);
+	rets = cb ? 0 : -ENOMEM;
+	if (rets)
 		goto out;
-	}
-
-	cb->fop_type = MEI_FOP_CONNECT;
 
 	/* run hbuf acquire last so we don't have to undo */
 	if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
@@ -934,10 +958,11 @@ out:
  *
  * @cl: host client
  * @length: number of bytes to read
+ * @fp: pointer to file structure
  *
  * Return: 0 on success, <0 on failure.
  */
-int mei_cl_read_start(struct mei_cl *cl, size_t length)
+int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp)
 {
 	struct mei_device *dev;
 	struct mei_cl_cb *cb;
@@ -972,17 +997,11 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 		return rets;
 	}
 
-	cb = mei_io_cb_init(cl, NULL);
-	if (!cb) {
-		rets = -ENOMEM;
-		goto out;
-	}
-
-	rets = mei_io_cb_alloc_buf(cb, length);
+	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp);
+	rets = cb ? 0 : -ENOMEM;
 	if (rets)
 		goto out;
 
-	cb->fop_type = MEI_FOP_READ;
 	if (mei_hbuf_acquire(dev)) {
 		rets = mei_hbm_cl_flow_control_req(dev, cl);
 		if (rets < 0)
@@ -1128,7 +1147,6 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 		return rets;
 	}
 
-	cb->fop_type = MEI_FOP_WRITE;
 	cb->buf_idx = 0;
 	cl->writing_state = MEI_IDLE;
 

drivers/misc/mei/client.h

@@ -47,7 +47,8 @@ void mei_me_cl_rm_all(struct mei_device *dev);
 /*
  * MEI IO Functions
  */
-struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp);
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
+				 struct file *fp);
 void mei_io_cb_free(struct mei_cl_cb *priv_cb);
 int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length);
 
@@ -77,6 +78,8 @@ int mei_cl_unlink(struct mei_cl *cl);
 int mei_cl_flush_queues(struct mei_cl *cl);
 struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl);
 
+struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
+				  enum mei_cb_file_ops type, struct file *fp);
 
 int mei_cl_flow_ctrl_creds(struct mei_cl *cl);
 
@@ -100,7 +103,7 @@ static inline bool mei_cl_is_transitioning(struct mei_cl *cl)
 bool mei_cl_is_other_connecting(struct mei_cl *cl);
 int mei_cl_disconnect(struct mei_cl *cl);
 int mei_cl_connect(struct mei_cl *cl, struct file *file);
-int mei_cl_read_start(struct mei_cl *cl, size_t length);
+int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp);
 int mei_cl_irq_read_msg(struct mei_cl *cl, struct mei_msg_hdr *hdr,
 			struct mei_cl_cb *cmpl_list);
 int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking);

drivers/misc/mei/hbm.c

@@ -684,10 +684,9 @@ static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 		cl->state = MEI_FILE_DISCONNECTED;
 		cl->timer_count = 0;
 
-		cb = mei_io_cb_init(cl, NULL);
+		cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT_RSP, NULL);
 		if (!cb)
 			return -ENOMEM;
-		cb->fop_type = MEI_FOP_DISCONNECT_RSP;
 		cl_dbg(dev, cl, "add disconnect response as first\n");
 		list_add(&cb->list, &dev->ctrl_wr_list.list);
 	}

drivers/misc/mei/main.c

@@ -209,7 +209,7 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 		*offset = 0;
 	}
 
-	err = mei_cl_read_start(cl, length);
+	err = mei_cl_read_start(cl, length, file);
 	if (err && err != -EBUSY) {
 		dev_dbg(dev->dev,
 			"mei start read failure with status = %d\n", err);
@@ -383,15 +383,11 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 	} else if (cl->reading_state == MEI_IDLE)
 		*offset = 0;
 
-
-	write_cb = mei_io_cb_init(cl, file);
+	write_cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
 	if (!write_cb) {
 		rets = -ENOMEM;
 		goto out;
 	}
-	rets = mei_io_cb_alloc_buf(write_cb, length);
-	if (rets)
-		goto out;
 
 	rets = copy_from_user(write_cb->buf.data, ubuf, length);
 	if (rets) {