From a6bb87522f42aea056585282a70de7512d297323 Mon Sep 17 00:00:00 2001
From: Harvey Yang <harvey.huawei.yang@gmail.com>
Date: Thu, 15 Nov 2012 16:32:49 +0800
Subject: [PATCH] usb: usbip: userspace: remove the port state file when
 detaching port.

with the last detached port state file remaining, usbip reports error on
attaching. So clean up the state files on detaching.

Signed-off-by: Harvey Yang <harvey.huawei.yang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/usbip/userspace/src/usbip_detach.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/staging/usbip/userspace/src/usbip_detach.c b/drivers/staging/usbip/userspace/src/usbip_detach.c
index 89bf3c195c28..dac5f065755a 100644
--- a/drivers/staging/usbip/userspace/src/usbip_detach.c
+++ b/drivers/staging/usbip/userspace/src/usbip_detach.c
@@ -19,6 +19,7 @@
 #include <sysfs/libsysfs.h>
 
 #include <ctype.h>
+#include <limits.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -46,6 +47,7 @@ static int detach_port(char *port)
 {
 	int ret;
 	uint8_t portnum;
+	char path[PATH_MAX+1];
 
 	for (unsigned int i=0; i < strlen(port); i++)
 		if (!isdigit(port[i])) {
@@ -57,6 +59,13 @@ static int detach_port(char *port)
 
 	portnum = atoi(port);
 
+	/* remove the port state file */
+
+	snprintf(path, PATH_MAX, VHCI_STATE_PATH"/port%d", portnum);
+
+	remove(path);
+	rmdir(VHCI_STATE_PATH);
+
 	ret = usbip_vhci_driver_open();
 	if (ret < 0) {
 		err("open vhci_driver");