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From: Jim Harris <jimharris@FreeBSD.org>
Date: Tue, 9 Jul 2013 21:03:40 +0000 (UTC)
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Subject: svn commit: r253108 - head/sys/dev/nvme
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Author: jimharris
Date: Tue Jul  9 21:03:39 2013
New Revision: 253108
URL: http://svnweb.freebsd.org/changeset/base/253108

Log:
  Do not retry failed async event requests.
  
  Sponsored by:	Intel
  MFC after:	3 days

Modified:
  head/sys/dev/nvme/nvme_ctrlr.c

Modified: head/sys/dev/nvme/nvme_ctrlr.c
==============================================================================
--- head/sys/dev/nvme/nvme_ctrlr.c	Tue Jul  9 21:02:45 2013	(r253107)
+++ head/sys/dev/nvme/nvme_ctrlr.c	Tue Jul  9 21:03:39 2013	(r253108)
@@ -649,12 +649,12 @@ nvme_ctrlr_async_event_cb(void *arg, con
 {
 	struct nvme_async_event_request	*aer = arg;
 
-	if (cpl->status.sc == NVME_SC_ABORTED_SQ_DELETION) {
+	if (nvme_completion_is_error(cpl)) {
 		/*
-		 *  This is simulated when controller is being shut down, to
-		 *  effectively abort outstanding asynchronous event requests
-		 *  and make sure all memory is freed.  Do not repost the
-		 *  request in this case.
+		 *  Do not retry failed async event requests.  This avoids
+		 *  infinite loops where a new async event request is submitted
+		 *  to replace the one just failed, only to fail again and
+		 *  perpetuate the loop.
 		 */
 		return;
 	}