[Bug 78401] Call traces from i915 referencing drm_modeset_lock / drm_modeset_drop_locks

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=78401

--- Comment #3 from Alan Bartlett <ajb at elrepo.org> ---
(In reply to Ville Syrjala from comment #2)
> https://patchwork.kernel.org/patch/4315611/

I am pleased to report that applying the above patch resolves the problem in
the drivers/gpu/drm/drm_modeset_lock.c file.

However a new code trace was seen, this time originating from the
g4x_wait_for_vblank function of the drivers/gpu/drm/i915/intel_display.c file.

------------[ cut here ]------------
WARNING: CPU: 0 PID: 113 at drivers/gpu/drm/i915/intel_display.c:861
g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: i915 drm_kms_helper video
CPU: 0 PID: 113 Comm: plymouthd Not tainted 3.16.0-0.rc1.inc2.el6.elrepo.x86_64
#1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19
06/13/2013
 000000000000035d ffff8800dc4239c8 ffffffff8164f6b6 000000000000035d
 ffff8800dc423a18 ffff8800dc423a08 ffffffff8107146c 00000000fffb740d
 ffff8800dcfa0000 0000000000071040 000000000000000d 00000000fffb740c
Call Trace:
 [<ffffffff8164f6b6>] dump_stack+0x49/0x5b
 [<ffffffff8107146c>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff81071556>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078465>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00784b5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00ad76b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ada65>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>]
drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81403664>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20
[drm_kms_helper]
 [<ffffffff81405e7c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f7c90>] drm_ioctl+0x350/0x630
 [<ffffffff81405a70>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811df593>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126b1af>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811df941>] SyS_ioctl+0xa1/0xb0
 [<ffffffff81653e29>] system_call_fastpath+0x16/0x1b
---[ end trace 29d16e55157f97ce ]---

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