USB: testusb: add path /dev/bus/usb to default search paths for usbfs

As real device-nodes managed by udev whose nodes lived in /dev/bus/usb
are mostly used today, let testusb tool use that directory as one default
path make tool be more convenient to use.

Signed-off-by: Du Changbin <changbinx.du@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/tools/usb/testusb.c b/tools/usb/testusb.c
index 6e0f56701e44..82d7c590c026 100644
--- a/tools/usb/testusb.c
+++ b/tools/usb/testusb.c
@@ -358,6 +358,7 @@ static const char *usbfs_dir_find(void)
 {
         static char usbfs_path_0[] = "/dev/usb/devices";
         static char usbfs_path_1[] = "/proc/bus/usb/devices";
+        static char udev_usb_path[] = "/dev/bus/usb";
 
         static char *const usbfs_paths[] = {
                 usbfs_path_0, usbfs_path_1
@@ -376,6 +377,10 @@ static const char *usbfs_dir_find(void)
                 }
         } while (++it != end);
 
+        /* real device-nodes managed by udev */
+        if (access(udev_usb_path, F_OK) == 0)
+                return udev_usb_path;
+
         return NULL;
 }