hw/nvme: skip queue processing if notifier is cleared

While it is safe to process the queues when they are empty, skip it if
the event notifier callback was invoked spuriously.

Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Jinhao Fan <fanjinhao21s@ict.ac.cn>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 533ad14e7a..8aa73b048d 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -4238,7 +4238,9 @@ static void nvme_cq_notifier(EventNotifier *e)
     NvmeCQueue *cq = container_of(e, NvmeCQueue, notifier);
     NvmeCtrl *n = cq->ctrl;
 
-    event_notifier_test_and_clear(&cq->notifier);
+    if (!event_notifier_test_and_clear(e)) {
+        return;
+    }
 
     nvme_update_cq_head(cq);
 
@@ -4275,7 +4277,9 @@ static void nvme_sq_notifier(EventNotifier *e)
 {
     NvmeSQueue *sq = container_of(e, NvmeSQueue, notifier);
 
-    event_notifier_test_and_clear(&sq->notifier);
+    if (!event_notifier_test_and_clear(e)) {
+        return;
+    }
 
     nvme_process_sq(sq);
 }