netdev - [PATCH net] net/ibmvnic: Fix RTNL deadlock during device reset

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Message-Id: <1543597148-31521-1-git-send-email-tlfalcon@linux.ibm.com>
Date:   Fri, 30 Nov 2018 10:59:08 -0600
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     netdev@...r.kernel.org
Cc:     Thomas Falcon <tlfalcon@...ux.ibm.com>
Subject: [PATCH net] net/ibmvnic: Fix RTNL deadlock during device reset

Commit a5681e20b541 ("net/ibmnvic: Fix deadlock problem
in reset") made the change to hold the RTNL lock during
driver reset but still calls netdev_notify_peers, which
results in a deadlock. Instead, use call_netdevice_notifiers,
which is functionally the same except that it does not
take the RTNL lock again.

Fixes: a5681e20b541 ("net/ibmnvic: Fix deadlock problem in reset")

Signed-off-by: Thomas Falcon <tlfalcon@...ux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index c0203a0..ed50b8d 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1859,7 +1859,7 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 
 	if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
 	    adapter->reset_reason != VNIC_RESET_CHANGE_PARAM)
-		netdev_notify_peers(netdev);
+		call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, netdev);
 
 	netif_carrier_on(netdev);
 
-- 
1.8.3.1