linux-kernel - [PATCH 4.17 270/324] hv/netvsc: fix handling of fallback to single queue mode

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Message-Id: <20180823075009.474043266@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:55:36 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 270/324] hv/netvsc: fix handling of fallback to single queue mode

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

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

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

[ Upstream commit 916c5e1413be058d1c1f6e502db350df890730ce ]

The netvsc device may need to fallback to running in single queue
mode if host side only wants to support single queue.

Recent change for handling mtu broke this in setup logic.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Fixes: 3ffe64f1a641 ("hv_netvsc: split sub-channel setup into async and sync")
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/rndis_filter.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1307,6 +1307,7 @@ out:
 	/* setting up multiple channels failed */
 	net_device->max_chn = 1;
 	net_device->num_chn = 1;
+	return 0;
 
 err_dev_remv:
 	rndis_filter_device_remove(dev, net_device);