[Bug 100419] [BDW][EXT] igt at kms_flip@vblank-vs-dpms-suspend-interruptible hard LOCKUP on cpu 3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100419

--- Comment #14 from Imre Deak <imre.deak at intel.com> ---
(In reply to Marta Löfstedt from comment #13)
> For more information on the patch I reverted. The patch introduce a
> potential 200ms busy-wait when interrupts are turned off. Also, if the state
> isn't updated with-in those 200 ms, nothing is done. 
> I believe this patch should be rewritten by audio developers.

Agreed, using jiffies in hdac_wait_for_cmd_dmas() to determine when to time out
when interrupts are off (snd_hdac_bus_stop_cmd_io()/spin_lock_irq()) is bogus.

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