[PATCH v2] sync_file: Return consistent status in SYNC_IOC_FILE_INFO

[Gustavo Padovan]

2017-10-09 Chris Wilson <chris at chris-wilson.co.uk>:

> Quoting John Einar Reitan (2017-10-09 14:49:36)
> > sync_file_ioctl_fence_info has a race between filling the status
> > of the underlying fences and the overall status of the sync_file.
> > If fence transitions in the time frame between its sync_fill_fence_info
> > and the later dma_fence_is_signaled for the sync_file, the returned
> > information is inconsistent showing non-signaled underlying fences but
> > an overall signaled state.
> > 
> > This patch changes sync_file_ioctl_fence_info to track what has been
> > encoded and using that as the overall sync_file status.
> > 
> > Tested-by: Vamsidhar Reddy Gaddam <vamsidhar.gaddam at arm.com>
> > Signed-off-by: John Einar Reitan <john.reitan at arm.com>
> > Cc: Sumit Semwal <sumit.semwal at linaro.org>
> > Cc: Gustavo Padovan <gustavo at padovan.org>
> > Cc: dri-devel at lists.freedesktop.org
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

Pushed to drm-misc-fixes.

Gustavo