From: Shuah Khan skhan@linuxfoundation.org
stable inclusion from linux-4.19.207 commit b4bc9fa125d54ee68faac3dfbdfd6b8f845a9f97
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[ Upstream commit 66cce9e73ec61967ed1f97f30cee79bd9a2bb7ee ]
When a remote usb device is attached to the local Virtual USB Host Controller Root Hub port, the bound device driver may send a port reset command.
vhci_hcd accepts port resets only when the device doesn't have port address assigned to it. When reset happens device is in assigned/used state and vhci_hcd rejects it leaving the port in a stuck state.
This problem was found when a blue-tooth or xbox wireless dongle was passed through using usbip.
A few drivers reset the port during probe including mt76 driver specific to this bug report. Fix the problem with a change to honor reset requests when device is in used state (VDEV_ST_USED).
Reported-and-tested-by: Michael msbroadf@gmail.com Suggested-by: Michael msbroadf@gmail.com Signed-off-by: Shuah Khan skhan@linuxfoundation.org Link: https://lore.kernel.org/r/20210819225937.41037-1-skhan@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/usb/usbip/vhci_hcd.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c index a4ead4099869c..202dc76f7beb9 100644 --- a/drivers/usb/usbip/vhci_hcd.c +++ b/drivers/usb/usbip/vhci_hcd.c @@ -455,8 +455,14 @@ static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, vhci_hcd->port_status[rhport] &= ~(1 << USB_PORT_FEAT_RESET); vhci_hcd->re_timeout = 0;
+ /* + * A few drivers do usb reset during probe when + * the device could be in VDEV_ST_USED state + */ if (vhci_hcd->vdev[rhport].ud.status == - VDEV_ST_NOTASSIGNED) { + VDEV_ST_NOTASSIGNED || + vhci_hcd->vdev[rhport].ud.status == + VDEV_ST_USED) { usbip_dbg_vhci_rh( " enable rhport %d (status %u)\n", rhport,