linux-kernel - Re: [PATCH v2] drm/virtio: exbuf->fence

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Date:   Mon, 6 Feb 2023 20:20:46 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Ryan Neph <ryanneph@...omium.org>,
        David Airlie <airlied@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     Yiwei Zhang <zzyiwei@...omium.org>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Emil Velikov <emil.velikov@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>
Subject: Re: [PATCH v2] drm/virtio: exbuf->fence_fd unmodified on interrupted
 wait

On 2/4/23 02:33, Ryan Neph wrote:
> An interrupted dma_fence_wait() becomes an -ERESTARTSYS returned
> to userspace ioctl(DRM_IOCTL_VIRTGPU_EXECBUFFER) calls, prompting to
> retry the ioctl(), but the passed exbuf->fence_fd has been reset to -1,
> making the retry attempt fail at sync_file_get_fence().
> 
> The uapi for DRM_IOCTL_VIRTGPU_EXECBUFFER is changed to retain the
> passed value for exbuf->fence_fd when returning anything besides a
> successful result from the ioctl.
> 
> Fixes: 2cd7b6f08bc4 ("drm/virtio: add in/out fence support for explicit synchronization")
> Signed-off-by: Ryan Neph <ryanneph@...omium.org>
> Reviewed-by: Rob Clark <robdclark@...il.com>
> Reviewed-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> 
> ---
> 
> Changes in v2:
> - No longer modifies exbuf->fence_fd unless DRM_IOCTL_VIRTGPU_EXECBUFFER
>   succeeds.
> - Added r-b tags (Rob/Dmitry) from v1.

Thanks! Applied to misc-fixes

-- 
Best regards,
Dmitry