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 9bb37ac99a108e4ba436d2a7f54a1dffa4b2cfaa..8325f6d65dccc1d2f712acc9fdb9e2b3d1f0f84d 100644 (file)
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -787,6 +787,13 @@ 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 cd1a07175e1116123fc6f907b04726347d341d3b..22f093797f417cfe13486a43b4c1176d8331c866 100644 (file)
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -5845,6 +5845,7 @@ 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)},