staging: fsl-mc: remove debug WARN_ONs doubling error checks

A lot of error checks are doubled by debug WARN_ONs. Given that the
driver was thoroughly debugged and is in a stable state, it's time to
drop them.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/dprc-driver.c

@@ -382,11 +382,11 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
 	dev_dbg(dev, "DPRC IRQ %d triggered on CPU %u\n",
 		irq_num, smp_processor_id());
 
-	if (WARN_ON(!(mc_dev->flags & FSL_MC_IS_DPRC)))
+	if (!(mc_dev->flags & FSL_MC_IS_DPRC))
 		return IRQ_HANDLED;
 
 	mutex_lock(&mc_bus->scan_mutex);
-	if (WARN_ON(!msi_desc || msi_desc->irq != (u32)irq_num))
+	if (!msi_desc || msi_desc->irq != (u32)irq_num)
 		goto out;
 
 	status = 0;
@@ -593,20 +593,20 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)
 	bool msi_domain_set = false;
 	u16 major_ver, minor_ver;
 
-	if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+	if (strcmp(mc_dev->obj_desc.type, "dprc") != 0)
 		return -EINVAL;
 
-	if (WARN_ON(dev_get_msi_domain(&mc_dev->dev)))
+	if (dev_get_msi_domain(&mc_dev->dev))
 		return -EINVAL;
 
 	if (!mc_dev->mc_io) {
 		/*
 		 * This is a child DPRC:
 		 */
-		if (WARN_ON(!dev_is_fsl_mc(parent_dev)))
+		if (!dev_is_fsl_mc(parent_dev))
 			return -EINVAL;
 
-		if (WARN_ON(mc_dev->obj_desc.region_count == 0))
+		if (mc_dev->obj_desc.region_count == 0)
 			return -EINVAL;
 
 		region_size = resource_size(mc_dev->regions);
@@ -634,7 +634,7 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)
 		 */
 		struct irq_domain *mc_msi_domain;
 
-		if (WARN_ON(dev_is_fsl_mc(parent_dev)))
+		if (dev_is_fsl_mc(parent_dev))
 			return -EINVAL;
 
 		error = fsl_mc_find_msi_domain(parent_dev,
@@ -745,12 +745,12 @@ static int dprc_remove(struct fsl_mc_device *mc_dev)
 	int error;
 	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
 
-	if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+	if (strcmp(mc_dev->obj_desc.type, "dprc") != 0)
 		return -EINVAL;
-	if (WARN_ON(!mc_dev->mc_io))
+	if (!mc_dev->mc_io)
 		return -EINVAL;
 
-	if (WARN_ON(!mc_bus->irq_resources))
+	if (!mc_bus->irq_resources)
 		return -EINVAL;
 
 	if (dev_get_msi_domain(&mc_dev->dev))

drivers/staging/fsl-mc/bus/fsl-mc-allocator.c

@@ -41,25 +41,25 @@ static int __must_check fsl_mc_resource_pool_add_device(struct fsl_mc_bus
 	struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
 	int error = -EINVAL;
 
-	if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
+	if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES)
 		goto out;
-	if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+	if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
 		goto out;
-	if (WARN_ON(mc_dev->resource))
+	if (mc_dev->resource)
 		goto out;
 
 	res_pool = &mc_bus->resource_pools[pool_type];
-	if (WARN_ON(res_pool->type != pool_type))
+	if (res_pool->type != pool_type)
 		goto out;
-	if (WARN_ON(res_pool->mc_bus != mc_bus))
+	if (res_pool->mc_bus != mc_bus)
 		goto out;
 
 	mutex_lock(&res_pool->mutex);
 
-	if (WARN_ON(res_pool->max_count < 0))
+	if (res_pool->max_count < 0)
 		goto out_unlock;
-	if (WARN_ON(res_pool->free_count < 0 ||
-		    res_pool->free_count > res_pool->max_count))
+	if (res_pool->free_count < 0 ||
+	    res_pool->free_count > res_pool->max_count)
 		goto out_unlock;
 
 	resource = devm_kzalloc(&mc_bus_dev->dev, sizeof(*resource),
@@ -105,25 +105,25 @@ static int __must_check fsl_mc_resource_pool_remove_device(struct fsl_mc_device
 	struct fsl_mc_resource *resource;
 	int error = -EINVAL;
 
-	if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+	if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
 		goto out;
 
 	resource = mc_dev->resource;
-	if (WARN_ON(!resource || resource->data != mc_dev))
+	if (!resource || resource->data != mc_dev)
 		goto out;
 
 	mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
 	mc_bus = to_fsl_mc_bus(mc_bus_dev);
 	res_pool = resource->parent_pool;
-	if (WARN_ON(res_pool != &mc_bus->resource_pools[resource->type]))
+	if (res_pool != &mc_bus->resource_pools[resource->type])
 		goto out;
 
 	mutex_lock(&res_pool->mutex);
 
-	if (WARN_ON(res_pool->max_count <= 0))
+	if (res_pool->max_count <= 0)
 		goto out_unlock;
-	if (WARN_ON(res_pool->free_count <= 0 ||
-		    res_pool->free_count > res_pool->max_count))
+	if (res_pool->free_count <= 0 ||
+	    res_pool->free_count > res_pool->max_count)
 		goto out_unlock;
 
 	/*
@@ -187,11 +187,11 @@ int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus,
 		     FSL_MC_NUM_POOL_TYPES);
 
 	*new_resource = NULL;
-	if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
+	if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES)
 		goto out;
 
 	res_pool = &mc_bus->resource_pools[pool_type];
-	if (WARN_ON(res_pool->mc_bus != mc_bus))
+	if (res_pool->mc_bus != mc_bus)
 		goto out;
 
 	mutex_lock(&res_pool->mutex);
@@ -206,12 +206,12 @@ int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus,
 		goto out_unlock;
 	}
 
-	if (WARN_ON(resource->type != pool_type))
+	if (resource->type != pool_type)
 		goto out_unlock;
-	if (WARN_ON(resource->parent_pool != res_pool))
+	if (resource->parent_pool != res_pool)
 		goto out_unlock;
-	if (WARN_ON(res_pool->free_count <= 0 ||
-		    res_pool->free_count > res_pool->max_count))
+	if (res_pool->free_count <= 0 ||
+	    res_pool->free_count > res_pool->max_count)
 		goto out_unlock;
 
 	list_del_init(&resource->node);
@@ -231,15 +231,15 @@ void fsl_mc_resource_free(struct fsl_mc_resource *resource)
 	struct fsl_mc_resource_pool *res_pool;
 
 	res_pool = resource->parent_pool;
-	if (WARN_ON(resource->type != res_pool->type))
+	if (resource->type != res_pool->type)
 		return;
 
 	mutex_lock(&res_pool->mutex);
-	if (WARN_ON(res_pool->free_count < 0 ||
-		    res_pool->free_count >= res_pool->max_count))
+	if (res_pool->free_count < 0 ||
+	    res_pool->free_count >= res_pool->max_count)
 		goto out_unlock;
 
-	if (WARN_ON(!list_empty(&resource->node)))
+	if (!list_empty(&resource->node))
 		goto out_unlock;
 
 	list_add_tail(&resource->node, &res_pool->free_list);
@@ -278,13 +278,13 @@ int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
 	struct fsl_mc_resource *resource = NULL;
 
 	*new_mc_adev = NULL;
-	if (WARN_ON(mc_dev->flags & FSL_MC_IS_DPRC))
+	if (mc_dev->flags & FSL_MC_IS_DPRC)
 		goto error;
 
-	if (WARN_ON(!dev_is_fsl_mc(mc_dev->dev.parent)))
+	if (!dev_is_fsl_mc(mc_dev->dev.parent))
 		goto error;
 
-	if (WARN_ON(pool_type == FSL_MC_POOL_DPMCP))
+	if (pool_type == FSL_MC_POOL_DPMCP)
 		goto error;
 
 	mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
@@ -294,7 +294,7 @@ int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
 		goto error;
 
 	mc_adev = resource->data;
-	if (WARN_ON(!mc_adev))
+	if (!mc_adev)
 		goto error;
 
 	*new_mc_adev = mc_adev;
@@ -317,9 +317,9 @@ void fsl_mc_object_free(struct fsl_mc_device *mc_adev)
 	struct fsl_mc_resource *resource;
 
 	resource = mc_adev->resource;
-	if (WARN_ON(resource->type == FSL_MC_POOL_DPMCP))
+	if (resource->type == FSL_MC_POOL_DPMCP)
 		return;
-	if (WARN_ON(resource->data != mc_adev))
+	if (resource->data != mc_adev)
 		return;
 
 	fsl_mc_resource_free(resource);
@@ -348,8 +348,8 @@ int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
 	struct fsl_mc_resource_pool *res_pool =
 			&mc_bus->resource_pools[FSL_MC_POOL_IRQ];
 
-	if (WARN_ON(irq_count == 0 ||
-		    irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS))
+	if (irq_count == 0 ||
+	    irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS)
 		return -EINVAL;
 
 	error = fsl_mc_msi_domain_alloc_irqs(&mc_bus_dev->dev, irq_count);
@@ -405,13 +405,13 @@ void fsl_mc_cleanup_irq_pool(struct fsl_mc_bus *mc_bus)
 	struct fsl_mc_resource_pool *res_pool =
 			&mc_bus->resource_pools[FSL_MC_POOL_IRQ];
 
-	if (WARN_ON(!mc_bus->irq_resources))
+	if (!mc_bus->irq_resources)
 		return;
 
-	if (WARN_ON(res_pool->max_count == 0))
+	if (res_pool->max_count == 0)
 		return;
 
-	if (WARN_ON(res_pool->free_count != res_pool->max_count))
+	if (res_pool->free_count != res_pool->max_count)
 		return;
 
 	INIT_LIST_HEAD(&res_pool->free_list);
@@ -435,11 +435,11 @@ int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev)
 	struct fsl_mc_bus *mc_bus;
 	struct fsl_mc_resource_pool *res_pool;
 
-	if (WARN_ON(mc_dev->irqs))
+	if (mc_dev->irqs)
 		return -EINVAL;
 
 	irq_count = mc_dev->obj_desc.irq_count;
-	if (WARN_ON(irq_count == 0))
+	if (irq_count == 0)
 		return -EINVAL;
 
 	if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
@@ -447,7 +447,7 @@ int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev)
 	else
 		mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent));
 
-	if (WARN_ON(!mc_bus->irq_resources))
+	if (!mc_bus->irq_resources)
 		return -EINVAL;
 
 	res_pool = &mc_bus->resource_pools[FSL_MC_POOL_IRQ];
@@ -500,7 +500,7 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev)
 	struct fsl_mc_bus *mc_bus;
 	struct fsl_mc_device_irq **irqs = mc_dev->irqs;
 
-	if (WARN_ON(!irqs))
+	if (!irqs)
 		return;
 
 	irq_count = mc_dev->obj_desc.irq_count;
@@ -510,7 +510,7 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev)
 	else
 		mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent));
 
-	if (WARN_ON(!mc_bus->irq_resources))
+	if (!mc_bus->irq_resources)
 		return;
 
 	for (i = 0; i < irq_count; i++) {
@@ -575,11 +575,11 @@ static int fsl_mc_allocator_probe(struct fsl_mc_device *mc_dev)
 	struct fsl_mc_bus *mc_bus;
 	int error;
 
-	if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+	if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
 		return -EINVAL;
 
 	mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
-	if (WARN_ON(!dev_is_fsl_mc(&mc_bus_dev->dev)))
+	if (!dev_is_fsl_mc(&mc_bus_dev->dev))
 		return -EINVAL;
 
 	mc_bus = to_fsl_mc_bus(mc_bus_dev);
@@ -604,7 +604,7 @@ static int fsl_mc_allocator_remove(struct fsl_mc_device *mc_dev)
 {
 	int error;
 
-	if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
+	if (!fsl_mc_is_allocatable(mc_dev->obj_desc.type))
 		return -EINVAL;
 
 	if (mc_dev->resource) {

drivers/staging/fsl-mc/bus/fsl-mc-bus.c

@@ -284,9 +284,9 @@ static int mc_get_version(struct fsl_mc_io *mc_io,
 static void fsl_mc_get_root_dprc(struct device *dev,
 				 struct device **root_dprc_dev)
 {
-	if (WARN_ON(!dev)) {
+	if (!dev) {
 		*root_dprc_dev = NULL;
-	} else if (WARN_ON(!dev_is_fsl_mc(dev))) {
+	} else if (!dev_is_fsl_mc(dev)) {
 		*root_dprc_dev = NULL;
 	} else {
 		*root_dprc_dev = dev;
@@ -532,7 +532,7 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
 			/*
 			 * device being added is the root DPRC device
 			 */
-			if (WARN_ON(!mc_io)) {
+			if (!mc_io) {
 				error = -EINVAL;
 				goto error_cleanup_dev;
 			}
@@ -814,7 +814,7 @@ static int fsl_mc_bus_remove(struct platform_device *pdev)
 {
 	struct fsl_mc *mc = platform_get_drvdata(pdev);
 
-	if (WARN_ON(!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev)))
+	if (!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev))
 		return -EINVAL;
 
 	fsl_mc_device_remove(mc->root_mc_bus_dev);

drivers/staging/fsl-mc/bus/fsl-mc-msi.c

@@ -47,7 +47,7 @@ static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)
 {
 	struct msi_domain_ops *ops = info->ops;
 
-	if (WARN_ON(!ops))
+	if (!ops)
 		return;
 
 	/*
@@ -73,7 +73,7 @@ static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev,
 	if (msi_desc->msg.address_lo == 0x0 && msi_desc->msg.address_hi == 0x0)
 		return;
 
-	if (WARN_ON(!owner_mc_dev))
+	if (!owner_mc_dev)
 		return;
 
 	irq_cfg.paddr = ((u64)msi_desc->msg.address_hi << 32) |
@@ -136,7 +136,7 @@ static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
 {
 	struct irq_chip *chip = info->chip;
 
-	if (WARN_ON(!chip))
+	if (!chip)
 		return;
 
 	/*
@@ -238,7 +238,7 @@ int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
 	struct irq_domain *msi_domain;
 	int error;
 
-	if (WARN_ON(!list_empty(dev_to_msi_list(dev))))
+	if (!list_empty(dev_to_msi_list(dev)))
 		return -EINVAL;
 
 	error = fsl_mc_msi_alloc_descs(dev, irq_count);
@@ -246,7 +246,7 @@ int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
 		return error;
 
 	msi_domain = dev_get_msi_domain(dev);
-	if (WARN_ON(!msi_domain)) {
+	if (!msi_domain) {
 		error = -EINVAL;
 		goto cleanup_msi_descs;
 	}
@@ -274,12 +274,12 @@ void fsl_mc_msi_domain_free_irqs(struct device *dev)
 	struct irq_domain *msi_domain;
 
 	msi_domain = dev_get_msi_domain(dev);
-	if (WARN_ON(!msi_domain))
+	if (!msi_domain)
 		return;
 
 	msi_domain_free_irqs(msi_domain, dev);
 
-	if (WARN_ON(list_empty(dev_to_msi_list(dev))))
+	if (list_empty(dev_to_msi_list(dev)))
 		return;
 
 	fsl_mc_msi_free_descs(dev);

drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c

@@ -32,11 +32,11 @@ static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
 	struct fsl_mc_device *mc_bus_dev;
 	struct msi_domain_info *msi_info;
 
-	if (WARN_ON(!dev_is_fsl_mc(dev)))
+	if (!dev_is_fsl_mc(dev))
 		return -EINVAL;
 
 	mc_bus_dev = to_fsl_mc_device(dev);
-	if (WARN_ON(!(mc_bus_dev->flags & FSL_MC_IS_DPRC)))
+	if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
 		return -EINVAL;
 
 	/*

drivers/staging/fsl-mc/bus/mc-io.c

@@ -42,13 +42,10 @@ static int fsl_mc_io_set_dpmcp(struct fsl_mc_io *mc_io,
 {
 	int error;
 
-	if (WARN_ON(!dpmcp_dev))
+	if (mc_io->dpmcp_dev)
 		return -EINVAL;
 
-	if (WARN_ON(mc_io->dpmcp_dev))
-		return -EINVAL;
-
-	if (WARN_ON(dpmcp_dev->mc_io))
+	if (dpmcp_dev->mc_io)
 		return -EINVAL;
 
 	error = dpmcp_open(mc_io,
@@ -204,7 +201,7 @@ int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
 	if (mc_dev->flags & FSL_MC_IS_DPRC) {
 		mc_bus_dev = mc_dev;
 	} else {
-		if (WARN_ON(!dev_is_fsl_mc(mc_dev->dev.parent)))
+		if (!dev_is_fsl_mc(mc_dev->dev.parent))
 			return error;
 
 		mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
@@ -267,10 +264,10 @@ void fsl_mc_portal_free(struct fsl_mc_io *mc_io)
 	dpmcp_dev = mc_io->dpmcp_dev;
 
 	resource = dpmcp_dev->resource;
-	if (WARN_ON(!resource || resource->type != FSL_MC_POOL_DPMCP))
+	if (!resource || resource->type != FSL_MC_POOL_DPMCP)
 		return;
 
-	if (WARN_ON(resource->data != dpmcp_dev))
+	if (resource->data != dpmcp_dev)
 		return;
 
 	fsl_destroy_mc_io(mc_io);

drivers/staging/fsl-mc/bus/mc-sys.c

@@ -85,7 +85,7 @@ static int mc_status_to_error(enum mc_cmd_status status)
 		[MC_CMD_STATUS_INVALID_STATE] = -ENODEV,
 	};
 
-	if (WARN_ON((u32)status >= ARRAY_SIZE(mc_status_to_error_map)))
+	if ((u32)status >= ARRAY_SIZE(mc_status_to_error_map))
 		return -EINVAL;
 
 	return mc_status_to_error_map[status];
@@ -273,8 +273,7 @@ int mc_send_command(struct fsl_mc_io *mc_io, struct mc_command *cmd)
 	enum mc_cmd_status status;
 	unsigned long irq_flags = 0;
 
-	if (WARN_ON(in_irq() &&
-		    !(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)))
+	if (in_irq() && !(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL))
 		return -EINVAL;
 
 	if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)