[-next] WARNING at ww_mutex.h in drm_atomic_check_only

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Hi,

rc6-next-20150813


[    1.987833] fbcon: inteldrmfb (fb0) is primary device
[    1.988589] ------------[ cut here ]------------
[    1.988607] WARNING: CPU: 0 PID: 62 at include/linux/ww_mutex.h:158 drm_atomic_check_only+0x24e/0x4ed [drm]()
[    1.988609] DEBUG_LOCKS_WARN_ON(ctx->done_acquire)
[    1.988631] Modules linked in: arc4 nls_iso8859_1 nls_cp437 iwlmvm vfat coretemp hwmon mac80211 serio_raw acpi_cpufreq(-) fat psmouse atkbd iwlwifi libps2 intel_powerclamp i915(+) crc32c_intel cfg80211 r8169 i2c_algo_bit drm_kms_helper cfbfillrect syscopyarea cfbimgblt mii i2c_i801 sysfillrect lpc_ich mfd_core sysimgblt mxm_wmi fb_sys_fops cfbcopyarea thermal drm ie31200_edac edac_core i8042 video wmi evdev backlight serio processor ext4 crc16 mbcache jbd2 sd_mod ehci_pci ehci_hcd ahci libahci libata xhci_pci scsi_mod xhci_hcd usbcore usb_common
[    1.988633] CPU: 0 PID: 62 Comm: kworker/u16:1 Not tainted 4.2.0-rc6-next-20150813-dbg-00006-gf3ed897-dirty #201
[    1.988638] Workqueue: events_unbound async_run_entry_fn
[    1.988640]  0000000000000000 ffff88041bb73870 ffffffff813921e2 ffff88041bb738b8
[    1.988641]  ffff88041bb738a8 ffffffff810398ea ffffffffa02d8789 ffff88041cf7b400
[    1.988642]  ffff8800c6eac000 ffff880037f01000 ffff88041ad4f600 ffff88041bb73910
[    1.988643] Call Trace:
[    1.988646]  [<ffffffff813921e2>] dump_stack+0x4b/0x63
[    1.988648]  [<ffffffff810398ea>] warn_slowpath_common+0x99/0xb2
[    1.988661]  [<ffffffffa02d8789>] ? drm_atomic_check_only+0x24e/0x4ed [drm]
[    1.988662]  [<ffffffff8103994b>] warn_slowpath_fmt+0x48/0x50
[    1.988673]  [<ffffffffa02d8789>] drm_atomic_check_only+0x24e/0x4ed [drm]
[    1.988683]  [<ffffffffa02d8a3f>] drm_atomic_commit+0x17/0x52 [drm]
[    1.988690]  [<ffffffffa025e9c5>] drm_atomic_helper_plane_set_property+0x6e/0xa5 [drm_kms_helper]
[    1.988701]  [<ffffffffa02c92a6>] drm_mode_plane_set_obj_prop+0x31/0x56 [drm]
[    1.988706]  [<ffffffffa0260235>] restore_fbdev_mode+0x66/0xd2 [drm_kms_helper]
[    1.988712]  [<ffffffffa0261820>] drm_fb_helper_restore_fbdev_mode_unlocked+0x27/0x5e [drm_kms_helper]
[    1.988716]  [<ffffffffa0261896>] drm_fb_helper_set_par+0x3f/0x4b [drm_kms_helper]
[    1.988752]  [<ffffffffa043df07>] intel_fbdev_set_par+0x17/0x56 [i915]
[    1.988755]  [<ffffffff81206f19>] fbcon_init+0x337/0x443
[    1.988757]  [<ffffffff81256c25>] visual_init+0xcd/0x122
[    1.988759]  [<ffffffff812582ae>] do_bind_con_driver+0x1b6/0x2d5
[    1.988761]  [<ffffffff812586de>] do_take_over_console+0x164/0x18e
[    1.988763]  [<ffffffff81204eb1>] do_fbcon_takeover+0x60/0x9c
[    1.988764]  [<ffffffff8120876c>] fbcon_event_notify+0x423/0x746
[    1.988766]  [<ffffffff810564e8>] ? __blocking_notifier_call_chain+0x33/0x67
[    1.988767]  [<ffffffff81056253>] notifier_call_chain+0x4a/0x6c
[    1.988768]  [<ffffffff81056501>] __blocking_notifier_call_chain+0x4c/0x67
[    1.988769]  [<ffffffff81056530>] blocking_notifier_call_chain+0x14/0x16
[    1.988771]  [<ffffffff812099dc>] fb_notifier_call_chain+0x1b/0x1d
[    1.988772]  [<ffffffff8120b3a5>] register_framebuffer+0x295/0x2cd
[    1.988778]  [<ffffffffa0261b3c>] drm_fb_helper_initial_config+0x29a/0x75e [drm_kms_helper]
[    1.988809]  [<ffffffffa043e84d>] intel_fbdev_initial_config+0x1b/0x1d [i915]
[    1.988810]  [<ffffffff810573d0>] async_run_entry_fn+0x37/0xcd
[    1.988812]  [<ffffffff8104f600>] process_one_work+0x294/0x54d
[    1.988813]  [<ffffffff81050665>] worker_thread+0x273/0x366
[    1.988815]  [<ffffffff810503f2>] ? rescuer_thread+0x2a7/0x2a7
[    1.988816]  [<ffffffff810551f7>] kthread+0xf8/0x100
[    1.988818]  [<ffffffff810550ff>] ? kthread_create_on_node+0x1c7/0x1c7
[    1.988820]  [<ffffffff8139887f>] ret_from_fork+0x3f/0x70
[    1.988822]  [<ffffffff810550ff>] ? kthread_create_on_node+0x1c7/0x1c7
[    1.988823] ---[ end trace 80dfb9f9e0dae41e ]---

	-ss
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