netdev - [PATCH 2/7] hv_netvsc: dev hold/put reference to VF

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Date:   Thu, 22 Sep 2016 16:56:30 -0700
From:   sthemmin@...hange.microsoft.com
To:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, Stephen Hemminger <sthemmin@...rosoft.com>
Subject: [PATCH 2/7] hv_netvsc: dev hold/put reference to VF

From: Stephen Hemminger <sthemmin@...rosoft.com>

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 <sthemmin@...rosoft.com>
---
 drivers/net/hyperv/netvsc_drv.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 2360e70..e74dbcc 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;
 }
-- 
1.7.4.1