From fac0105a5c9f0a2e93f071b7373900e53afae9f8 Mon Sep 17 00:00:00 2001 From: Sukadev Bhattiprolu Date: Fri, 29 Oct 2021 15:03:14 -0700 Subject: [PATCH] ibmvnic: don't stop queue in xmit [ Upstream commit 8878e46fcfd46b19964bd90e13b25dd94cbfc9be ] If adapter's resetting bit is on, discard the packet but don't stop the transmit queue - instead leave that to the reset code. With this change, it is possible that we may get several calls to ibmvnic_xmit() that simply discard packets and return. But if we stop the queue here, we might end up doing so just after __ibmvnic_open() started the queues (during a hard/soft reset) and before the ->resetting bit was cleared. If that happens, there will be no one to restart queue and transmissions will be blocked indefinitely. This can cause a TIMEOUT reset and with auto priority failover enabled, an unnecessary FAILOVER reset to less favored backing device and then a FAILOVER back to the most favored backing device. If we hit the window repeatedly, we can get stuck in a loop of TIMEOUT, FAILOVER, FAILOVER resets leaving the adapter unusable for extended periods of time. Fixes: 7f5b030830fe ("ibmvnic: Free skb's in cases of failure in transmit") Reported-by: Abdul Haleem Reported-by: Vaishnavi Bhat Signed-off-by: Sukadev Bhattiprolu Reviewed-by: Dany Madden Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/ibm/ibmvnic.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 6aa6ff8..7438138 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -1724,8 +1724,6 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) ind_bufp = &tx_scrq->ind_buf; if (test_bit(0, &adapter->resetting)) { - if (!netif_subqueue_stopped(netdev, skb)) - netif_stop_subqueue(netdev, queue_num); dev_kfree_skb_any(skb); tx_send_failed++; -- 2.7.4