From: Oliver Neukum <oneukum@suse.com>
Date: Thu, 9 May 2019 09:08:16 +0000 (+0200)
Subject: aqc111: fix endianness issue in aqc111_change_mtu
X-Git-Tag: v5.15~6400^2~9
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=b8b277525e9df2fd2dc3d1f4fe01c6796bb107fc;p=mirror_ubuntu-kernels.git

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>
---

diff --git a/drivers/net/usb/aqc111.c b/drivers/net/usb/aqc111.c
index aff995be2a31..408df2d335e3 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);