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Date: Mon, 4 Apr 2022 18:10:36 +0300
From: David Kahurani <k.kahurani@...il.com>
To: netdev@...r.kernel.org
Cc: syzbot+d3dbdf31fbe9d8f5f311@...kaller.appspotmail.com,
davem@...emloft.net, jgg@...pe.ca, kuba@...nel.org,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
phil@...lpotter.co.uk, syzkaller-bugs@...glegroups.com,
arnd@...db.de, paskripkin@...il.com,
David Kahurani <k.kahurani@...il.com>
Subject: [PATCH] net: ax88179: add proper error handling of usb read errors
Reads that are lesser than the requested size lead to uninit-value bugs. Qualify
such reads as errors and handle them correctly.
ax88179_178a 2-1:0.35 (unnamed net_device) (uninitialized): Failed to read reg index 0x0001: -71
ax88179_178a 2-1:0.35 (unnamed net_device) (uninitialized): Failed to read reg index 0x0002: -71
=====================================================
BUG: KMSAN: uninit-value in ax88179_check_eeprom drivers/net/usb/ax88179_178a.c:1074 [inline]
BUG: KMSAN: uninit-value in ax88179_led_setting+0x884/0x30b0 drivers/net/usb/ax88179_178a.c:1168
ax88179_check_eeprom drivers/net/usb/ax88179_178a.c:1074 [inline]
ax88179_led_setting+0x884/0x30b0 drivers/net/usb/ax88179_178a.c:1168
ax88179_bind+0xe75/0x1990 drivers/net/usb/ax88179_178a.c:1411
usbnet_probe+0x1284/0x4140 drivers/net/usb/usbnet.c:1747
usb_probe_interface+0xf19/0x1600 drivers/usb/core/driver.c:396
really_probe+0x67d/0x1510 drivers/base/dd.c:596
__driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751
driver_probe_device drivers/base/dd.c:781 [inline]
__device_attach_driver+0x79f/0x1120 drivers/base/dd.c:898
bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427
__device_attach+0x593/0x8e0 drivers/base/dd.c:969
device_initial_probe+0x4a/0x60 drivers/base/dd.c:1016
bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487
device_add+0x1d3e/0x2400 drivers/base/core.c:3394
usb_set_configuration+0x37e9/0x3ed0 drivers/usb/core/message.c:2170
usb_generic_driver_probe+0x13c/0x300 drivers/usb/core/generic.c:238
usb_probe_device+0x309/0x570 drivers/usb/core/driver.c:293
really_probe+0x67d/0x1510 drivers/base/dd.c:596
__driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751
driver_probe_device drivers/base/dd.c:781 [inline]
__device_attach_driver+0x79f/0x1120 drivers/base/dd.c:898
bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427
__device_attach+0x593/0x8e0 drivers/base/dd.c:969
device_initial_probe+0x4a/0x60 drivers/base/dd.c:1016
Signed-off-by: David Kahurani <k.kahurani@...il.com>
Reported-by: syzbot+d3dbdf31fbe9d8f5f311@...kaller.appspotmail.com
---
drivers/net/usb/ax88179_178a.c | 255 +++++++++++++++++++++++++++------
1 file changed, 213 insertions(+), 42 deletions(-)
diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index e2fa56b92..b5e114bed 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -185,8 +185,9 @@ static const struct {
{7, 0xcc, 0x4c, 0x18, 8},
};
-static int __ax88179_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
- u16 size, void *data, int in_pm)
+static int __must_check __ax88179_read_cmd(struct usbnet *dev, u8 cmd,
+ u16 value, u16 index, u16 size,
+ void *data, int in_pm)
{
int ret;
int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
@@ -201,9 +202,12 @@ static int __ax88179_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, index, data, size);
- if (unlikely(ret < 0))
+ if (unlikely(ret < size)) {
+ ret = ret < 0 ? ret : -ENODATA;
+
netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
index, ret);
+ }
return ret;
}
@@ -249,19 +253,26 @@ static void ax88179_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value,
}
}
-static int ax88179_read_cmd_nopm(struct usbnet *dev, u8 cmd, u16 value,
- u16 index, u16 size, void *data)
+static int __must_check ax88179_read_cmd_nopm(struct usbnet *dev, u8 cmd,
+ u16 value, u16 index, u16 size,
+ void *data)
{
int ret;
if (2 == size) {
u16 buf;
ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 1);
+
+ if (ret < 0)
+ return ret;
le16_to_cpus(&buf);
*((u16 *)data) = buf;
} else if (4 == size) {
u32 buf;
ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 1);
+
+ if (ret < 0)
+ return ret;
le32_to_cpus(&buf);
*((u32 *)data) = buf;
} else {
@@ -290,19 +301,23 @@ static int ax88179_write_cmd_nopm(struct usbnet *dev, u8 cmd, u16 value,
return ret;
}
-static int ax88179_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
- u16 size, void *data)
+static int __must_check ax88179_read_cmd(struct usbnet *dev, u8 cmd, u16 value,
+ u16 index, u16 size, void *data)
{
int ret;
if (2 == size) {
u16 buf = 0;
ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 0);
+ if (ret < 0)
+ return ret;
le16_to_cpus(&buf);
*((u16 *)data) = buf;
} else if (4 == size) {
u32 buf = 0;
ret = __ax88179_read_cmd(dev, cmd, value, index, size, &buf, 0);
+ if (ret < 0)
+ return ret;
le32_to_cpus(&buf);
*((u32 *)data) = buf;
} else {
@@ -354,8 +369,15 @@ static int ax88179_mdio_read(struct net_device *netdev, int phy_id, int loc)
{
struct usbnet *dev = netdev_priv(netdev);
u16 res;
+ int ret;
+
+ ret = ax88179_read_cmd(dev, AX_ACCESS_PHY, phy_id, (__u16)loc, 2, &res);
+
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read PHY_ID: %d\n", ret);
+ return ret;
+ }
- ax88179_read_cmd(dev, AX_ACCESS_PHY, phy_id, (__u16)loc, 2, &res);
return res;
}
@@ -427,19 +449,31 @@ static int ax88179_suspend(struct usb_interface *intf, pm_message_t message)
struct usbnet *dev = usb_get_intfdata(intf);
u16 tmp16;
u8 tmp8;
+ int ret;
usbnet_suspend(intf, message);
/* Disable RX path */
- ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
- 2, 2, &tmp16);
+ ret = ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
+ 2, 2, &tmp16);
+
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read MEDIUM_STATUS_MODE: %d\n",
+ ret);
+ return ret;
+ }
+
tmp16 &= ~AX_MEDIUM_RECEIVE_EN;
ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
2, 2, &tmp16);
/* Force bulk-in zero length */
- ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL,
- 2, 2, &tmp16);
+ ret = ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL,
+ 2, 2, &tmp16);
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read PHYPWR_RSTCTL: %d\n", ret);
+ return ret;
+ }
tmp16 |= AX_PHYPWR_RSTCTL_BZ | AX_PHYPWR_RSTCTL_IPRL;
ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL,
@@ -462,6 +496,7 @@ static int ax88179_auto_detach(struct usbnet *dev, int in_pm)
{
u16 tmp16;
u8 tmp8;
+ int ret;
int (*fnr)(struct usbnet *, u8, u16, u16, u16, void *);
int (*fnw)(struct usbnet *, u8, u16, u16, u16, const void *);
@@ -481,11 +516,19 @@ static int ax88179_auto_detach(struct usbnet *dev, int in_pm)
/* Enable Auto Detach bit */
tmp8 = 0;
- fnr(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
+ ret = fnr(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
+ if (ret < 0) {
+ netdev_dbg(dev->net, "Failed to read CLK_SELECT: %d", ret);
+ return ret;
+ }
tmp8 |= AX_CLK_SELECT_ULR;
fnw(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
- fnr(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, &tmp16);
+ ret = fnr(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, &tmp16);
+ if (ret < 0) {
+ netdev_dbg(dev->net, "Failed to read PHYPWR_RSTCTL: %d", ret);
+ return ret;
+ }
tmp16 |= AX_PHYPWR_RSTCTL_AT;
fnw(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, &tmp16);
@@ -497,6 +540,7 @@ static int ax88179_resume(struct usb_interface *intf)
struct usbnet *dev = usb_get_intfdata(intf);
u16 tmp16;
u8 tmp8;
+ int ret;
usbnet_link_change(dev, 0, 0);
@@ -515,7 +559,14 @@ static int ax88179_resume(struct usb_interface *intf)
ax88179_auto_detach(dev, 1);
/* Enable clock */
- ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
+ ret = ax88179_read_cmd_nopm(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
+
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read CLK_SELECT %d\n", ret);
+
+ return ret;
+ }
+
tmp8 |= AX_CLK_SELECT_ACS | AX_CLK_SELECT_BCS;
ax88179_write_cmd_nopm(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, &tmp8);
msleep(100);
@@ -951,23 +1002,45 @@ static int
ax88179_set_features(struct net_device *net, netdev_features_t features)
{
u8 tmp;
+ int ret;
struct usbnet *dev = netdev_priv(net);
netdev_features_t changed = net->features ^ features;
if (changed & NETIF_F_IP_CSUM) {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL,
+ 1, 1, &tmp);
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read TXCOE_CTL: %d\n",
+ ret);
+ return ret;
+ }
+
tmp ^= AX_TXCOE_TCP | AX_TXCOE_UDP;
ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
}
if (changed & NETIF_F_IPV6_CSUM) {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL,
+ 1, 1, &tmp);
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read TXCOE_CTL: %d\n",
+ ret);
+ return ret;
+ }
+
tmp ^= AX_TXCOE_TCPV6 | AX_TXCOE_UDPV6;
ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_TXCOE_CTL, 1, 1, &tmp);
}
if (changed & NETIF_F_RXCSUM) {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL, 1, 1, &tmp);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL,
+ 1, 1, &tmp);
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read TXCOE_CTL: %d\n",
+ ret);
+ return ret;
+ }
+
tmp ^= AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6;
ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_RXCOE_CTL, 1, 1, &tmp);
@@ -980,19 +1053,36 @@ static int ax88179_change_mtu(struct net_device *net, int new_mtu)
{
struct usbnet *dev = netdev_priv(net);
u16 tmp16;
+ int ret;
net->mtu = new_mtu;
dev->hard_mtu = net->mtu + net->hard_header_len;
if (net->mtu > 1500) {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
- 2, 2, &tmp16);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC,
+ AX_MEDIUM_STATUS_MODE,
+ 2, 2, &tmp16);
+ if (ret < 0){
+ netdev_dbg(dev->net,
+ "Failed to read MEDIUM_STATUS_MODE %d\n",
+ ret);
+ return ret;
+ }
+
tmp16 |= AX_MEDIUM_JUMBO_EN;
ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
2, 2, &tmp16);
} else {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
- 2, 2, &tmp16);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC,
+ AX_MEDIUM_STATUS_MODE,
+ 2, 2, &tmp16);
+ if (ret < 0){
+ netdev_dbg(dev->net,
+ "Failed to read MEDIUM_STATUS_MODE %d\n",
+ ret);
+ return ret;
+ }
+
tmp16 &= ~AX_MEDIUM_JUMBO_EN;
ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
2, 2, &tmp16);
@@ -1045,6 +1135,7 @@ static int ax88179_check_eeprom(struct usbnet *dev)
u8 i, buf, eeprom[20];
u16 csum, delay = HZ / 10;
unsigned long jtimeout;
+ int ret;
/* Read EEPROM content */
for (i = 0; i < 6; i++) {
@@ -1060,16 +1151,30 @@ static int ax88179_check_eeprom(struct usbnet *dev)
jtimeout = jiffies + delay;
do {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
- 1, 1, &buf);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
+ 1, 1, &buf);
+
+ if (ret < 0) {
+ netdev_dbg(dev->net,
+ "Failed to read SROM_CMD: %d\n",
+ ret);
+ return ret;
+ }
if (time_after(jiffies, jtimeout))
return -EINVAL;
} while (buf & EEP_BUSY);
- __ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_LOW,
- 2, 2, &eeprom[i * 2], 0);
+ ret = __ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_LOW,
+ 2, 2, &eeprom[i * 2], 0);
+
+ if (ret < 0) {
+ netdev_dbg(dev->net,
+ "Failed to read SROM_DATA_LOW: %d\n",
+ ret);
+ return ret;
+ }
if ((i == 0) && (eeprom[0] == 0xFF))
return -EINVAL;
@@ -1149,12 +1254,19 @@ static int ax88179_convert_old_led(struct usbnet *dev, u16 *ledvalue)
static int ax88179_led_setting(struct usbnet *dev)
{
+ int ret;
u8 ledfd, value = 0;
u16 tmp, ledact, ledlink, ledvalue = 0, delay = HZ / 10;
unsigned long jtimeout;
/* Check AX88179 version. UA1 or UA2*/
- ax88179_read_cmd(dev, AX_ACCESS_MAC, GENERAL_STATUS, 1, 1, &value);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, GENERAL_STATUS, 1, 1, &value);
+
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read GENERAL_STATUS: %d\n",
+ ret);
+ return ret;
+ }
if (!(value & AX_SECLD)) { /* UA1 */
value = AX_GPIO_CTRL_GPIO3EN | AX_GPIO_CTRL_GPIO2EN |
@@ -1178,20 +1290,40 @@ static int ax88179_led_setting(struct usbnet *dev)
jtimeout = jiffies + delay;
do {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
- 1, 1, &value);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_CMD,
+ 1, 1, &value);
+ if (ret < 0){
+ netdev_dbg(dev->net,
+ "Failed to read SROM_CMD: %d\n",
+ ret);
+ return ret;
+ }
if (time_after(jiffies, jtimeout))
return -EINVAL;
} while (value & EEP_BUSY);
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_HIGH,
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_HIGH,
1, 1, &value);
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read SROM_DATA_HIGH: %d\n",
+ ret);
+ return ret;
+ }
+
+
ledvalue = (value << 8);
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_LOW,
- 1, 1, &value);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_SROM_DATA_LOW,
+ 1, 1, &value);
+
+ if (ret < 0) {
+ netdev_dbg(dev->net, "Failed to read SROM_DATA_LOW: %d",
+ ret);
+ return ret;
+ }
+
ledvalue |= value;
/* load internal ROM for defaule setting */
@@ -1213,12 +1345,22 @@ static int ax88179_led_setting(struct usbnet *dev)
ax88179_write_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
GMII_PHYPAGE, 2, &tmp);
- ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
- GMII_LED_ACT, 2, &ledact);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
+ GMII_LED_ACT, 2, &ledact);
- ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read PHY_ID: %d", ret);
+ return ret;
+ }
+
+ ret = ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
GMII_LED_LINK, 2, &ledlink);
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read PHY_ID: %d", ret);
+ return ret;
+ }
+
ledact &= GMII_LED_ACTIVE_MASK;
ledlink &= GMII_LED_LINK_MASK;
@@ -1295,6 +1437,7 @@ static int ax88179_led_setting(struct usbnet *dev)
static void ax88179_get_mac_addr(struct usbnet *dev)
{
u8 mac[ETH_ALEN];
+ int ret;
memset(mac, 0, sizeof(mac));
@@ -1303,8 +1446,12 @@ static void ax88179_get_mac_addr(struct usbnet *dev)
netif_dbg(dev, ifup, dev->net,
"MAC address read from device tree");
} else {
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_NODE_ID, ETH_ALEN,
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_NODE_ID, ETH_ALEN,
ETH_ALEN, mac);
+
+ if (ret < 0)
+ netdev_dbg(dev->net, "Failed to read NODE_ID: %d", ret);
+
netif_dbg(dev, ifup, dev->net,
"MAC address read from ASIX chip");
}
@@ -1572,6 +1719,7 @@ static int ax88179_link_reset(struct usbnet *dev)
u16 mode, tmp16, delay = HZ / 10;
u32 tmp32 = 0x40000000;
unsigned long jtimeout;
+ int ret;
jtimeout = jiffies + delay;
while (tmp32 & 0x40000000) {
@@ -1581,7 +1729,13 @@ static int ax88179_link_reset(struct usbnet *dev)
&ax179_data->rxctl);
/*link up, check the usb device control TX FIFO full or empty*/
- ax88179_read_cmd(dev, 0x81, 0x8c, 0, 4, &tmp32);
+ ret = ax88179_read_cmd(dev, 0x81, 0x8c, 0, 4, &tmp32);
+
+ if (ret < 0) {
+ netdev_dbg(dev->net, "Failed to read TX FIFO: %d\n",
+ ret);
+ return ret;
+ }
if (time_after(jiffies, jtimeout))
return 0;
@@ -1590,11 +1744,21 @@ static int ax88179_link_reset(struct usbnet *dev)
mode = AX_MEDIUM_RECEIVE_EN | AX_MEDIUM_TXFLOW_CTRLEN |
AX_MEDIUM_RXFLOW_CTRLEN;
- ax88179_read_cmd(dev, AX_ACCESS_MAC, PHYSICAL_LINK_STATUS,
- 1, 1, &link_sts);
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, PHYSICAL_LINK_STATUS,
+ 1, 1, &link_sts);
- ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
- GMII_PHY_PHYSR, 2, &tmp16);
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read LINK_STATUS: %d", ret);
+ return ret;
+ }
+
+ ret = ax88179_read_cmd(dev, AX_ACCESS_PHY, AX88179_PHY_ID,
+ GMII_PHY_PHYSR, 2, &tmp16);
+
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read PHY_ID: %d\n", ret);
+ return ret;
+ }
if (!(tmp16 & GMII_PHY_PHYSR_LINK)) {
return 0;
@@ -1732,9 +1896,16 @@ static int ax88179_reset(struct usbnet *dev)
static int ax88179_stop(struct usbnet *dev)
{
u16 tmp16;
+ int ret;
- ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
+ ret = ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
2, 2, &tmp16);
+
+ if (ret < 0){
+ netdev_dbg(dev->net, "Failed to read STATUS_MODE: %d\n", ret);
+ return ret;
+ }
+
tmp16 &= ~AX_MEDIUM_RECEIVE_EN;
ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
2, 2, &tmp16);
--
2.25.1
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