From: Daniel Vetter Date: Wed, 30 Mar 2016 09:40:47 +0000 (+0200) Subject: drm/exynos: drop struct_mutex from exynos_drm_gem_get_ioctl X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6c991a220873ede48ba735d4fb8e7bc780829f5e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git drm/exynos: drop struct_mutex from exynos_drm_gem_get_ioctl The only things this protects is reading ->flags and ->size, both of which are invariant over the lifetime of an exynos gem bo. So no locking needed at all (besides that, nothing protects the writers anyway). Aside: exynos_gem_obj->size is redundant with exynos_gem_obj->base.size and probably should be removed. v2: Use _unlocked unreference (Daniel Stone). Cc: Daniel Stone Cc: Inki Dae Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1459330852-27668-9-git-send-email-daniel.vetter@ffwll.ch --- diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index 60b9975bb0b1..6fb98f4c3544 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -362,12 +362,9 @@ int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, struct drm_exynos_gem_info *args = data; struct drm_gem_object *obj; - mutex_lock(&dev->struct_mutex); - obj = drm_gem_object_lookup(dev, file_priv, args->handle); if (!obj) { DRM_ERROR("failed to lookup gem object.\n"); - mutex_unlock(&dev->struct_mutex); return -EINVAL; } @@ -376,8 +373,7 @@ int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, args->flags = exynos_gem->flags; args->size = exynos_gem->size; - drm_gem_object_unreference(obj); - mutex_unlock(&dev->struct_mutex); + drm_gem_object_unreference_unlocked(obj); return 0; }