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@xxxxxxxxxxxxxxxxxx>
---
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);
--
2.20.1
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