VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Nick Child <nnac123@linux.ibm.com> 2023-06-28 13:22:44 -0500 committer: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2023-07-19 16:36:44 +0200 commit: 91a0632e73070928aafeb36b3cc676843c716931 parent: 048b241b7f5f318e4eca6a42e64d650dbe6359c3
Commit Summary:
ibmvnic: Do not reset dql stats on NON_FATAL err
Diffstat:
1 file changed, 8 insertions, 1 deletion
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index c63d3ec9d328..763d613adbcc 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1816,7 +1816,14 @@ static int __ibmvnic_open(struct net_device *netdev)
 		if (prev_state == VNIC_CLOSED)
 			enable_irq(adapter->tx_scrq[i]->irq);
 		enable_scrq_irq(adapter, adapter->tx_scrq[i]);
-		netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
+		/* netdev_tx_reset_queue will reset dql stats. During NON_FATAL
+		 * resets, don't reset the stats because there could be batched
+		 * skb's waiting to be sent. If we reset dql stats, we risk
+		 * num_completed being greater than num_queued. This will cause
+		 * a BUG_ON in dql_completed().
+		 */
+		if (adapter->reset_reason != VNIC_RESET_NON_FATAL)
+			netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
 	}
 
 	rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);