On Sat, Apr 13, 2013 at 06:10:40PM +0100, Chris Wilson wrote: > On Sat, Apr 13, 2013 at 05:41:46PM +0200, Krzysztof Mazur wrote: > > Hi, > > > > the drm_fb_helper_hotplug_event() locks all crtc->mutex locks by calling > > drm_modeset_lock_all() and later calls drm_fb_helper_probe_connector_modes(), > > which in case of i915 DRM driver effectively calls > > intel_get_load_detect_pipe() that tries to lock crtc->mutex again. > > This causes a deadlock, and can be in some cases triggered by VT > > switch to framebuffer console on i915. > > > > This bug is introduced in Linux 3.9-rc1 and still exists > > in v3.9-rc6-183-gbf81710. Linux 3.8 is ok. > > In Dave's drm-fixes branch: > > commit 89ced125472b8551c65526934b7f6c733a6864fa > Author: Daniel Vetter <daniel.vetter@xxxxxxxx> > Date: Thu Apr 11 14:26:55 2013 +0000 > > drm/fb-helper: Fix locking in drm_fb_helper_hotplug_event Yes, this patch fixes the problem. Thanks, Krzysiek _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
