Patch "IB/hfi1: Check for QSFP presence before attempting reads" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

IB/hfi1: Check for QSFP presence before attempting reads

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ib-hfi1-check-for-qsfp-presence-before-attempting-reads.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Easwar Hariharan <[email protected]>
Date: Mon, 20 Mar 2017 17:25:42 -0700
Subject: IB/hfi1: Check for QSFP presence before attempting reads

From: Easwar Hariharan <[email protected]>

[ Upstream commit fb897ad315643e5dc1092a115b3cec914b66df9d ]

Attempting to read the status of a QSFP cable creates noise in the logs and misses out on setting an appropriate Offline/Disabled Reason if the cable is not plugged in. Check for this prior to attempting the read and attendant retries.

---
 drivers/infiniband/hw/hfi1/chip.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

@@ -9489,8 +9489,11 @@ static int test_qsfp_read(struct hfi1_pp
 	int ret;
 	u8 status;
 
-	/* report success if not a QSFP */
-	if (ppd->port_type != PORT_TYPE_QSFP)
+	/*
+	 * Report success if not a QSFP or, if it is a QSFP, but the cable is
+	 * not present
+	 */
+	if (ppd->port_type != PORT_TYPE_QSFP || !qsfp_mod_present(ppd))
 		return 0;
 
 	/* read byte 2, the status byte */

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/ib-hfi1-check-for-qsfp-presence-before-attempting-reads.patch