From: Chris Wilson chris@chris-wilson.co.uk
The name very often may be freed independently of the fence, with the only protection being RCU. To be safe as we read the names, hold RCU.
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Reviewed-by: Mika Kuoppala mika.kuoppala@linux.intel.com Signed-off-by: Tvrtko Ursulin tvrtko.ursulin@intel.com --- drivers/gpu/drm/i915/i915_sw_fence.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c index 2744558f3050..dfabf291e5cd 100644 --- a/drivers/gpu/drm/i915/i915_sw_fence.c +++ b/drivers/gpu/drm/i915/i915_sw_fence.c @@ -430,11 +430,13 @@ static void timer_i915_sw_fence_wake(struct timer_list *t) if (!fence) return;
+ rcu_read_lock(); pr_notice("Asynchronous wait on fence %s:%s:%llx timed out (hint:%ps)\n", cb->dma->ops->get_driver_name(cb->dma), cb->dma->ops->get_timeline_name(cb->dma), cb->dma->seqno, i915_sw_fence_debug_hint(fence)); + rcu_read_unlock();
i915_sw_fence_set_error_once(fence, -ETIMEDOUT); i915_sw_fence_complete(fence);