From d36a6b361a3a181559daebcf32e11ab18431a854 Mon Sep 17 00:00:00 2001 From: Cihangir Akturk Date: Sat, 9 Apr 2016 21:45:18 +0300 Subject: [PATCH 164/226] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/staging/fsl-mc/bus/mc-allocator.c | 61 ++++++++++++----------------- 1 file changed, 24 insertions(+), 37 deletions(-) --- a/drivers/staging/fsl-mc/bus/mc-allocator.c +++ b/drivers/staging/fsl-mc/bus/mc-allocator.c @@ -39,7 +39,6 @@ static int __must_check fsl_mc_resource_ 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 @@ static int __must_check fsl_mc_resource_ 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 @@ static int __must_check fsl_mc_resource_ 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 @@ static int __must_check fsl_mc_resource_ 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 @@ static int __must_check fsl_mc_resource_ 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 @@ static int __must_check fsl_mc_resource_ 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 @@ static int __must_check fsl_mc_resource_ 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 @@ static int __must_check fsl_mc_resource_ 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 @@ int __must_check fsl_mc_resource_allocat 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 @@ int __must_check fsl_mc_resource_allocat 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 @@ EXPORT_SYMBOL_GPL(fsl_mc_resource_alloca 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);