netdev - [PATCH net] be2net: Synchronize be_update_queues with dev

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Message-Id: <20190718014218.16610-1-bpoirier@suse.com>
Date:   Thu, 18 Jul 2019 10:42:18 +0900
From:   Benjamin Poirier <bpoirier@...e.com>
To:     David Miller <davem@...emloft.net>
Cc:     Sathya Perla <sathya.perla@...adcom.com>,
        Ajit Khaparde <ajit.khaparde@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Firo Yang <fyang@...e.com>,
        Saeed Mahameed <saeedm@...lanox.com>, netdev@...r.kernel.org
Subject: [PATCH net] be2net: Synchronize be_update_queues with dev_watchdog

As pointed out by Firo Yang, a netdev tx timeout may trigger just before an
ethtool set_channels operation is started. be_tx_timeout(), which dumps
some queue structures, is not written to run concurrently with
be_update_queues(), which frees/allocates those queues structures. Add some
synchronization between the two.

Message-id: <CH2PR18MB31898E033896F9760D36BFF288C90@...PR18MB3189.namprd18.prod.outlook.com>
Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
---
 drivers/net/ethernet/emulex/benet/be_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index b7a246b33599..2edb86ec9fe9 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -4698,8 +4698,13 @@ int be_update_queues(struct be_adapter *adapter)
 	int status;
 
 	if (netif_running(netdev)) {
+		/* be_tx_timeout() must not run concurrently with this
+		 * function, synchronize with an already-running dev_watchdog
+		 */
+		netif_tx_lock_bh(netdev);
 		/* device cannot transmit now, avoid dev_watchdog timeouts */
 		netif_carrier_off(netdev);
+		netif_tx_unlock_bh(netdev);
 
 		be_close(netdev);
 	}
-- 
2.22.0