r8152: Add Lenovo Powered USB-C Travel Hub

commit cb82a54904a99df9e8f9e9d282046055dae5a730 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index f3def96d35d4261f921dcab7793bcd55b2ed64c6..8c9eae5f307220cb4490f6d39b68a8f0032f43a0 100644 (file)
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -800,6 +800,13 @@ 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 e30792380812a5c6850a3ebf499b12945baa3673..bd91d4bad49b25ace1f1a1772c2d0ddd77bca3ce 100644 (file)
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -5337,6 +5337,7 @@ 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)},