Re: [rfc]btusb with SCO support

[Oliver Neukum <oliver@neukum.org>]

Am Dienstag 19 August 2008 06:05:54 schrieb Marcel Holtmann:
> However when using the unlink version, this gives me spinlock lockup
> (with and without your IRQ disable patch). From the backtrace it seems
> that usb_unanchor_urb is calling spinlock_irq_save here.

This patch should fix it.

	Regards
		Oliver

----

--- linux-2.6.27-rc3/drivers/usb/core/urb.c.alt2	2008-08-18 16:24:41.000000000 +0200
+++ linux-2.6.27-rc3/drivers/usb/core/urb.c	2008-08-19 08:12:27.000000000 +0200
@@ -607,8 +607,12 @@ void usb_unlink_anchored_urbs(struct usb
 	while (!list_empty(&anchor->urb_list)) {
 		victim = list_entry(anchor->urb_list.prev, struct urb,
 				    anchor_list);
+		usb_get_urb(victim);
+		spin_unlock_irqrestore(&anchor->lock, flags);
 		/* this will unanchor the URB */
 		usb_unlink_urb(victim);
+		usb_put_urb(victim);
+		spin_lock_irqsave(&anchor->lock, flags);
 	}
 	spin_unlock_irqrestore(&anchor->lock, flags);
 }