r8152: Add Lenovo Powered USB-C Travel Hub

This USB-C Hub (17ef:721e) based on the Realtek RTL8153B chip used to
use the cdc_ether driver. However, using this driver, with the system
suspended the device constantly sends pause-frames as soon as the
receive buffer fills up. This causes issues with other devices, where
some Ethernet switches stop forwarding packets altogether.

Using the Realtek driver (r8152) fixes this issue. Pause frames are no
longer sent while the host system is suspended.

Signed-off-by: Leon Schuermann <leon@is.currently.online>
Tested-by: Leon Schuermann <leon@is.currently.online>
Link: https://lore.kernel.org/r/20210111190312.12589-2-leon@is.currently.online
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 8c1d61c2cbacbca84da2051a77d4f3e0bc943cd3..6aaa0675c28a397c30991375f22256e9209bb2a3 100644 (file)
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -793,6 +793,13 @@ static const struct usb_device_id  products[] = {
        .driver_info = 0,
 },
 
+/* Lenovo Powered USB-C Travel Hub (4X90S92381, based on Realtek RTL8153) */
+{
+       USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0x721e, USB_CLASS_COMM,
+                       USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+       .driver_info = 0,
+},
+
 /* ThinkPad USB-C Dock Gen 2 (based on Realtek RTL8153) */
 {
        USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0xa387, USB_CLASS_COMM,

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index c448d608982168826bf25a923b6ffd283c7f5206..67cd6986634fb4552b902559bc628ece68df4cfc 100644 (file)
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -6877,6 +6877,7 @@ static const struct usb_device_id rtl8152_table[] = {
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7205)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x720c)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7214)},
+       {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x721e)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0xa387)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LINKSYS, 0x0041)},
        {REALTEK_USB_DEVICE(VENDOR_ID_NVIDIA,  0x09ff)},