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net/hyperv: Adding cancellation to ensure rndis filter is closed

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Although the network interface is down, the RX packets number which
could be observed by ifconfig may keep on increasing.

This is because the WORK scheduled in netvsc_set_multicast_list()
may be executed after netvsc_close(). That means the rndis filter
may be re-enabled by do_set_multicast() even if it was closed by
netvsc_close().

By canceling possible WORK before close the rndis filter, the issue
could be never happened.

Signed-off-by: Wenqi Ma <wenqi_ma@trendmicro.com.cn>
Reviewed-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wenqi Ma 2012-04-19 00:39:37 +00:00 committed by David S. Miller
parent c5a99937a9
commit 792df87228
1 changed files with 14 additions and 24 deletions
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38
drivers/net/hyperv/netvsc_drv.c
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@ -44,6 +44,7 @@ struct net_device_context {
/* point back to our device context */
struct hv_device *device_ctx;
struct delayed_work dwork;
struct work_struct work;
};
@ -51,30 +52,22 @@ static int ring_size = 128;
module_param(ring_size, int, S_IRUGO);
MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
struct set_multicast_work {
struct work_struct work;
struct net_device *net;
};
static void do_set_multicast(struct work_struct *w)
{
struct set_multicast_work *swk =
container_of(w, struct set_multicast_work, work);
struct net_device *net = swk->net;
struct net_device_context *ndevctx = netdev_priv(net);
struct net_device_context *ndevctx =
container_of(w, struct net_device_context, work);
struct netvsc_device *nvdev;
struct rndis_device *rdev;
nvdev = hv_get_drvdata(ndevctx->device_ctx);
if (nvdev == NULL)
goto out;
if (nvdev == NULL || nvdev->ndev == NULL)
return;
rdev = nvdev->extension;
if (rdev == NULL)
goto out;
return;
if (net->flags & IFF_PROMISC)
if (nvdev->ndev->flags & IFF_PROMISC)
rndis_filter_set_packet_filter(rdev,
NDIS_PACKET_TYPE_PROMISCUOUS);
else
@ -82,21 +75,13 @@ static void do_set_multicast(struct work_struct *w)
NDIS_PACKET_TYPE_BROADCAST |
NDIS_PACKET_TYPE_ALL_MULTICAST |
NDIS_PACKET_TYPE_DIRECTED);
out:
kfree(w);
}
static void netvsc_set_multicast_list(struct net_device *net)
{
struct set_multicast_work *swk =
kmalloc(sizeof(struct set_multicast_work), GFP_ATOMIC);
if (swk == NULL)
return;
struct net_device_context *net_device_ctx = netdev_priv(net);
swk->net = net;
INIT_WORK(&swk->work, do_set_multicast);
schedule_work(&swk->work);
schedule_work(&net_device_ctx->work);
}
static int netvsc_open(struct net_device *net)
@ -125,6 +110,8 @@ static int netvsc_close(struct net_device *net)
netif_tx_disable(net);
/* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
cancel_work_sync(&net_device_ctx->work);
ret = rndis_filter_close(device_obj);
if (ret != 0)
netdev_err(net, "unable to close device (ret %d).\n", ret);
@ -335,6 +322,7 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu)
nvdev->start_remove = true;
cancel_delayed_work_sync(&ndevctx->dwork);
cancel_work_sync(&ndevctx->work);
netif_tx_disable(ndev);
rndis_filter_device_remove(hdev);
@ -403,6 +391,7 @@ static int netvsc_probe(struct hv_device *dev,
net_device_ctx->device_ctx = dev;
hv_set_drvdata(dev, net);
INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
INIT_WORK(&net_device_ctx->work, do_set_multicast);
net->netdev_ops = &device_ops;
@ -456,6 +445,7 @@ static int netvsc_remove(struct hv_device *dev)
ndev_ctx = netdev_priv(net);
cancel_delayed_work_sync(&ndev_ctx->dwork);
cancel_work_sync(&ndev_ctx->work);
/* Stop outbound asap */
netif_tx_disable(net);