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xen-netback: protect resource cleaning on XenBus disconnect

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vif->lock is used to protect statistics gathering agents from using the
queue structure during cleaning.

Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Igor Druzhinin
2017-01-17 20:49:38 +00:00
committed by David S. Miller
parent 9a6cdf52b8
commit f16f1df65f
2 changed files with 6 additions and 2 deletions
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2
drivers/net/xen-netback/xenbus.c
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@@ -503,9 +503,11 @@ static void backend_disconnect(struct backend_info *be)
for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index)
xenvif_deinit_queue(&be->vif->queues[queue_index]);
spin_lock(&be->vif->lock);
vfree(be->vif->queues);
be->vif->num_queues = 0;
be->vif->queues = NULL;
spin_unlock(&be->vif->lock);
xenvif_disconnect_ctrl(be->vif);
}