netdev - [PATCH net 3/3] aqc111: cleanup mtu related logic

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Message-ID: <c24be8a514fbb2cc903c9a8ba69f9d461ec042f0.1558017386.git.igor.russkikh@aquantia.com>
Date:   Thu, 16 May 2019 14:52:25 +0000
From:   Igor Russkikh <Igor.Russkikh@...antia.com>
To:     "David S . Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Oliver Neukum <oneukum@...e.com>,
        Dmitry Bezrukov <Dmitry.Bezrukov@...antia.com>,
        Igor Russkikh <Igor.Russkikh@...antia.com>
Subject: [PATCH net 3/3] aqc111: cleanup mtu related logic

Original fix b8b277525e9d was done under impression that invalid data
could be written for mtu configuration higher that 16334.

But the high limit will anyway be rejected my max_mtu check in caller.
Thus, make the code cleaner and allow it doing the configuration without
checking for maximum mtu value.

Fixes: b8b277525e9d ("aqc111: fix endianness issue in aqc111_change_mtu")
Signed-off-by: Igor Russkikh <igor.russkikh@...antia.com>
---
 drivers/net/usb/aqc111.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/aqc111.c b/drivers/net/usb/aqc111.c
index 408df2d335e3..7e44110746dd 100644
--- a/drivers/net/usb/aqc111.c
+++ b/drivers/net/usb/aqc111.c
@@ -437,7 +437,7 @@ static int aqc111_change_mtu(struct net_device *net, int new_mtu)
 	aqc111_write16_cmd(dev, AQ_ACCESS_MAC, SFR_MEDIUM_STATUS_MODE,
 			   2, &reg16);
 
-	if (dev->net->mtu > 12500 && dev->net->mtu <= 16334) {
+	if (dev->net->mtu > 12500) {
 		memcpy(buf, &AQC111_BULKIN_SIZE[2], 5);
 		/* RX bulk configuration */
 		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_RX_BULKIN_QCTRL,
@@ -451,10 +451,8 @@ static int aqc111_change_mtu(struct net_device *net, int new_mtu)
 		reg16 = 0x1020;
 	else if (dev->net->mtu <= 12500)
 		reg16 = 0x1420;
-	else if (dev->net->mtu <= 16334)
-		reg16 = 0x1A20;
 	else
-		return 0;
+		reg16 = 0x1A20;
 
 	aqc111_write16_cmd(dev, AQ_ACCESS_MAC, SFR_PAUSE_WATERLVL_LOW,
 			   2, &reg16);
-- 
2.17.1