Keep usb host scanning from leaking file descriptors

If the first case does not succeed, then the usb scanning code will leak file
descriptors on every scan.



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5509 c046a42c-6fe2-441c-8c8c-71466251a162

usb-linux.c

@@ -1276,27 +1276,31 @@ static int usb_host_scan(void *opaque, USBScanFunc *func)
             usb_fs_type = USB_FS_PROC;
             fclose(f);
             dprintf(opened, USBPROCBUS_PATH, devices);
+            goto found_devices;
         }
         /* try additional methods if an access method hasn't been found yet */
         f = fopen(USBDEVBUS_PATH "/devices", "r");
-        if (!usb_fs_type && f) {
+        if (f) {
             /* devices found in /dev/bus/usb/ */
             strcpy(devpath, USBDEVBUS_PATH);
             usb_fs_type = USB_FS_DEV;
             fclose(f);
             dprintf(opened, USBDEVBUS_PATH, devices);
+            goto found_devices;
         }
         dir = opendir(USBSYSBUS_PATH "/devices");
-        if (!usb_fs_type && dir) {
+        if (dir) {
             /* devices found in /dev/bus/usb/ (yes - not a mistake!) */
             strcpy(devpath, USBDEVBUS_PATH);
             usb_fs_type = USB_FS_SYS;
             closedir(dir);
             dprintf(opened, USBSYSBUS_PATH, devices);
+            goto found_devices;
         }
+    found_devices:
         if (!usb_fs_type) {
             term_printf("husb: unable to access USB devices\n");
-            goto the_end;
+            return -ENOENT;
         }
 
         /* the module setting (used later for opening devices) */
@@ -1307,7 +1311,7 @@ static int usb_host_scan(void *opaque, USBScanFunc *func)
         } else {
             /* out of memory? */
             perror("husb: unable to allocate memory for device path");
-            goto the_end;
+            return -ENOMEM;
         }
     }
 
@@ -1319,8 +1323,10 @@ static int usb_host_scan(void *opaque, USBScanFunc *func)
     case USB_FS_SYS:
         ret = usb_host_scan_sys(opaque, func);
         break;
+    default:
+        ret = -EINVAL;
+        break;
     }
- the_end:
     return ret;
 }