From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:47500 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755072AbcGYVlN (ORCPT ); Mon, 25 Jul 2016 17:41:13 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Robert Foss , Chris Wilson , Daniel Vetter , Eric Anholt , Alex Deucher , Lucas Stach , Daniel Vetter , Dave Airlie Subject: [PATCH 4.6 128/203] drm: Wrap direct calls to driver->gem_free_object from CMA Date: Mon, 25 Jul 2016 13:55:43 -0700 Message-Id: <20160725203434.605297746@linuxfoundation.org> In-Reply-To: <20160725203429.221747288@linuxfoundation.org> References: <20160725203429.221747288@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chris Wilson 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 Fixes: 9f0ba539d13ae (drm/gem: support BO freeing without dev->struct_mutex) Signed-off-by: Chris Wilson Cc: Robert Foss Cc: Daniel Vetter Cc: Eric Anholt Cc: Alex Deucher Cc: Lucas Stach Reviewed-by: Daniel Vetter Tested-by: Robert Foss Signed-off-by: Dave Airlie Signed-off-by: Greg Kroah-Hartman --- 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); } /**