Patch "hdlc_ppp: carrier detect ok, don't turn off negotiation" has been added to the 3.18-stable tree

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

hdlc_ppp: carrier detect ok, don't turn off negotiation

to the 3.18-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:
hdlc_ppp-carrier-detect-ok-don-t-turn-off-negotiation.patch
and it can be found in the queue-3.18 subdirectory.

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

From: Denis Du <[email protected]>
Date: Sat, 24 Feb 2018 16:51:42 -0500
Subject: hdlc_ppp: carrier detect ok, don't turn off negotiation

From: Denis Du <[email protected]>

[ Upstream commit b6c3bad1ba83af1062a7ff6986d9edc4f3d7fc8e ]

Sometimes when physical lines have a just good noise to make the protocol handshaking fail, but the carrier detect still good. Then after remove of the noise, nobody will trigger this protocol to be start again to cause the link to never come back. The fix is when the carrier is still on, not terminate the protocol handshaking.

---
 drivers/net/wan/hdlc_ppp.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

@@ -574,7 +574,10 @@ static void ppp_timer(unsigned long arg)
 			ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0,
 				     0, NULL);
 			proto->restart_counter--;
-		} else
+		} else if (netif_carrier_ok(proto->dev))
+			ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0,
+				     0, NULL);
+		else
 			ppp_cp_event(proto->dev, proto->pid, TO_BAD, 0, 0,
 				     0, NULL);
 		break;

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

queue-3.18/hdlc_ppp-carrier-detect-ok-don-t-turn-off-negotiation.patch