From: Karsten Graul <kgraul@linux.ibm.com>
Date: Tue, 10 Mar 2020 09:33:30 +0100
Subject: net/smc: cancel event worker during device removal
Git-commit: ece0d7bd74615773268475b6b64d6f1ebbd4b4c6
Patch-mainline: v5.6-rc6
References: git-fixes

During IB device removal, cancel the event worker before the device
structure is freed.

Fixes: a4cf0443c414 ("smc: introduce SMC as an IB-client")
Reported-by: syzbot+b297c6825752e7a07272@syzkaller.appspotmail.com
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/smc_ib.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -568,6 +568,7 @@ static void smc_ib_remove_dev(struct ib_
 	spin_unlock(&smc_ib_devices.lock);
 	smc_ib_cleanup_per_ibdev(smcibdev);
 	ib_unregister_event_handler(&smcibdev->event_handler);
+	cancel_work_sync(&smcibdev->port_event_work);
 	kfree(smcibdev);
 }