From: Karsten Graul <kgraul@linux.ibm.com>
Date: Sat, 18 Jul 2020 13:06:10 +0000 (+0200)
Subject: net/smc: clear link during SMC client link down processing
X-Git-Tag: v5.15~3334^2~49^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=68fd8942038f30dbb64a594dc15d9948289de42a;p=platform%2Fkernel%2Flinux-starfive.git

net/smc: clear link during SMC client link down processing

In a link-down condition we notify the SMC server and expect that the
server will finally trigger the link clear processing on the client
side. This could fail when anything along this notification path goes
wrong. Clear the link as part of SMC client link-down processing to
prevent dangling links.

Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Fixes: 541afa10c126 ("net/smc: add smcr_port_err() and smcr_link_down() processing")
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index f69d205..e286b3c 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1204,10 +1204,12 @@ static void smcr_link_down(struct smc_link *lnk)
 				SMC_LLC_WAIT_TIME);
 			mutex_lock(&lgr->llc_conf_mutex);
 		}
-		if (!list_empty(&lgr->list))
+		if (!list_empty(&lgr->list)) {
 			smc_llc_send_delete_link(to_lnk, del_link_id,
 						 SMC_LLC_REQ, true,
 						 SMC_LLC_DEL_LOST_PATH);
+			smcr_link_clear(lnk, true);
+		}
 		wake_up(&lgr->llc_flow_waiter);	/* wake up next waiter */
 	}
 }