On Wed, Jul 06, 2016 at 08:45:57AM +0100, Chris Wilson wrote: > After assigning ourselves as the new bottom-half, we must perform a > cursory check to prevent a missed interrupt. Either we miss the interrupt > whilst programming the hardware, or if there was a previous waiter (for > a later seqno) they may be woken instead of us (due to the inherent race > in the unlocked read of b->tasklet in the irq handler) and so we miss the > wake up. > > Spotted-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96806 > Fixes: 688e6c725816 ("drm/i915: Slaughter the thundering... herd") > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> > Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
