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:
<ch2pr18mb31898e033896f9760d36bff288...@ch2pr18mb3189.namprd18.prod.outlook.com>
Signed-off-by: Benjamin Poirier <bpoir...@suse.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
