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hv_netvsc: reset vf_inject on VF removal

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We reset vf_inject on VF going down (netvsc_vf_down()) but we don't on
VF removal (netvsc_unregister_vf()) so vf_inject stays 'true' while
vf_netdev is already NULL and we're trying to inject packets into NULL
net device in netvsc_recv_callback() causing kernel to crash.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vitaly Kuznetsov 2016-08-15 17:48:41 +02:00 committed by David S. Miller
parent d072218f21
commit 57c1826b99
1 changed files with 16 additions and 10 deletions
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26
drivers/net/hyperv/netvsc_drv.c
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@ -1205,6 +1205,19 @@ static int netvsc_register_vf(struct net_device *vf_netdev)
return NOTIFY_OK;
}
static void netvsc_inject_enable(struct net_device_context *net_device_ctx)
{
net_device_ctx->vf_inject = true;
}
static void netvsc_inject_disable(struct net_device_context *net_device_ctx)
{
net_device_ctx->vf_inject = false;
/* Wait for currently active users to drain out. */
while (atomic_read(&net_device_ctx->vf_use_cnt) != 0)
udelay(50);
}
static int netvsc_vf_up(struct net_device *vf_netdev)
{
@ -1227,7 +1240,7 @@ static int netvsc_vf_up(struct net_device *vf_netdev)
return NOTIFY_DONE;
netdev_info(ndev, "VF up: %s\n", vf_netdev->name);
net_device_ctx->vf_inject = true;
netvsc_inject_enable(net_device_ctx);
/*
* Open the device before switching data path.
@ -1270,14 +1283,7 @@ static int netvsc_vf_down(struct net_device *vf_netdev)
return NOTIFY_DONE;
netdev_info(ndev, "VF down: %s\n", vf_netdev->name);
net_device_ctx->vf_inject = false;
/*
* Wait for currently active users to
* drain out.
*/
while (atomic_read(&net_device_ctx->vf_use_cnt) != 0)
udelay(50);
netvsc_inject_disable(net_device_ctx);
netvsc_switch_datapath(ndev, false);
netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
rndis_filter_close(netvsc_dev);
@ -1309,7 +1315,7 @@ static int netvsc_unregister_vf(struct net_device *vf_netdev)
if (netvsc_dev == NULL)
return NOTIFY_DONE;
netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
netvsc_inject_disable(net_device_ctx);
net_device_ctx->vf_netdev = NULL;
module_put(THIS_MODULE);
return NOTIFY_OK;