RPM wakelock ref not held during HW access

[Sergey Senozhatsky]

Hello,

-mmots 4.4.0-mm1-dbg-00602-g776bd09


[ 5331.509087] WARNING: CPU: 0 PID: 359 at drivers/gpu/drm/i915/intel_drv.h:1446 gen6_read32+0x7b/0x253 [i915]()
[ 5331.509091] RPM wakelock ref not held during HW access
[ 5331.509093] Modules linked in:
[ 5331.509182] CPU: 0 PID: 359 Comm: Xorg Not tainted 4.4.0-mm1-dbg-00602-g776bd09-dirty #34
[ 5331.509186]  0000000000000000 ffff88041bddfac0 ffffffff811eb860 ffff88041bddfb08
[ 5331.509194]  ffff88041bddfaf8 ffffffff81040fc2 ffffffffa05442a9 ffff88041aab0000
[ 5331.509200]  0000000000064000 ffff88041afcb001 0000000000000001 ffff88041bddfb60
[ 5331.509207] Call Trace:
[ 5331.509218]  [<ffffffff811eb860>] dump_stack+0x4b/0x63
[ 5331.509227]  [<ffffffff81040fc2>] warn_slowpath_common+0x99/0xb2
[ 5331.509277]  [<ffffffffa05442a9>] ? gen6_read32+0x7b/0x253 [i915]
[ 5331.509283]  [<ffffffff81041023>] warn_slowpath_fmt+0x48/0x50
[ 5331.509331]  [<ffffffffa05442a9>] gen6_read32+0x7b/0x253 [i915]
[ 5331.509338]  [<ffffffff813b8ff6>] ? mutex_unlock+0xe/0x10
[ 5331.509391]  [<ffffffffa057ae04>] intel_ddi_get_hw_state+0x5e/0x159 [i915]
[ 5331.509443]  [<ffffffffa057cdd8>] intel_ddi_connector_get_hw_state+0x5c/0xdf [i915]
[ 5331.509494]  [<ffffffffa056134b>] intel_atomic_commit+0x8e0/0x1250 [i915]
[ 5331.509528]  [<ffffffffa03f7acb>] ? drm_atomic_check_only+0x293/0x564 [drm]
[ 5331.509558]  [<ffffffffa03f7de9>] drm_atomic_commit+0x4d/0x52 [drm]
[ 5331.509572]  [<ffffffffa04e193e>] drm_atomic_helper_connector_dpms+0x116/0x17e [drm_kms_helper]
[ 5331.509599]  [<ffffffffa03ee56c>] drm_mode_obj_set_property_ioctl+0xef/0x17a [drm]
[ 5331.509626]  [<ffffffffa03ee627>] drm_mode_connector_property_set_ioctl+0x30/0x32 [drm]
[ 5331.509642]  [<ffffffffa03e10cb>] drm_ioctl+0x26d/0x3a8 [drm]
[ 5331.509668]  [<ffffffffa03ee5f7>] ? drm_mode_obj_set_property_ioctl+0x17a/0x17a [drm]
[ 5331.509675]  [<ffffffff81081c42>] ? lock_acquire+0x101/0x188
[ 5331.509681]  [<ffffffff81165543>] ? __fget+0x5/0x19d
[ 5331.509685]  [<ffffffff8107d59a>] ? __lock_is_held+0x3c/0x57
[ 5331.509691]  [<ffffffff8115ae60>] vfs_ioctl+0x18/0x34
[ 5331.509695]  [<ffffffff8115b489>] do_vfs_ioctl+0x572/0x5f1
[ 5331.509699]  [<ffffffff81165764>] ? __fget_light+0x62/0x71
[ 5331.509704]  [<ffffffff8115b54b>] SyS_ioctl+0x43/0x61
[ 5331.509711]  [<ffffffff813bb017>] entry_SYSCALL_64_fastpath+0x12/0x6f
[ 5331.509715] ---[ end trace 70d4fd86a0395d92 ]---

	-ss