USB: disable endpoints after unbinding interfaces, not before

commit 80f0cf3947889014d3a3dc0ad60fb87cfda4b12a upstream.

This patch (as1430) fixes a bug in usbcore.  When a device
configuration change occurs or a device is removed, the endpoints for
the old config should be completely disabled.  However it turns out
they aren't; this is because usb_unbind_interface() calls
usb_enable_interface() or usb_set_interface() to put interfaces back
in altsetting 0, which re-enables the interfaces' endpoints.

As a result, when a device goes through a config change or is
unconfigured, the ep_in[] and ep_out[] arrays may be left holding old
pointers to usb_host_endpoint structures.  If the device is
deauthorized these structures get freed, and the stale pointers cause
errors when the the device is eventually unplugged.

The solution is to disable the endpoints after unbinding the
interfaces instead of before.  This isn't as large a change as it
sounds, since usb_unbind_interface() disables all the interface's
endpoints anyway before calling the driver's disconnect routine,
unless the driver claims to support "soft" unbind.

This fixes Bugzilla #19192.  Thanks to "Tom" Lei Ming for diagnosing
the underlying cause of the problem.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Carsten Sommer <carsten_sommer@ymail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 1ca6545319a69a80968c490dd25d585ee8454c92..409cc94a1331f0dfe0f42f420947b406bf65b1af 100644 (file)
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1185,13 +1185,6 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
 {
        int i;
 
-       dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__,
-               skip_ep0 ? "non-ep0" : "all");
-       for (i = skip_ep0; i < 16; ++i) {
-               usb_disable_endpoint(dev, i, true);
-               usb_disable_endpoint(dev, i + USB_DIR_IN, true);
-       }
-
        /* getting rid of interfaces will disconnect
         * any drivers bound to them (a key side effect)
         */
@@ -1221,6 +1214,13 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
                if (dev->state == USB_STATE_CONFIGURED)
                        usb_set_device_state(dev, USB_STATE_ADDRESS);
        }
+
+       dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__,
+               skip_ep0 ? "non-ep0" : "all");
+       for (i = skip_ep0; i < 16; ++i) {
+               usb_disable_endpoint(dev, i, true);
+               usb_disable_endpoint(dev, i + USB_DIR_IN, true);
+       }
 }
 
 /**