Hello Thomas
>> +    if (!context_valid)
>> +            return 0;
>>  
>>      via_release_futex(dev_priv, context);
> When is this function called with an invalid context? Could you describe 
> what error you are seeing.

There are some bugs in the DDMPEG(a user mode library realizing decode driver) 
before, which destroy his context more than once, it was the behavior causes 
DRM segment fault. We add this patch for enhancing DRM robustness, although it 
is DDMPEG's fault.

Thanks and Best Regards
=================================================
Bruce C. Chang(張祖明)
VIA Technologies, Inc. 
Address: 1F, 531, Chung-Cheng Road, Hsin-Tien, 231 Taipei
Tel: +886-2-22185452 Ext 7323
Mobile: +886-968343824
Fax: +886-2-22186282
Skype: Bruce.C.Chang
Email: brucech...@via.com.tw
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