4.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> commit afe705be38f1e65b173868486944377186b9f206 upstream. Since the introduction of (struct_mutex) lockless GEM bo freeing, there are a pair of driver vfuncs for freeing the GEM bo, of which the driver may choose to only implement driver->gem_object_free_unlocked (and so avoid taking the struct_mutex along the free path). However, the CMA GEM helpers were still calling driver->gem_free_object directly, now NULL, and promptly dying on the fancy new lockless drivers. Oops. Robert Foss bisected this to b82caafcf2303 (drm/vc4: Use lockless gem BO free callback) on his vc4 device, but that just serves as an enabler for 9f0ba539d13ae (drm/gem: support BO freeing without dev->struct_mutex). Reported-by: Robert Foss <robert.foss@xxxxxxxxxxxxx> Fixes: 9f0ba539d13ae (drm/gem: support BO freeing without dev->struct_mutex) Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Robert Foss <robert.foss@xxxxxxxxxxxxx> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx> Cc: Eric Anholt <eric@xxxxxxxxxx> Cc: Alex Deucher <alexdeucher@xxxxxxxxx> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Tested-by: Robert Foss <robert.foss@xxxxxxxxxxxxx> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/drm_fb_cma_helper.c | 2 +- drivers/gpu/drm/drm_gem_cma_helper.c | 12 +++--------- 2 files changed, 4 insertions(+), 10 deletions(-) --- a/drivers/gpu/drm/drm_fb_cma_helper.c +++ b/drivers/gpu/drm/drm_fb_cma_helper.c @@ -301,7 +301,7 @@ static int drm_fbdev_cma_create(struct d err_fb_info_destroy: drm_fb_helper_release_fbi(helper); err_gem_free_object: - dev->driver->gem_free_object(&obj->base); + drm_gem_object_unreference_unlocked(&obj->base); return ret; } --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -121,7 +121,7 @@ struct drm_gem_cma_object *drm_gem_cma_c return cma_obj; error: - drm->driver->gem_free_object(&cma_obj->base); + drm_gem_object_unreference_unlocked(&cma_obj->base); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(drm_gem_cma_create); @@ -162,18 +162,12 @@ drm_gem_cma_create_with_handle(struct dr * and handle has the id what user can see. */ ret = drm_gem_handle_create(file_priv, gem_obj, handle); - if (ret) - goto err_handle_create; - /* drop reference from allocate - handle holds it now. */ drm_gem_object_unreference_unlocked(gem_obj); + if (ret) + return ERR_PTR(ret); return cma_obj; - -err_handle_create: - drm->driver->gem_free_object(gem_obj); - - return ERR_PTR(ret); } /** -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html