From: Shannon Nelson snelson@pensando.io
[ Upstream commit 976ee3b21119dcf5c6d96233d688a1453f29fa83 ]
The netif_running() test looks at __LINK_STATE_START which gets set before ndo_open() is called, there is a window of time between that and when the queues are actually ready to be run. If ionic_check_link_status() notices that the link is up very soon after netif_running() becomes true, it might try to run the queues before they are ready, causing all manner of potential issues. Since the netdev->flags IFF_UP isn't set until after ndo_open() returns, we can wait for that before we allow ionic_check_link_status() to start the queues.
On the way back to close, __LINK_STATE_START is cleared before calling ndo_stop(), and IFF_UP is cleared after. Both of these need to be true in order to safely stop the queues from ionic_check_link_status().
Fixes: 49d3b493673a ("ionic: disable the queues on link down") Signed-off-by: Shannon Nelson snelson@pensando.io Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/pensando/ionic/ionic_lif.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c +++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c @@ -105,7 +105,7 @@ static void ionic_link_status_check(stru netif_carrier_on(netdev); }
- if (netif_running(lif->netdev)) + if (lif->netdev->flags & IFF_UP && netif_running(lif->netdev)) ionic_start_queues(lif); } else { if (netif_carrier_ok(netdev)) { @@ -113,7 +113,7 @@ static void ionic_link_status_check(stru netif_carrier_off(netdev); }
- if (netif_running(lif->netdev)) + if (lif->netdev->flags & IFF_UP && netif_running(lif->netdev)) ionic_stop_queues(lif); }