From 141518b64f611536fb7968d291c794d71879099e Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 9 Jul 2015 23:32:41 +0200 Subject: [PATCH] drm/cma-helper: Don't grab dev->struct_mutex for in mmap offset ioctl Since David Herrmann's mmap vma manager rework we don't need to grab dev->struct_mutex any more to prevent races when looking up the mmap offset. Drop it and instead don't forget to use the unref_unlocked variant (since the drm core still cares). Cc: Laurent Pinchart Cc: Rob Clark Reviewed-by: Thierry Reding Signed-off-by: Daniel Vetter --- drivers/gpu/drm/drm_gem_cma_helper.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c index 9edad11..86cc793 100644 --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -289,20 +289,15 @@ int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv, { struct drm_gem_object *gem_obj; - mutex_lock(&drm->struct_mutex); - gem_obj = drm_gem_object_lookup(drm, file_priv, handle); if (!gem_obj) { dev_err(drm->dev, "failed to lookup GEM object\n"); - mutex_unlock(&drm->struct_mutex); return -EINVAL; } *offset = drm_vma_node_offset_addr(&gem_obj->vma_node); - drm_gem_object_unreference(gem_obj); - - mutex_unlock(&drm->struct_mutex); + drm_gem_object_unreference_unlocked(gem_obj); return 0; } -- 2.7.4