[PATCH] drm/vmwgfx: Replace the hw mutex with a hw spinlock

[Thomas Hellstrom]

Hi, Dave,

It's intended for -fixes. I was just about to send a pull request but
got distracted.

Thanks,
Thomas


On 01/21/2015 12:45 AM, Dave Airlie wrote:
> On 19 January 2015 at 21:03, Thomas Hellstrom <thellstrom at vmware.com> wrote:
>> Fixes a case where we call vmw_fifo_idle() from within a wait function with
>> task state !TASK_RUNNING, which is illegal.
>>
>> In addition, make the locking fine-grained, so that it is performed once
>> for every read- and write operation. This is of course more costly, but we
>> don't perform much register access in the timing critical paths anyway. Instead
>> we have the extra benefit of being sure that we don't forget the hw lock around
>> register accesses. I think currently the kms code was quite buggy w r t this.
> So what is your feeling on this for -fixes?
>
> Dave.
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