USB: Make device reset stop retrying after disconnect

This patch (as898) changes the port reset code in the hub driver.  If
a connect change occurs, it is reported the same way as a disconnect
(which of course is what it really is).

It also changes usb_reset_device(), to prevent the routine from futilely
retrying the reset after a disconnect has occurred.

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

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index d37ad08..f4ef7c2 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1539,9 +1539,9 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1,
                if (!(portstatus & USB_PORT_STAT_CONNECTION))
                        return -ENOTCONN;
 
-               /* bomb out completely if something weird happened */
+               /* bomb out completely if the connection bounced */
                if ((portchange & USB_PORT_STAT_C_CONNECTION))
-                       return -EINVAL;
+                       return -ENOTCONN;
 
                /* if we`ve finished resetting, then break out of the loop */
                if (!(portstatus & USB_PORT_STAT_RESET) &&
@@ -2974,7 +2974,7 @@ int usb_reset_device(struct usb_device *udev)
                 * Other endpoints will be handled by re-enumeration. */
                ep0_reinit(udev);
                ret = hub_port_init(parent_hub, udev, port1, i);
-               if (ret >= 0)
+               if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
                        break;
        }
        clear_bit(port1, parent_hub->busy_bits);