staging: usbip: userspace: utils.c: rewrite modify_match_busid

Rewrite the function to use libsysfs.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/usbip/userspace/src/utils.c b/drivers/staging/usbip/userspace/src/utils.c
index 9b31c781dc9ef15bdd0990fd580a3833e25112b8..2d4966e6289c6bd37a8f08eb9d8b8dd0a1f19d90 100644 (file)
--- a/drivers/staging/usbip/userspace/src/utils.c
+++ b/drivers/staging/usbip/userspace/src/utils.c
@@ -1,64 +1,76 @@
 /*
+ * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
+ *               2005-2007 Takahiro Hirofuchi
  *
- * Copyright (C) 2005-2007 Takahiro Hirofuchi
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <sysfs/libsysfs.h>
 
-#include <limits.h>
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
 
-#include <fcntl.h>
-#include <libgen.h>
-#include <unistd.h>
-
 #include "usbip_common.h"
 #include "utils.h"
 
 int modify_match_busid(char *busid, int add)
 {
-       int fd;
-       int ret;
+       char bus_type[] = "usb";
+       char attr_name[] = "match_busid";
        char buff[SYSFS_BUS_ID_SIZE + 4];
        char sysfs_mntpath[SYSFS_PATH_MAX];
-       char match_busid_path[SYSFS_PATH_MAX];
+       char match_busid_attr_path[SYSFS_PATH_MAX];
+       struct sysfs_attribute *match_busid_attr;
+       int rc, ret = 0;
 
-       ret = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX);
-       if (ret < 0) {
-               err("sysfs must be mounted");
+       if (strnlen(busid, SYSFS_BUS_ID_SIZE) > SYSFS_BUS_ID_SIZE - 1) {
+               dbg("busid is too long");
                return -1;
        }
 
-       snprintf(match_busid_path, sizeof(match_busid_path),
-                "%s/%s/usb/%s/%s/match_busid", sysfs_mntpath, SYSFS_BUS_NAME,
-                SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME);
-
-       /* BUS_IS_SIZE includes NULL termination? */
-       if (strnlen(busid, SYSFS_BUS_ID_SIZE) > SYSFS_BUS_ID_SIZE - 1) {
-               dbg("busid is too long");
+       rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX);
+       if (rc < 0) {
+               err("sysfs must be mounted: %s", strerror(errno));
                return -1;
        }
 
-       fd = open(match_busid_path, O_WRONLY);
-       if (fd < 0)
+       snprintf(match_busid_attr_path, sizeof(match_busid_attr_path),
+                "%s/%s/%s/%s/%s/%s", sysfs_mntpath, SYSFS_BUS_NAME, bus_type,
+                SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name);
+
+       match_busid_attr = sysfs_open_attribute(match_busid_attr_path);
+       if (!match_busid_attr) {
+               dbg("problem getting match_busid attribute: %s",
+                   strerror(errno));
                return -1;
+       }
 
        if (add)
                snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "add %s", busid);
        else
                snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "del %s", busid);
 
-       dbg("write \"%s\" to %s", buff, match_busid_path);
+       dbg("write \"%s\" to %s", buff, match_busid_attr->path);
 
-       ret = write(fd, buff, sizeof(buff));
-       if (ret < 0) {
-               close(fd);
-               return -1;
+       rc = sysfs_write_attribute(match_busid_attr, buff, sizeof(buff));
+       if (rc < 0) {
+               dbg("failed to write match_busid: %s", strerror(errno));
+               ret = -1;
        }
 
-       close(fd);
+       sysfs_close_attribute(match_busid_attr);
 
-       return 0;
+       return ret;
 }