[PATCH 4.19 87/89] net/smc: cancel event worker during device removal

[Greg Kroah-Hartman]

From: Karsten Graul <kgraul@xxxxxxxxxxxxx>

commit ece0d7bd74615773268475b6b64d6f1ebbd4b4c6 upstream.

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@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Karsten Graul <kgraul@xxxxxxxxxxxxx>
Reviewed-by: Ursula Braun <ubraun@xxxxxxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/smc/smc_ib.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -561,6 +561,7 @@ static void smc_ib_remove_dev(struct ib_
 	smc_pnet_remove_by_ibdev(smcibdev);
 	smc_ib_cleanup_per_ibdev(smcibdev);
 	ib_unregister_event_handler(&smcibdev->event_handler);
+	cancel_work_sync(&smcibdev->port_event_work);
 	kfree(smcibdev);
 }