On Fri, Aug 18, 2023 at 2:09 AM Christian König
wrote:
>
> Am 17.08.23 um 23:37 schrieb Rob Clark:
> > From: Rob Clark
> >
> > If a signal callback releases the sw_sync fence, that will trigger a
> > deadlock as the timeline_fence_release recurses onto the fence->lock
> > (used both for signaling
Am 17.08.23 um 23:37 schrieb Rob Clark:
From: Rob Clark
If a signal callback releases the sw_sync fence, that will trigger a
deadlock as the timeline_fence_release recurses onto the fence->lock
(used both for signaling and the the timeline tree).
To avoid that, temporarily hold an extra refere
From: Rob Clark
If a signal callback releases the sw_sync fence, that will trigger a
deadlock as the timeline_fence_release recurses onto the fence->lock
(used both for signaling and the the timeline tree).
To avoid that, temporarily hold an extra reference to the signalled
fences until after we
Quoting Chris Wilson (2020-07-14 19:30:39)
> Quoting Bas Nieuwenhuizen (2020-07-14 19:17:21)
> > On Tue, Jul 14, 2020 at 6:26 PM Chris Wilson
> > wrote:
> > >
> > > Quoting Bas Nieuwenhuizen (2020-07-14 16:41:02)
> > > > Calltree:
> > > > timeline_fence_release
> > > > drm_sched_entity_wakeup
Quoting Bas Nieuwenhuizen (2020-07-14 19:17:21)
> On Tue, Jul 14, 2020 at 6:26 PM Chris Wilson wrote:
> >
> > Quoting Bas Nieuwenhuizen (2020-07-14 16:41:02)
> > > Calltree:
> > > timeline_fence_release
> > > drm_sched_entity_wakeup
> > > dma_fence_signal_locked
> > > sync_timeline_signal
On Tue, Jul 14, 2020 at 6:26 PM Chris Wilson wrote:
>
> Quoting Bas Nieuwenhuizen (2020-07-14 16:41:02)
> > Calltree:
> > timeline_fence_release
> > drm_sched_entity_wakeup
> > dma_fence_signal_locked
> > sync_timeline_signal
> > sw_sync_ioctl
> >
> > Releasing the reference to the fence
Quoting Bas Nieuwenhuizen (2020-07-14 16:41:02)
> Calltree:
> timeline_fence_release
> drm_sched_entity_wakeup
> dma_fence_signal_locked
> sync_timeline_signal
> sw_sync_ioctl
>
> Releasing the reference to the fence in the fence signal callback
> seems reasonable to me, so this patch av
Calltree:
timeline_fence_release
drm_sched_entity_wakeup
dma_fence_signal_locked
sync_timeline_signal
sw_sync_ioctl
Releasing the reference to the fence in the fence signal callback
seems reasonable to me, so this patch avoids the locking issue in
sw_sync.
d3862e44daa7 ("dma-buf/sw-sync
