USB: repair USBDEVFS_CONNECT ioctl

For as long as I've known about it, the USBDEVFS_CONNECT ioctl hasn't
done what it's supposed to.  The current code reprobes _all_ the
unbound USB interfaces; this patch (as1021) makes it reprobe only the
interface for which it was called.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 1f4f6d02fe25..85ec65ada123 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1373,9 +1373,10 @@ static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
 
         /* let kernel drivers try to (re)bind to the interface */
         case USBDEVFS_CONNECT:
-                usb_unlock_device(ps->dev);
-                retval = bus_rescan_devices(intf->dev.bus);
-                usb_lock_device(ps->dev);
+                if (!intf->dev.driver)
+                        retval = device_attach(&intf->dev);
+                else
+                        retval = -EBUSY;
                 break;
 
         /* talk directly to the interface's driver */