From: Shannon Nelson <[email protected]>
[ 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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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);
}
