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

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[ Upstream commit b6c3bad1ba ]

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.

Signed-off-by: Denis Du <dudenis2000@yahoo.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis Du 2018-02-24 16:51:42 -05:00 committed by Greg Kroah-Hartman
parent def37b7db3
commit 188633598e
1 changed files with 4 additions and 1 deletions
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5
drivers/net/wan/hdlc_ppp.c
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@ -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;