From: Leon Schuermann <leon@is.currently.online> [ Upstream commit cb82a54904a99df9e8f9e9d282046055dae5a730 ] 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@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/usb/cdc_ether.c | 7 +++++++ drivers/net/usb/r8152.c | 1 + 2 files changed, 8 insertions(+) diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c index 1de97b69ce4e2..529c8fac15314 100644 --- 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 1b1ec41978300..7dc6055855354 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -5352,6 +5352,7 @@ 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)}, -- 2.27.0
