From: Rafael Barbalho Date: Thu, 24 Jul 2014 14:16:12 +0000 (+0100) Subject: drm/i915: Fix crash when failing to parse MIPI VBT X-Git-Tag: omap-for-v3.17/fixes-against-rc2~124^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed3b6679936801fa2dab47e7a6ef74e383400ed9;p=pandora-kernel.git drm/i915: Fix crash when failing to parse MIPI VBT This particular nasty presented itself while trying to register the intelfb device (intel_fbdev.c). During the process of registering the device the driver will disable the crtc via i9xx_crtc_disable. These will also disable the panel using the generic mipi panel functions in dsi_mod_vbt_generic.c. The stale MIPI generic data sequence pointers would cause a crash within those functions. However, all of this is happening while console_lock is held from do_register_framebuffer inside fbcon.c. Which means that you got kernel log and just the device appearing to reboot/hang for no apparent reason. The fault started from the FB_EVENT_FB_REGISTERED event using the fb_notifier_call_chain call in fbcon.c. This regression has been introduced in commit d3b542fcfc72d7724585e3fd2c5e75351bc3df47 Author: Shobhit Kumar Date: Mon Apr 14 11:00:34 2014 +0530 drm/i915: Add parsing support for new MIPI blocks in VBT Cc: Shobhit Kumar Signed-off-by: Rafael Barbalho Reviewed-by: Shobhit Kumar [danvet: Add regression citation.] Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter --- Reading git-diff-tree failed