linux-kernel - [PATCH v2] vhci_hcd: USB port can get stuck in the disabled state

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Date:   Thu, 22 Jul 2021 09:55:26 +1000
From:   Michael Broadfoot <msbroadf@...il.com>
To:     valentina.manea.m@...il.com, shuah@...nel.org,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Michael Broadfoot <msbroadf@...il.com>
Subject: [PATCH v2] vhci_hcd:  USB port can get stuck in the disabled state

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. For example to initialize firmware (eg. btusb does this).
This port reset command can be sent at any time, however the VHCI hcd
root hub is only expecting reset to occur before the device receives
SET_ADDRESS. The USB port should always be enabled after a reset
(because the port is virtual and there is no possibility of hardware errors)



Signed-off-by: Michael Broadfoot <msbroadf@...il.com>
---
 drivers/usb/usbip/vhci_hcd.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index 4ba6bcdaa8e9..d3cda1b2c15a 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -455,15 +455,10 @@ 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;
 
-			if (vhci_hcd->vdev[rhport].ud.status ==
-			    VDEV_ST_NOTASSIGNED) {
-				usbip_dbg_vhci_rh(
-					" enable rhport %d (status %u)\n",
-					rhport,
-					vhci_hcd->vdev[rhport].ud.status);
-				vhci_hcd->port_status[rhport] |=
-					USB_PORT_STAT_ENABLE;
-			}
+			usbip_dbg_vhci_rh(" enable rhport %d (status %u)\n",
+					  rhport,
+					  vhci_hcd->vdev[rhport].ud.status);
+			vhci_hcd->port_status[rhport] |= USB_PORT_STAT_ENABLE;
 
 			if (hcd->speed < HCD_USB3) {
 				switch (vhci_hcd->vdev[rhport].speed) {
-- 
2.30.2