Patch "bonding: make speed, duplex setting consistent with link state" 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

bonding: make speed, duplex setting consistent with link state

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:
bonding-make-speed-duplex-setting-consistent-with-link-state.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: Mahesh Bandewar <[email protected]>
Date: Mon, 27 Mar 2017 11:37:35 -0700
Subject: bonding: make speed, duplex setting consistent with link state

From: Mahesh Bandewar <[email protected]>

[ Upstream commit c4adfc822bf5d8e97660b6114b5a8892530ce8cb ]

bond_update_speed_duplex() retrieves speed and duplex settings. There is a possibility of failure in retrieving these values but caller has to assume it's always successful. This leads to having inconsistent slave link settings. If these (speed, duplex) values cannot be retrieved, then keeping the link UP causes problems.

The updated bond_update_speed_duplex() returns 0 on success if it retrieves sane values for speed and duplex. On failure it returns 1 and marks the link down.

---
 drivers/net/bonding/bond_main.c |   24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

@@ -371,9 +371,10 @@ down:
 /* Get link speed and duplex from the slave's base driver
  * using ethtool. If for some reason the call fails or the
  * values are invalid, set speed and duplex to -1,
- * and return.
+ * and return. Return 1 if speed or duplex settings are
+ * UNKNOWN; 0 otherwise.
  */
-static void bond_update_speed_duplex(struct slave *slave)
+static int bond_update_speed_duplex(struct slave *slave)
 {
 	struct net_device *slave_dev = slave->dev;
 	struct ethtool_link_ksettings ecmd;

@@ -383,24 +384,27 @@ static void bond_update_speed_duplex(str
 	slave->duplex = DUPLEX_UNKNOWN;
 
 	res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
-	if (res < 0)
-		return;
-
-	if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
-		return;
-
+	if (res < 0) {
+		slave->link = BOND_LINK_DOWN;
+		return 1;
+	}
+	if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) {
+		slave->link = BOND_LINK_DOWN;
+		return 1;
+	}
 	switch (ecmd.base.duplex) {
 	case DUPLEX_FULL:
 	case DUPLEX_HALF:
 		break;
 	default:
-		return;
+		slave->link = BOND_LINK_DOWN;
+		return 1;
 	}
 
 	slave->speed = ecmd.base.speed;
 	slave->duplex = ecmd.base.duplex;
 
-	return;
+	return 0;
 }
 
 const char *bond_slave_link_status(s8 link)

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

queue-4.9/bonding-make-speed-duplex-setting-consistent-with-link-state.patch queue-4.9/ipvlan-add-l2-check-for-packets-arriving-via-virtual-devices.patch