[Bug 93711] BUG in i915_gem.c freezed the console

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=93711

--- Comment #23 from Martin Ziegler <ziegler at uni-freiburg.de> ---
Ich applied Damien's patch to 4.0-rc5.

Before the patch I had two warnings druring boot:

   WARNING: CPU: 3 PID: 1 at include/linux/kref.h:47
drm_framebuffer_reference+0x56/0x5f()
   WARNING: CPU: 2 PID: 6 at drivers/gpu/drm/drm_atomic.c:482
drm_atomic_check_only+0x3a9/0x3cf()

After the patch only the following warning:

   Mar 25 21:46:01 zertz kernel: [drm] GMBUS [i915 gmbus dpb] timed out,
falling back to bit banging on pin 5
   ...
   fbcon: inteldrmfb (fb0) is primary device
   ------------[ cut here ]------------
   WARNING: CPU: 0 PID: 6 at drivers/gpu/drm/drm_atomic.c:482
drm_atomic_check_only+0x3a9/0x3cf()
   Modules linked in:
   CPU: 0 PID: 6 Comm: kworker/u8:0 Tainted: G     U         
4.0.0-rc5-00003-gad5de1d #77
   Hardware name: LENOVO 4349WK7/4349WK7, BIOS 6MET81WW (1.41) 10/26/2010
   Workqueue: events_unbound async_run_entry_fn
   0000000000000000 0000000000000009 ffffffff813d2040 0000000000000000
   ffffffff81036594 ffff8801334c2710 ffffffff81241786 0000000000000088
   ffff8800b6c66180 ffff8800b6c93000 0000000000000002 ffff8800b6c5a180
   Call Trace:
   [<ffffffff813d2040>] ? dump_stack+0x40/0x50
   [<ffffffff81036594>] ? warn_slowpath_common+0x93/0xab
   [<ffffffff81241786>] ? drm_atomic_check_only+0x3a9/0x3cf
   [<ffffffff81241786>] ? drm_atomic_check_only+0x3a9/0x3cf
   [<ffffffff812417ba>] ? drm_atomic_commit+0xe/0x4d
   [<ffffffff812264da>] ?
   drm_atomic_helper_plane_set_property+0x68/0xa3
   [<ffffffff81240c43>] ? modeset_lock+0x8f/0xf2
   [<ffffffff812345ee>] ? drm_mode_plane_set_obj_prop+0x28/0x49
   [<ffffffff81227a8c>] ? restore_fbdev_mode+0x5f/0xc7
   [<ffffffff8122934c>] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x1e/0x54
   [<ffffffff812293b0>] ? drm_fb_helper_set_par+0x2e/0x32
   [<ffffffff8129fc1b>] ? intel_fbdev_set_par+0x11/0x55
   [<ffffffff811bc715>] ? fbcon_init+0x327/0x442
   [<ffffffff81209ec1>] ? visual_init+0xaf/0x102
   [<ffffffff8120b422>] ? do_bind_con_driver+0x18e/0x295
   [<ffffffff8120b9db>] ? do_take_over_console+0x150/0x179
   [<ffffffff811b90df>] ? do_fbcon_takeover+0x58/0x94
   [<ffffffff8104a8de>] ? notifier_call_chain+0x35/0x59
   [<ffffffff8104aaff>] ?
   __blocking_notifier_call_chain+0x42/0x5d
   [<ffffffff811c0017>] ? register_framebuffer+0x281/0x2b4
   [<ffffffff81229632>] ? drm_fb_helper_initial_config+0x27e/0x330
   [<ffffffff81001684>] ? __switch_to+0x1ff/0x45d
   [<ffffffff8104bb5a>] ? async_run_entry_fn+0x2d/0xbf
   [<ffffffff810467a5>] ? process_one_work+0x142/0x214
   [<ffffffff81046ce3>] ? worker_thread+0x1c3/0x26d
   [<ffffffff81046b20>] ? rescuer_thread+0x284/0x284
   [<ffffffff8104a0c8>] ? kthread+0xab/0xb3
   [<ffffffff81040000>] ? get_signal+0x2e0/0x4ce
   [<ffffffff8104a01d>] ? __kthread_parkme+0x5d/0x5d
   [<ffffffff813d60c8>] ? ret_from_fork+0x58/0x90
   [<ffffffff8104a01d>] ? __kthread_parkme+0x5d/0x5d
   ---[ end trace 8d8be2074054d8dc ]---

Martin

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