linux-kernel - Re: [RESEND PATCH v3] drm/msm: Move fence put to where failure occurs

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Message-ID: <CAF6AEGt+SJPoTChr=zn+g8Vth_F_D39EmWGXpo3qbsUgL=638A@mail.gmail.com>
Date:   Tue, 4 Dec 2018 15:21:35 -0500
From:   Rob Clark <robdclark@...il.com>
To:     Robert Foss <robert.foss@...labora.com>
Cc:     David Airlie <airlied@...ux.ie>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Greg KH <gregkh@...uxfoundation.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [RESEND PATCH v3] drm/msm: Move fence put to where failure occurs

On Tue, Dec 4, 2018 at 11:56 AM Robert Foss <robert.foss@...labora.com> wrote:
>
> 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@...labora.com>
> Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: stable@...r.kernel.org

Fyi, this is queued up in msm-next/fixes

BR,
-R


> ---
>  drivers/gpu/drm/msm/msm_gem_submit.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
> index a90aedd6883a..d5e6665a4c8f 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;
> @@ -444,6 +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) {
> +               struct dma_fence *in_fence;
> +
>                 in_fence = sync_file_get_fence(args->fence_fd);
>
>                 if (!in_fence)
> @@ -453,11 +454,13 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
>                  * Wait if the fence is from a foreign context, or if the fence
>                  * array contains any fence from a foreign context.
>                  */
> -               if (!dma_fence_match_context(in_fence, ring->fctx->context)) {
> +               ret = 0;
> +               if (!dma_fence_match_context(in_fence, ring->fctx->context))
>                         ret = dma_fence_wait(in_fence, true);
> -                       if (ret)
> -                               return ret;
> -               }
> +
> +               dma_fence_put(in_fence);
> +               if (ret)
> +                       return ret;
>         }
>
>         ret = mutex_lock_interruptible(&dev->struct_mutex);
> @@ -583,8 +586,6 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
>         }
>
>  out:
> -       if (in_fence)
> -               dma_fence_put(in_fence);
>         submit_cleanup(submit);
>         if (ret)
>                 msm_gem_submit_free(submit);
> --
> 2.17.1
>