staging: fsl-mc: get rid of mutex_locked variables
Remove mutex_locked variables which are used to determine whether mutex is
locked, instead add another label to unlock mutex on premature exits due to
an error.
This patch also addresses the folowing warnings reported by coccinelle:
drivers/staging/fsl-mc/bus/mc-allocator.c:237:1-7: preceding lock on line 204
drivers/staging/fsl-mc/bus/mc-allocator.c:89:1-7: preceding lock on line 57
drivers/staging/fsl-mc/bus/mc-allocator.c:157:1-7: preceding lock on line 124
Signed-off-by: Cihangir Akturk <cakturk@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/fsl-mc/bus/mc-allocator.c b/drivers/staging/fsl-mc/bus/mc-allocator.c
index 86f8543..bdb4b0e 100644
--- a/drivers/staging/fsl-mc/bus/mc-allocator.c
+++ b/drivers/staging/fsl-mc/bus/mc-allocator.c
@@ -39,7 +39,6 @@
struct fsl_mc_resource *resource;
struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
int error = -EINVAL;
- bool mutex_locked = false;
if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
goto out;
@@ -55,13 +54,12 @@
goto out;
mutex_lock(&res_pool->mutex);
- mutex_locked = true;
if (WARN_ON(res_pool->max_count < 0))
- goto out;
+ goto out_unlock;
if (WARN_ON(res_pool->free_count < 0 ||
res_pool->free_count > res_pool->max_count))
- goto out;
+ goto out_unlock;
resource = devm_kzalloc(&mc_bus_dev->dev, sizeof(*resource),
GFP_KERNEL);
@@ -69,7 +67,7 @@
error = -ENOMEM;
dev_err(&mc_bus_dev->dev,
"Failed to allocate memory for fsl_mc_resource\n");
- goto out;
+ goto out_unlock;
}
resource->type = pool_type;
@@ -82,10 +80,9 @@
res_pool->free_count++;
res_pool->max_count++;
error = 0;
+out_unlock:
+ mutex_unlock(&res_pool->mutex);
out:
- if (mutex_locked)
- mutex_unlock(&res_pool->mutex);
-
return error;
}
@@ -106,7 +103,6 @@
struct fsl_mc_resource_pool *res_pool;
struct fsl_mc_resource *resource;
int error = -EINVAL;
- bool mutex_locked = false;
if (WARN_ON(!FSL_MC_IS_ALLOCATABLE(mc_dev->obj_desc.type)))
goto out;
@@ -122,13 +118,12 @@
goto out;
mutex_lock(&res_pool->mutex);
- mutex_locked = true;
if (WARN_ON(res_pool->max_count <= 0))
- goto out;
+ goto out_unlock;
if (WARN_ON(res_pool->free_count <= 0 ||
res_pool->free_count > res_pool->max_count))
- goto out;
+ goto out_unlock;
/*
* If the device is currently allocated, its resource is not
@@ -139,7 +134,7 @@
dev_err(&mc_bus_dev->dev,
"Device %s cannot be removed from resource pool\n",
dev_name(&mc_dev->dev));
- goto out;
+ goto out_unlock;
}
list_del(&resource->node);
@@ -150,10 +145,9 @@
devm_kfree(&mc_bus_dev->dev, resource);
mc_dev->resource = NULL;
error = 0;
+out_unlock:
+ mutex_unlock(&res_pool->mutex);
out:
- if (mutex_locked)
- mutex_unlock(&res_pool->mutex);
-
return error;
}
@@ -188,21 +182,19 @@
struct fsl_mc_resource *resource;
struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
int error = -EINVAL;
- bool mutex_locked = false;
BUILD_BUG_ON(ARRAY_SIZE(fsl_mc_pool_type_strings) !=
FSL_MC_NUM_POOL_TYPES);
*new_resource = NULL;
if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
- goto error;
+ goto out;
res_pool = &mc_bus->resource_pools[pool_type];
if (WARN_ON(res_pool->mc_bus != mc_bus))
- goto error;
+ goto out;
mutex_lock(&res_pool->mutex);
- mutex_locked = true;
resource = list_first_entry_or_null(&res_pool->free_list,
struct fsl_mc_resource, node);
@@ -212,28 +204,26 @@
dev_err(&mc_bus_dev->dev,
"No more resources of type %s left\n",
fsl_mc_pool_type_strings[pool_type]);
- goto error;
+ goto out_unlock;
}
if (WARN_ON(resource->type != pool_type))
- goto error;
+ goto out_unlock;
if (WARN_ON(resource->parent_pool != res_pool))
- goto error;
+ goto out_unlock;
if (WARN_ON(res_pool->free_count <= 0 ||
res_pool->free_count > res_pool->max_count))
- goto error;
+ goto out_unlock;
list_del(&resource->node);
INIT_LIST_HEAD(&resource->node);
res_pool->free_count--;
+ error = 0;
+out_unlock:
mutex_unlock(&res_pool->mutex);
*new_resource = resource;
- return 0;
-error:
- if (mutex_locked)
- mutex_unlock(&res_pool->mutex);
-
+out:
return error;
}
EXPORT_SYMBOL_GPL(fsl_mc_resource_allocate);
@@ -241,26 +231,23 @@
void fsl_mc_resource_free(struct fsl_mc_resource *resource)
{
struct fsl_mc_resource_pool *res_pool;
- bool mutex_locked = false;
res_pool = resource->parent_pool;
if (WARN_ON(resource->type != res_pool->type))
- goto out;
+ return;
mutex_lock(&res_pool->mutex);
- mutex_locked = true;
if (WARN_ON(res_pool->free_count < 0 ||
res_pool->free_count >= res_pool->max_count))
- goto out;
+ goto out_unlock;
if (WARN_ON(!list_empty(&resource->node)))
- goto out;
+ goto out_unlock;
list_add_tail(&resource->node, &res_pool->free_list);
res_pool->free_count++;
-out:
- if (mutex_locked)
- mutex_unlock(&res_pool->mutex);
+out_unlock:
+ mutex_unlock(&res_pool->mutex);
}
EXPORT_SYMBOL_GPL(fsl_mc_resource_free);