linux-kernel - Re: [PATCH] USB: fix deadlock in HCD code

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Date:	Wed, 21 May 2008 22:03:13 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jiri Kosina <jkosina@...e.cz>, Greg KH <greg@...ah.com>,
	linux-usb@...r.kernel.org, lchiquitto@...ell.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: fix deadlock in HCD code

Am Mittwoch 21 Mai 2008 16:46:45 schrieb Alan Stern:
> One possibility is that in an earlier call to finish_urb,
> usb_hcd_giveback_urb was called with interrupts disabled and returned 
> with interrupts enabled.  In other words, some driver's callback 
> routine may have enabled interrupts incorrectly.

Are we sure the interrupt line is not shared with another driver that calls
spin_unlock_irq() in its interrupt handler?

	Regards
		Oliver

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