From b8b277525e9df2fd2dc3d1f4fe01c6796bb107fc Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@suse.com>
Date: Thu, 9 May 2019 11:08:16 +0200
Subject: [PATCH] aqc111: fix endianness issue in aqc111_change_mtu

If the MTU is large enough, the first write to the device
is just repeated. On BE architectures, however, the first
word of the command will be swapped a second time and garbage
will be written. Avoid that.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/usb/aqc111.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/usb/aqc111.c b/drivers/net/usb/aqc111.c
index aff995be2a318..408df2d335e3a 100644
--- a/drivers/net/usb/aqc111.c
+++ b/drivers/net/usb/aqc111.c
@@ -453,6 +453,8 @@ static int aqc111_change_mtu(struct net_device *net, int new_mtu)
 		reg16 = 0x1420;
 	else if (dev->net->mtu <= 16334)
 		reg16 = 0x1A20;
+	else
+		return 0;
 
 	aqc111_write16_cmd(dev, AQ_ACCESS_MAC, SFR_PAUSE_WATERLVL_LOW,
 			   2, &reg16);
-- 
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