[PATCH] usbcore: Don't call device_release_driver recursively

[Greg KH]

[PATCH] usbcore: Don't call device_release_driver recursively

This patch fixes usb_driver_release_interface() to make it avoid calling
device_release_driver() recursively, i.e., when invoked from within the
disconnect routine for the same device.  The patch applies to your
"driver" tree.

Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
commit f409661877a25d11c2495bcd879807f17c286684
tree ce14b7c16191af662d087c9be4a3fcbe642a63af
parent c95a6b057b108c2b7add35cba1354f9af921349e
author Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Fri, 06 May 2005 15:41:08 -0400
committer Greg Kroah-Hartman <gregkh@xxxxxxx> Mon, 20 Jun 2005 15:15:29 -0700

 drivers/usb/core/usb.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -322,9 +322,15 @@ void usb_driver_release_interface(struct
 	if (!dev->driver || dev->driver != &driver->driver)
 		return;
 
-	/* don't disconnect from disconnect(), or before dev_add() */
-	if (!klist_node_attached(&dev->knode_driver) && !klist_node_attached(&dev->knode_bus))
+	/* don't release from within disconnect() */
+	if (iface->condition != USB_INTERFACE_BOUND)
+		return;
+
+	/* release only after device_add() */
+	if (klist_node_attached(&dev->knode_bus)) {
+		iface->condition = USB_INTERFACE_UNBINDING;
 		device_release_driver(dev);
+	}
 
 	dev->driver = NULL;
 	usb_set_intfdata(iface, NULL);

-
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