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dma-buf/sw_sync: force signal all unsignaled fences on dying timeline 

To avoid hanging userspace components that might have been waiting on the
active fences of the destroyed timeline we need to signal with error all
remaining fences on such timeline.

This restore the default behaviour of the Android sw_sync framework, which
Android still relies on. It was broken on the dma fence conversion a few
years ago and never fixed.

v2: Do not bother with cleanup do the list (Chris Wilson)

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dominik Behr <dbehr@chromium.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170907190246.16425-2-gustavo@padovan.org
hifive-unleashed-5.1
Dominik Behr 2017-09-07 16:02:46 -03:00 committed by Gustavo Padovan
parent 5663077a56
commit ea4d5a270b
1 changed files with 9 additions and 1 deletions
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10
drivers/dma-buf/sw_sync.c
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@ -321,8 +321,16 @@ static int sw_sync_debugfs_open(struct inode *inode, struct file *file)
static int sw_sync_debugfs_release(struct inode *inode, struct file *file)
{
struct sync_timeline *obj = file->private_data;
struct sync_pt *pt, *next;
smp_wmb();
spin_lock_irq(&obj->lock);
list_for_each_entry_safe(pt, next, &obj->pt_list, link) {
dma_fence_set_error(&pt->base, -ENOENT);
dma_fence_signal_locked(&pt->base);
}
spin_unlock_irq(&obj->lock);
sync_timeline_put(obj);
return 0;