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Subject: Re: [PATCH v1] drm/msm: Move fence put to where failure occurs
To:     Chris Wilson <chris@chris-wilson.co.uk>, airlied@linux.ie,
        dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        robdclark@gmail.com
References: <20181101161228.19432-1-robert.foss@collabora.com>
 <154108957570.30246.16686926988338640470@skylake-alporthouse-com>
From:   Robert Foss <robert.foss@collabora.com>
Message-ID: <8153c015-a082-1897-a486-6fe2c5166168@collabora.com>
Date:   Thu, 1 Nov 2018 18:08:11 +0100
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Hey Chris,

On 2018-11-01 17:26, Chris Wilson wrote:
> Quoting Robert Foss (2018-11-01 16:12:28)
>> If dma_fence_wait fails to wait for a supplied in-fence in
>> msm_ioctl_gem_submit, make sure we release that in-fence.
>>
>> Also remove this dma_fence_put() from the 'out' label.
>>
>> Signed-off-by: Robert Foss <robert.foss@collabora.com>
>> ---
>>   drivers/gpu/drm/msm/msm_gem_submit.c | 10 +++++-----
>>   1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
>> index a90aedd6883a..3e7704af5b24 100644
>> --- a/drivers/gpu/drm/msm/msm_gem_submit.c
>> +++ b/drivers/gpu/drm/msm/msm_gem_submit.c
>> @@ -411,7 +411,6 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
>>          struct msm_file_private *ctx = file->driver_priv;
>>          struct msm_gem_submit *submit;
>>          struct msm_gpu *gpu = priv->gpu;
>> -       struct dma_fence *in_fence = NULL;
>>          struct sync_file *sync_file = NULL;
>>          struct msm_gpu_submitqueue *queue;
>>          struct msm_ringbuffer *ring;
>> @@ -444,7 +443,8 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
>>          ring = gpu->rb[queue->prio];
>>   
>>          if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
>> -               in_fence = sync_file_get_fence(args->fence_fd);
>> +               struct dma_fence *in_fence = sync_file_get_fence(
>> +                       args->fence_fd);
>>   
>>                  if (!in_fence)
>>                          return -EINVAL;
>> @@ -455,8 +455,10 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
>>                   */
>>                  if (!dma_fence_match_context(in_fence, ring->fctx->context)) {
>>                          ret = dma_fence_wait(in_fence, true);
>> -                       if (ret)
>> +                       if (ret) {
>> +                               dma_fence_put(in_fence);
>>                                  return ret;
>> +                       }
>>                  }
> 
> Careful, we need to keep the put for the normal path. Maybe,

Good catch, I'll send out a fixed version tomorrow.

> 
> if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
> 	struct dma_fence *in_fence;
> 
> 	in_fence = sync_file_get_fence(args->fence_fd); // keep line breaks natural
> 	if (!in_fence)
> 		return -EINVAL;
> 	
> 	ret = 0;
> 	if (!dma_fence_match_match_context(in_fence, ring->fctx->context)
> 		ret = dma_fence_wait(in_fence, true);
> 	dma_fence_put(in_fence);
> 	if (ret)
> 		return ret;
> }
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