[Intel-gfx] [PATCH] drm/atomic: Call ww_acquire_done after drm_modeset_lock_all

[Harry Wentland]

On 2018-02-21 01:36 PM, Daniel Vetter wrote:
> On Wed, Feb 21, 2018 at 04:23:31PM +0100, Maarten Lankhorst wrote:
>> After we acquired all generic modeset locks in drm_modeset_lock_all, it's
>> unsafe acquire any other so just mark acquisition as done.
>>
>> Atomic drivers shouldn't use drm_modeset_lock_all.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> 
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> 
> Also, I'm pretty much expecting to regret this like all the other
> ww_acquire_done patches I've acked, but where's the fun in not trying :-)
> 

This shouldn't really hurt anything, other than throw DEBUG warnings if DEBUG_MUTEXES is on.

Acked-by: Harry Wentland <harry.wentland at amd.com>

Harry

> Cheers, Daniel
> 
>> ---
>>  drivers/gpu/drm/drm_modeset_lock.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
>> index 963e23db0fe7..8a5100685875 100644
>> --- a/drivers/gpu/drm/drm_modeset_lock.c
>> +++ b/drivers/gpu/drm/drm_modeset_lock.c
>> @@ -113,6 +113,7 @@ void drm_modeset_lock_all(struct drm_device *dev)
>>  		kfree(ctx);
>>  		return;
>>  	}
>> +	ww_acquire_done(&ctx->ww_ctx);
>>  
>>  	WARN_ON(config->acquire_ctx);
>>  
>> -- 
>> 2.16.1
>>
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>