linux-kernel - [PATCH 4.14 236/496] hv_netvsc: fix locking during VF setup

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Message-Id: <20180528100329.847535404@linuxfoundation.org>
Date:   Mon, 28 May 2018 12:00:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stephen Hemminger <sthemmin@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 236/496] hv_netvsc: fix locking during VF setup

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Hemminger <stephen@...workplumber.org>

[ Upstream commit b0dee7910317f41f398838992516af6a3b981d86 ]

The dev_uc/mc_sync calls need to have the device address list
locked. This was spotted by running with lockdep enabled.

Fixes: bee9d41b37ea ("hv_netvsc: propagate rx filters to VF")
Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/hyperv/netvsc_drv.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1848,8 +1848,12 @@ static void __netvsc_vf_setup(struct net
 
 	/* set multicast etc flags on VF */
 	dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE);
+
+	/* sync address list from ndev to VF */
+	netif_addr_lock_bh(ndev);
 	dev_uc_sync(vf_netdev, ndev);
 	dev_mc_sync(vf_netdev, ndev);
+	netif_addr_unlock_bh(ndev);
 
 	if (netif_running(ndev)) {
 		ret = dev_open(vf_netdev);