[Intel-gfx] [PATCH] Drop the mutex whilst waiting for a request

[Chris Wilson]

Hello all,

I'm seem to be able to hang the chip at will, though it seems quite
sensitive to timing. For example if I sync the batch buffer after every
exec, the bug disappears and rendering continues.

During the course of my travails I found that i915_wait_request() holds
the struct_mutex whilst sleeping which, among other effects, prevents me
from accessing the proc/debug interfaces. So I've attached a rudimentary
patch to drop the mutex for the duration of the sleep. Review would be
appreciated.

Thanks.
-ickle
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