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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-05-13 13:55:21 +0200
committerDavid S. Miller <davem@davemloft.net>2016-05-16 13:26:00 -0400
commit1bdcec8a5f05445752a0639edd603ac09ae6c553 (patch)
tree09c637dad4d6a3a111646b5354c1a1852c3fa581
parentf580aec4bfd7babe51f086e599400027def08ed8 (diff)
hv_netvsc: use start_remove flag to protect netvsc_link_change()
netvsc_link_change() can race with netvsc_change_mtu() or netvsc_set_channels() as these functions destroy struct netvsc_device and rndis filter. Use start_remove flag for syncronization. As netvsc_change_mtu()/netvsc_set_channels() are called with rtnl lock held we need to take it before checking start_remove value in netvsc_link_change(). Reported-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/hyperv/netvsc_drv.c21
1 files changed, 17 insertions, 4 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index b3fa2cdcb3f6..01de2dcef170 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -838,6 +838,8 @@ static int netvsc_set_channels(struct net_device *net,
out:
netvsc_open(net);
net_device_ctx->start_remove = false;
+ /* We may have missed link change notifications */
+ schedule_delayed_work(&net_device_ctx->dwork, 0);
return ret;
@@ -946,6 +948,9 @@ out:
netvsc_open(ndev);
ndevctx->start_remove = false;
+ /* We may have missed link change notifications */
+ schedule_delayed_work(&ndevctx->dwork, 0);
+
return ret;
}
@@ -1066,6 +1071,11 @@ static void netvsc_link_change(struct work_struct *w)
unsigned long flags, next_reconfig, delay;
ndev_ctx = container_of(w, struct net_device_context, dwork.work);
+
+ rtnl_lock();
+ if (ndev_ctx->start_remove)
+ goto out_unlock;
+
net_device = hv_get_drvdata(ndev_ctx->device_ctx);
rdev = net_device->extension;
net = net_device->ndev;
@@ -1079,7 +1089,7 @@ static void netvsc_link_change(struct work_struct *w)
delay = next_reconfig - jiffies;
delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
schedule_delayed_work(&ndev_ctx->dwork, delay);
- return;
+ goto out_unlock;
}
ndev_ctx->last_reconfig = jiffies;
@@ -1093,9 +1103,7 @@ static void netvsc_link_change(struct work_struct *w)
spin_unlock_irqrestore(&ndev_ctx->lock, flags);
if (!event)
- return;
-
- rtnl_lock();
+ goto out_unlock;
switch (event->event) {
/* Only the following events are possible due to the check in
@@ -1144,6 +1152,11 @@ static void netvsc_link_change(struct work_struct *w)
*/
if (reschedule)
schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
+
+ return;
+
+out_unlock:
+ rtnl_unlock();
}
static void netvsc_free_netdev(struct net_device *netdev)