Chris Wilson 752d2635eb drm: Take lock around probes for drm_fb_helper_hotplug_event ... We need to hold the dev->mode_config.mutex whilst detecting the output status. But we also need to drop it for the call into drm_fb_helper_single_fb_probe(), which indirectly acquires the lock when attaching the fbcon. Failure to do so exposes a race with normal output probing. Detected by adding some warnings that the mutex is held to the backend detect routines: [ 17.772456] WARNING: at drivers/gpu/drm/i915/intel_crt.c:471 intel_crt_detect+0x3e/0x373 [i915]() [ 17.772458] Hardware name: Latitude E6400 [ 17.772460] Modules linked in: .... [ 17.772582] Pid: 11, comm: kworker/0:1 Tainted: G W 2.6.38.4-custom.2 #8 [ 17.772584] Call Trace: [ 17.772591] [<ffffffff81046af5>] ? warn_slowpath_common+0x78/0x8c [ 17.772603] [<ffffffffa03f3e5c>] ? intel_crt_detect+0x3e/0x373 [i915] [ 17.772612] [<ffffffffa0355d49>] ? drm_helper_probe_single_connector_modes+0xbf/0x2af [drm_kms_helper] [ 17.772619] [<ffffffffa03534d5>] ? drm_fb_helper_probe_connector_modes+0x39/0x4d [drm_kms_helper] [ 17.772625] [<ffffffffa0354760>] ? drm_fb_helper_hotplug_event+0xa5/0xc3 [drm_kms_helper] [ 17.772633] [<ffffffffa035577f>] ? output_poll_execute+0x146/0x17c [drm_kms_helper] [ 17.772638] [<ffffffff81193c01>] ? cfq_init_queue+0x247/0x345 [ 17.772644] [<ffffffffa0355639>] ? output_poll_execute+0x0/0x17c [drm_kms_helper] [ 17.772648] [<ffffffff8105b540>] ? process_one_work+0x193/0x28e [ 17.772652] [<ffffffff8105c6bc>] ? worker_thread+0xef/0x172 [ 17.772655] [<ffffffff8105c5cd>] ? worker_thread+0x0/0x172 [ 17.772658] [<ffffffff8105c5cd>] ? worker_thread+0x0/0x172 [ 17.772663] [<ffffffff8105f767>] ? kthread+0x7a/0x82 [ 17.772668] [<ffffffff8100a724>] ? kernel_thread_helper+0x4/0x10 [ 17.772671] [<ffffffff8105f6ed>] ? kthread+0x0/0x82 [ 17.772674] [<ffffffff8100a720>] ? kernel_thread_helper+0x0/0x10 Reported-by: Frederik Himpe <fhimpe@telenet.be> References: https://bugs.freedesktop.org/show_bug.cgi?id=36394 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Dave Airlie <airlied@redhat.com>		2011-05-16 12:01:43 +10:00
..
i2c	drm: Import driver for the sil164 I2C TMDS transmitter.	2010-08-02 10:21:13 +10:00
ttm	Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6	2011-04-07 11:14:49 -07:00
drm_buffer.h	drm: Add generic multipart buffer.	2010-02-23 09:46:20 +10:00
drm_cache.h	drm/ttm: consolidate cache flushing code in one place.	2009-08-27 09:53:47 +10:00
drm_core.h	drm: Fix support for PCI domains	2010-08-10 08:20:20 +10:00
drm_crtc_helper.h	drm, kdb, kms: Change mode_set_base_atomic() enter argument to be an enum	2010-10-19 14:13:33 +10:00
drm_crtc.h	Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6	2011-04-07 11:14:49 -07:00
drm_dp_helper.h	drm/i915: fetch eDP configuration data from the VBT	2010-10-08 10:28:21 +01:00
drm_edid.h	drm/edid: Add detailed block walk for CEA extensions	2010-08-10 10:46:57 +10:00
drm_encoder_slave.h	drm/kms: no need to return void value (encoder)	2009-08-19 16:06:49 +10:00
drm_fb_helper.h	drm: Take lock around probes for drm_fb_helper_hotplug_event	2011-05-16 12:01:43 +10:00
drm_fixed.h	drm: move radeon_fixed.h to shared drm_fixed.h header	2010-05-18 18:21:33 +10:00
drm_global.h	drm: move ttm global code to core drm	2010-08-04 09:46:06 +10:00
drm_hashtab.h	drm: Remove unused members from struct drm_open_hash	2011-02-23 11:16:40 +10:00
drm_mem_util.h	drm/ttm: use drm calloc large and free large	2010-03-15 10:31:43 +10:00
drm_memory.h	includecheck fix: include/drm, drm_memory.h	2009-09-20 16:02:58 +05:30
drm_mm.h	drm: mm: fix debug output	2011-05-09 09:14:45 +10:00
drm_mode.h	Fix common misspellings	2011-03-31 11:26:23 -03:00
drm_os_linux.h	drm/i915: add i915_lp_ring_sync helper	2009-11-05 14:47:07 -08:00
drm_pciids.h	drm/radeon/kms: add some new pci ids	2011-05-04 09:28:59 +10:00
drm_sarea.h	drm: move to kref per-master structures.	2008-12-29 17:47:22 +10:00
drm_sman.h
drm_sysfs.h	drm: Enable drm drivers to add drm sysfs devices.	2009-08-19 16:08:51 +10:00
drm_usb.h	drm: add usb framework	2011-02-07 13:09:42 +10:00
drm.h	drm/vblank: update recently added vbl interface to be more future proof.	2011-03-24 21:28:46 +10:00
drmP.h	Fix common misspellings	2011-03-31 11:26:23 -03:00
i810_drm.h
i915_drm.h	drm/i915: Allow relocation deltas outside of target bo	2011-03-01 16:01:02 +00:00
intel-gtt.h	intel-gtt: export api for drm/i915	2010-11-23 20:14:47 +00:00
Kbuild	drm: remove i830 driver	2011-02-07 12:14:18 +10:00
mga_drm.h	Fix common misspellings	2011-03-31 11:26:23 -03:00
nouveau_drm.h	drm/nv50: support for compression	2011-02-25 06:46:07 +10:00
r128_drm.h
radeon_drm.h	drm/radeon/kms: fix gart setup on fusion parts (v2)	2011-05-04 10:16:40 +10:00
savage_drm.h	Fix common misspellings	2011-03-31 11:26:23 -03:00
sis_drm.h
via_drm.h	drm: Add compatibility #ifdefs for *BSD	2009-12-04 08:59:28 +10:00
vmwgfx_drm.h	Fix common misspellings	2011-03-31 11:26:23 -03:00