[PATCH] drm/radeon: fix irq ring buffer overflow handling

[Christian König]

Am 23.07.2014 11:07, schrieb Michel Dänzer:
> On 23.07.2014 16:47, Christian König wrote:
>> From: Christian König <christian.koenig at amd.com>
>>
>> We must mask out the overflow bit as well, otherwise
>> the wptr will never match the rptr again and the interrupt
>> handler will loop forever.
>>
>> Signed-off-by: Christian König <christian.koenig at amd.com>
> Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>
>
>
>> Cc: stable at vger.kernel.org
> Not sure this is justified though. Were you able to reproduce the
> problem and verify the fix?
Not yet, reproducing ring buffer overflows aren't easy to do.  But I've 
had that multiple times with CIK and userptr support work and I can try 
if I can reproduce it once more.

 From reading the code it looks like a rather fundamental problem to me 
and because of this I've added the stable Cc.

Christian.