linux-kernel - [PATCH 5.1 29/46] aqc111: fix endianness issue in aqc111_change

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Message-Id: <20190515090626.092268427@linuxfoundation.org>
Date:   Wed, 15 May 2019 12:56:53 +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, Oliver Neukum <oneukum@...e.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.1 29/46] aqc111: fix endianness issue in aqc111_change_mtu

From: Oliver Neukum <oneukum@...e.com>

[ Upstream commit b8b277525e9df2fd2dc3d1f4fe01c6796bb107fc ]

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@...e.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/usb/aqc111.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/usb/aqc111.c
+++ b/drivers/net/usb/aqc111.c
@@ -453,6 +453,8 @@ static int aqc111_change_mtu(struct net_
 		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);