From: Fabio Estevam <festevam@xxxxxxx>
According to Documentation/driver-api/usb/URB.rst when a device
is unplugged usb_submit_urb() returns -ENODEV.
This error code propagates all the way up to usbnet_read_cmd() and
usbnet_write_cmd() calls inside the smsc95xx.c driver during
Ethernet cable unplug, unbind or reboot.
This causes the following errors to be shown on reboot, for example:
ci_hdrc ci_hdrc.1: remove, state 1
usb usb2: USB disconnect, device number 1
usb 2-1: USB disconnect, device number 2
usb 2-1.1: USB disconnect, device number 3
smsc95xx 2-1.1:1.0 eth1: unregister 'smsc95xx' usb-ci_hdrc.1-1.1, smsc95xx USB 2.0 Ethernet
smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
smsc95xx 2-1.1:1.0 eth1: hardware isn't capable of remote wakeup
usb 2-1.4: USB disconnect, device number 4
ci_hdrc ci_hdrc.1: USB bus 2 deregistered
ci_hdrc ci_hdrc.0: remove, state 4
usb usb1: USB disconnect, device number 1
ci_hdrc ci_hdrc.0: USB bus 1 deregistered
imx2-wdt 30280000.watchdog: Device shutdown: Expect reboot!
reboot: Restarting system
Ignore the -ENODEV errors inside __smsc95xx_mdio_read() and
__smsc95xx_phy_wait_not_busy() and do not print error messages
when -ENODEV is returned.
Signed-off-by: Fabio Estevam <festevam@xxxxxxx>
---
Hi,
Tested on 5.10.102 and 5.17-rc6.
On 5.10.102 this avoids the following kernel warning on reboot:
[ 23.077179] ci_hdrc ci_hdrc.1: remove, state 1
[ 23.081674] usb usb2: USB disconnect, device number 1
[ 23.086740] usb 2-1: USB disconnect, device number 2
[ 23.088393] smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
[ 23.091718] usb 2-1.1: USB disconnect, device number 3
[ 23.094090] smsc95xx 2-1.1:1.0 eth1: unregister 'smsc95xx'
usb-ci_hdrc.1-1.1, smsc95xx USB 2.0 Ethernet
[ 23.098869] smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
[ 23.098877] smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
[ 23.125763] ------------[ cut here ]------------
[ 23.125860] smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
[ 23.130393] WARNING: CPU: 3 PID: 119 at drivers/net/phy/phy.c:958
phy_error+0x14/0x60
[ 23.130397] Modules linked in:
[ 23.137550] smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
[ 23.145367] iwlmvm mac80211 libarc4
[ 23.148439] smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
[ 23.154175] af_alg caam_jr caamhash_desc caamalg_desc
crypto_engine rng_core authenc libdes btusb hci_uart btrtl btintel
btqca crct10dif_ce btbcm fsl_imx8_ddr_perf bluetooth ecdh_generic ecc
spi_imx spi_bitbang clk_bd718x7 at24 caam error rtc_snvs snvs_pwrkey
imx8mm_thermal imx_cpufreq_dt pwm_bl overlay iwlwifi cfg80211 rfkill
ipv6
[ 23.193841] CPU: 3 PID: 119 Comm: kworker/u8:2 Not tainted 5.10.102-stable-standard #1
[ 23.201764] Hardware name: CompuLab i.MX8MM IoT Gateway (DT)
[ 23.207433] Workqueue: events_power_efficient phy_state_machine
[ 23.213362] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
[ 23.219375] pc : phy_error+0x14/0x60
[ 23.222954] lr : phy_state_machine+0x88/0x218
[ 23.227315] sp : ffff800011743d20
[ 23.230631] x29: ffff800011743d20 x28: ffff800011207000
[ 23.235952] x27: ffff000000008070 x26: ffff000000008020
[ 23.241273] x25: 0000000000000000 x24: 00000000ffffffed
[ 23.246595] x23: ffff0000002e44e8 x22: ffff000000161c80
[ 23.251915] x21: ffff0000002e4000 x20: 0000000000000005
[ 23.257238] x19: ffff0000002e4000 x18: 0000000000000010
[ 23.262558] x17: 0000000000000000 x16: 0000000000000000
[ 23.267878] x15: 0000000e9816052e x14: 0000000000000000
[ 23.273198] x13: 000000000000002f x12: 0000000000000198
[ 23.278518] x11: 000000000000c6f5 x10: 000000000000c6f5
[ 23.283838] x9 : 0000000000000000 x8 : ffff00007fbbc0c0
[ 23.289161] x7 : ffff00007fbbb600 x6 : 0000000000000000
[ 23.294481] x5 : 0000000000000008 x4 : 0000000000000000
[ 23.299801] x3 : ffff0000002e44e8 x2 : 0000000000000000
[ 23.305121] x1 : ffff000000161c80 x0 : ffff0000002e4000
[ 23.310442] Call trace:
[ 23.312894] phy_error+0x14/0x60
[ 23.316125] phy_state_machine+0x88/0x218
[ 23.320144] process_one_work+0x1bc/0x338
[ 23.324158] worker_thread+0x50/0x420
[ 23.327826] kthread+0x140/0x160
[ 23.331061] ret_from_fork+0x10/0x34
[ 23.334639] ---[ end trace 2cf86ece81b89776 ]---
[ 23.339391] smsc95xx 2-1.1:1.0 eth1: Failed to read reg index 0x00000114: -19
[ 23.346550] smsc95xx 2-1.1:1.0 eth1: Error reading MII_ACCESS
[ 23.352312] smsc95xx 2-1.1:1.0 eth1: __smsc95xx_mdio_read: MII is busy
[ 23.358863] smsc95xx 2-1.1:1.0 eth1: hardware isn't capable of remote wakeup
[ 23.384599] usb 2-1.4: USB disconnect, device number 4
[ 23.394062] ci_hdrc ci_hdrc.1: USB bus 2 deregistered
[ 23.401921] ci_hdrc ci_hdrc.0: remove, state 4
[ 23.406444] usb usb1: USB disconnect, device number 1
[ 23.412082] ci_hdrc ci_hdrc.0: USB bus 1 deregistered
[ 23.438063] imx2-wdt 30280000.watchdog: Device shutdown: Expect reboot!
[ 23.444895] reboot: Restarting system
drivers/net/usb/smsc95xx.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index b17bff6a1015..61a5748da133 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -84,7 +84,7 @@ static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
| USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, &buf, 4);
- if (unlikely(ret < 0)) {
+ if (ret < 0 && ret != -ENODEV) {
netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
index, ret);
return ret;
@@ -116,7 +116,7 @@ static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
| USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, &buf, 4);
- if (unlikely(ret < 0))
+ if (ret < 0 && ret != -ENODEV)
netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
index, ret);
@@ -159,6 +159,9 @@ static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
do {
ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
if (ret < 0) {
+ /* Ignore -ENODEV error during disconnect() */
+ if (ret == -ENODEV)
+ return 0;
netdev_warn(dev->net, "Error reading MII_ACCESS\n");
return ret;
}
@@ -194,7 +197,8 @@ static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
if (ret < 0) {
- netdev_warn(dev->net, "Error writing MII_ADDR\n");
+ if (ret != -ENODEV)
+ netdev_warn(dev->net, "Error writing MII_ADDR\n");
goto done;
}
@@ -206,7 +210,8 @@ static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
if (ret < 0) {
- netdev_warn(dev->net, "Error reading MII_DATA\n");
+ if (ret != -ENODEV)
+ netdev_warn(dev->net, "Error reading MII_DATA\n");
goto done;
}
@@ -214,6 +219,10 @@ static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
done:
mutex_unlock(&dev->phy_mutex);
+
+ /* Ignore -ENODEV error during disconnect() */
+ if (ret == -ENODEV)
+ return 0;
return ret;
}
@@ -235,7 +244,8 @@ static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
val = regval;
ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
if (ret < 0) {
- netdev_warn(dev->net, "Error writing MII_DATA\n");
+ if (ret != -ENODEV)
+ netdev_warn(dev->net, "Error writing MII_DATA\n");
goto done;
}
@@ -243,7 +253,8 @@ static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
if (ret < 0) {
- netdev_warn(dev->net, "Error writing MII_ADDR\n");
+ if (ret != -ENODEV)
+ netdev_warn(dev->net, "Error writing MII_ADDR\n");
goto done;
}
--
2.25.1
