From: Zoltan Kiss Date: Thu, 7 Aug 2014 12:38:38 +0000 (+0100) Subject: xen-netback: Fix vif->disable handling X-Git-Tag: firefly_0821_release~176^2~3401^2~43 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=743b0a92b92a0e1b6a68497ccd18a0d60a4b6082;p=firefly-linux-kernel-4.4.55.git xen-netback: Fix vif->disable handling In the patch called "xen-netback: Turn off the carrier if the guest is not able to receive" new branches were introduced to this if statement, risking that a queue with non-zero id can reenable the disabled interface. Signed-off-by: Zoltan Kiss Signed-off-by: David Vrabel Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: xen-devel@lists.xenproject.org Signed-off-by: David S. Miller --- diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index aa2093325be1..4734472aa620 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -2025,9 +2025,15 @@ int xenvif_kthread_guest_rx(void *data) * context so we defer it here, if this thread is * associated with queue 0. */ - if (unlikely(queue->vif->disabled && queue->id == 0)) + if (unlikely(queue->vif->disabled && queue->id == 0)) { xenvif_carrier_off(queue->vif); - else if (unlikely(test_and_clear_bit(QUEUE_STATUS_RX_PURGE_EVENT, + } else if (unlikely(queue->vif->disabled)) { + /* kthread_stop() would be called upon this thread soon, + * be a bit proactive + */ + skb_queue_purge(&queue->rx_queue); + queue->rx_last_skb_slots = 0; + } else if (unlikely(test_and_clear_bit(QUEUE_STATUS_RX_PURGE_EVENT, &queue->status))) { xenvif_rx_purge_event(queue); } else if (!netif_carrier_ok(queue->vif->dev)) {