From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752864AbbIPJrA (ORCPT ); Wed, 16 Sep 2015 05:47:00 -0400 Received: from mail-wi0-f170.google.com ([209.85.212.170]:36351 "EHLO mail-wi0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752678AbbIPJqy (ORCPT ); Wed, 16 Sep 2015 05:46:54 -0400 Date: Wed, 16 Sep 2015 11:46:48 +0200 From: Ingo Molnar To: Archit Taneja , Daniel Vetter Cc: Dave Airlie , Sudip Mukherjee , David Airlie , Daniel Vetter , LKML , dri-devel , Archit Taneja Subject: [PATCH] drm/mgag200: Fix calling drm_fb_helper_fini() twice Message-ID: <20150916094648.GA11711@gmail.com> References: <1441627110-13783-1-git-send-email-sudipm.mukherjee@gmail.com> <20150913093607.GA6074@gmail.com> <55F6E68D.8070800@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <55F6E68D.8070800@codeaurora.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Archit Taneja wrote: > From: Archit Taneja > Date: Mon, 14 Sep 2015 20:11:43 +0530 > Subject: [PATCH] drm/mgag200: Prevent calling drm_fb_helper_fini twice > > mgag200_fbdev_init's error handling path calls drm_fb_helper_fini before > bailing out. The error handling path of mgag200_driver_load also ends > up calling drm_fb_helper_fini. > > This results in drm_fb_helper_fini being called twice if the driver load > drm op fails somewhere in between. > > Make only mgag200_driver_unload call drm_fb_helper_fini, remove the call > from mgag200_fbdev_init. > > Signed-off-by: Archit Taneja > --- > drivers/gpu/drm/mgag200/mgag200_fb.c | 8 ++------ > 1 file changed, 2 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/mgag200/mgag200_fb.c > b/drivers/gpu/drm/mgag200/mgag200_fb.c > index 87de15e..6259b0a 100644 > --- a/drivers/gpu/drm/mgag200/mgag200_fb.c > +++ b/drivers/gpu/drm/mgag200/mgag200_fb.c > @@ -280,20 +280,16 @@ int mgag200_fbdev_init(struct mga_device *mdev) > > ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper); > if (ret) > - goto fini; > + return ret; > > /* disable all the possible outputs/crtcs before entering KMS mode */ > drm_helper_disable_unused_functions(mdev->dev); > > ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel); > if (ret) > - goto fini; > + return ret; > > return 0; > - > -fini: > - drm_fb_helper_fini(&mfbdev->helper); > - return ret; > } > > void mgag200_fbdev_fini(struct mga_device *mdev) So this patch was whitespace damaged - I applied it by hand and made the commit below. This has solved the crash, thanks Archit! And yes, you are right that my config probably crashed with older kernels too. Ingo =============> >>From 60d733a3ec19dc72372e12207a0a86293cd40cf5 Mon Sep 17 00:00:00 2001 From: Archit Taneja Date: Mon, 14 Sep 2015 20:53:57 +0530 Subject: [PATCH] drm/mgag200: Fix calling drm_fb_helper_fini() twice mgag200_fbdev_init()'s error handling path calls drm_fb_helper_fini() before bailing out. The error handling path of mgag200_driver_load() also ends up calling drm_fb_helper_fini(). This results in drm_fb_helper_fini() being called twice if the driver load drm op fails somewhere in between. Make only mgag200_driver_unload() call drm_fb_helper_fini(), remove the call from mgag200_fbdev_init(). Reported-by: Ingo Molnar Signed-off-by: Archit Taneja Cc: Archit Taneja Cc: Daniel Vetter Cc: Dave Airlie Cc: David Airlie Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Sudip Mukherjee Cc: Thomas Gleixner Cc: dri-devel Link: http://lkml.kernel.org/r/55F6E68D.8070800@codeaurora.org Signed-off-by: Ingo Molnar --- drivers/gpu/drm/mgag200/mgag200_fb.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/mgag200/mgag200_fb.c b/drivers/gpu/drm/mgag200/mgag200_fb.c index 87de15ea1f93..6259b0a5fc38 100644 --- a/drivers/gpu/drm/mgag200/mgag200_fb.c +++ b/drivers/gpu/drm/mgag200/mgag200_fb.c @@ -280,20 +280,16 @@ int mgag200_fbdev_init(struct mga_device *mdev) ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper); if (ret) - goto fini; + return ret; /* disable all the possible outputs/crtcs before entering KMS mode */ drm_helper_disable_unused_functions(mdev->dev); ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel); if (ret) - goto fini; + return ret; return 0; - -fini: - drm_fb_helper_fini(&mfbdev->helper); - return ret; } void mgag200_fbdev_fini(struct mga_device *mdev)