Hi Chris,
2017-07-28 Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>:
> Up until recently sync_file were create to export a single dma-fence to
> userspace, and so we could canabalise a bit insie dma-fence to mark
> whether or not we had enable polling for the sync_file itself. However,
> with the advent of syncobj, we do allow userspace to create multiple
> sync_files for a single dma-fence. (Similarly, that the sw-sync
> validation framework also started returning multiple sync-files wrapping
> a single dma-fence for a syncpt also triggering the problem.)
>
> This patch reverts my suggestion in commit e24165537312
> ("dma-buf/sync_file: only enable fence signalling on poll()") to use a
> single bit in the shared dma-fence and restores the sync_file->flags for
> tracking the bits individually.
>
> Reported-by: Gustavo Padovan <gustavo@xxxxxxxxxxx>
> Fixes: f1e8c67123cf ("dma-buf/sw-sync: Use an rbtree to sort fences in the timeline")
> Fixes: e9083420bbac ("drm: introduce sync objects (v4)")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
> Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: <drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx> # v4.13-rc1+
> ---
> drivers/dma-buf/sync_file.c | 5 +++--
> include/linux/sync_file.h | 3 ++-
> 2 files changed, 5 insertions(+), 3 deletions(-)
I confirm the patch fixes the sync kselftests for me. Pushed to
drm-misc-next.
Gustavo
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