linux-kernel - [PATCH] usbip: vhci-hcd: return correct port ENABLE status

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Message-Id: <1512531681-10554-1-git-send-email-pei.zhang@intel.com>
Date:   Wed,  6 Dec 2017 11:41:21 +0800
From:   Pei Zhang <pei.zhang@...el.com>
To:     linux-kernel@...r.kernel.org, usbip-devel@...ts.sourceforge.net
Cc:     Pei Zhang <pei.zhang@...el.com>
Subject: [PATCH] usbip: vhci-hcd: return correct port ENABLE status

USB system will clear port's ENABLE feature for some USB devices when
vdev is already assigned port address. This cause getPortStatus reports
to system that this device is not enabled, client OS will failed to use
this usb device.

The failure devices include a SAMSUNG SSD storage, and a Logitech webcam.

Signed-off-by: Pei Zhang <pei.zhang@...el.com>
---
 drivers/usb/usbip/vhci_hcd.c | 38 +++++++++++++++++++++++---------------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index e4cb9f0..7b8cf70 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -350,24 +350,32 @@ static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 			dum->re_timeout = 0;
 		}
 
-		if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
-		    0 && time_after(jiffies, dum->re_timeout)) {
-			dum->port_status[rhport] |=
-				(1 << USB_PORT_FEAT_C_RESET);
-			dum->port_status[rhport] &=
-				~(1 << USB_PORT_FEAT_RESET);
-			dum->re_timeout = 0;
-
-			if (dum->vdev[rhport].ud.status ==
-			    VDEV_ST_NOTASSIGNED) {
-				usbip_dbg_vhci_rh(
-					" enable rhport %d (status %u)\n",
-					rhport,
-					dum->vdev[rhport].ud.status);
+		if (dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) {
+		    if (time_after(jiffies, dum->re_timeout)) {
 				dum->port_status[rhport] |=
-					USB_PORT_STAT_ENABLE;
+					(1 << USB_PORT_FEAT_C_RESET);
+				dum->port_status[rhport] &=
+					~(1 << USB_PORT_FEAT_RESET);
+				dum->re_timeout = 0;
+
+				if (dum->vdev[rhport].ud.status ==
+					VDEV_ST_NOTASSIGNED) {
+					usbip_dbg_vhci_rh(
+						" enable rhport %d (status %u)\n",
+						rhport,
+						dum->vdev[rhport].ud.status);
+					dum->port_status[rhport] |=
+						USB_PORT_STAT_ENABLE;
+				}
 			}
+		} else {
+			/* Port would be disabled by clearing FEAT_ENABLE bit,
+			 * make it enabled here. No more thing should be done. */
+			if (dum->vdev[rhport].ud.status == VDEV_ST_USED)
+					dum->port_status[rhport] |=
+						USB_PORT_STAT_ENABLE;
 		}
+
 		((__le16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
 		((__le16 *) buf)[1] =
 			cpu_to_le16(dum->port_status[rhport] >> 16);
-- 
2.7.4