From: Stephen Hemminger Date: Thu, 22 Sep 2016 23:56:30 +0000 (-0700) Subject: hv_netvsc: dev hold/put reference to VF X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=07d0f0008c783d2a2fce8497000938db15fd7aa1;p=openwrt%2Fstaging%2Fblogic.git hv_netvsc: dev hold/put reference to VF The netvsc driver holds a pointer to the virtual function network device if managing SR-IOV association. In order to ensure that the VF network device does not disappear, it should be using dev_hold/dev_put to get a reference count. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 2360e704e271..e74dbcc2916d 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -1262,6 +1262,8 @@ static int netvsc_register_vf(struct net_device *vf_netdev) * Take a reference on the module. */ try_module_get(THIS_MODULE); + + dev_hold(vf_netdev); net_device_ctx->vf_netdev = vf_netdev; return NOTIFY_OK; } @@ -1376,6 +1378,7 @@ static int netvsc_unregister_vf(struct net_device *vf_netdev) netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name); netvsc_inject_disable(net_device_ctx); net_device_ctx->vf_netdev = NULL; + dev_put(vf_netdev); module_put(THIS_MODULE); return NOTIFY_OK; }