Several GEM core functions manually managed mutex_lock() and mutex_unlock() over single scopes or error paths. This adds boilerplate and carries the risk of lock leaks if error paths are refactored.
Modernize these locks by deploying the <linux/cleanup.h> scoped_guard() macro. This ensures that the locks are reliably dropped when the block exits, cleanly removing goto out_unlock paths and tightening the lifecycle. Signed-off-by: Biren Pandya <[email protected]> Compiled locally, but requires IGT validation by the DRM CI. --- drivers/gpu/drm/drm_gem.c | 66 ++++++++++++++++++--------------------- 1 file changed, 30 insertions(+), 36 deletions(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 891c3bff5ae0..d3a061d42ba7 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -346,13 +346,13 @@ void drm_gem_object_handle_put_unlocked(struct drm_gem_object *obj) * we checked for a name. */ - mutex_lock(&dev->object_name_lock); - if (--obj->handle_count == 0) { - drm_gem_object_handle_free(obj); - drm_gem_object_exported_dma_buf_free(obj); - final = true; + scoped_guard(mutex, &dev->object_name_lock) { + if (--obj->handle_count == 0) { + drm_gem_object_handle_free(obj); + drm_gem_object_exported_dma_buf_free(obj); + final = true; + } } - mutex_unlock(&dev->object_name_lock); if (final) drm_gem_object_put(obj); @@ -374,11 +374,8 @@ drm_gem_object_release_handle(int id, void *ptr, void *data) if (obj->funcs->close) obj->funcs->close(obj, file_priv); - mutex_lock(&file_priv->prime.lock); - - drm_prime_remove_buf_handle(&file_priv->prime, id); - - mutex_unlock(&file_priv->prime.lock); + scoped_guard(mutex, &file_priv->prime.lock) + drm_prime_remove_buf_handle(&file_priv->prime, id); drm_vma_node_revoke(&obj->vma_node, file_priv); @@ -1021,37 +1018,34 @@ int drm_gem_change_handle_ioctl(struct drm_device *dev, void *data, goto out; } - mutex_lock(&file_priv->prime.lock); + scoped_guard(mutex, &file_priv->prime.lock) { + spin_lock(&file_priv->table_lock); + ret = idr_alloc(&file_priv->object_idr, obj, handle, handle + 1, + GFP_NOWAIT); + spin_unlock(&file_priv->table_lock); - spin_lock(&file_priv->table_lock); - ret = idr_alloc(&file_priv->object_idr, obj, handle, handle + 1, - GFP_NOWAIT); - spin_unlock(&file_priv->table_lock); + if (ret < 0) + break; - if (ret < 0) - goto out_unlock; + if (obj->dma_buf) { + ret = drm_prime_add_buf_handle(&file_priv->prime, obj->dma_buf, + handle); + if (ret < 0) { + spin_lock(&file_priv->table_lock); + idr_remove(&file_priv->object_idr, handle); + spin_unlock(&file_priv->table_lock); + break; + } - if (obj->dma_buf) { - ret = drm_prime_add_buf_handle(&file_priv->prime, obj->dma_buf, - handle); - if (ret < 0) { - spin_lock(&file_priv->table_lock); - idr_remove(&file_priv->object_idr, handle); - spin_unlock(&file_priv->table_lock); - goto out_unlock; + drm_prime_remove_buf_handle(&file_priv->prime, args->handle); } - drm_prime_remove_buf_handle(&file_priv->prime, args->handle); - } - - ret = 0; - - spin_lock(&file_priv->table_lock); - idr_remove(&file_priv->object_idr, args->handle); - spin_unlock(&file_priv->table_lock); + ret = 0; -out_unlock: - mutex_unlock(&file_priv->prime.lock); + spin_lock(&file_priv->table_lock); + idr_remove(&file_priv->object_idr, args->handle); + spin_unlock(&file_priv->table_lock); + } out: drm_gem_object_put(obj); base-commit: 72c25183cac9bc584c9de21797a5883af44bcc7a -- 2.50.1 (Apple Git-155)
