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

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Date:	Wed, 21 May 2008 15:36:49 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Oliver Neukum <oliver@...kum.org>
cc:	Greg KH <greg@...ah.com>, linux-usb@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>, lchiquitto@...ell.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: fix deadlock in HCD code

On Wed, 21 May 2008, Oliver Neukum wrote:

> This turns out not to be the case. Interrupts are disabled.

You're right, this callchain can't cause the deadlock indeed. I'll go 
through the other possibilities.

To give some background to others reading this thread -- Leonardo (in CC) 
reported [1] that this patch fixes hard kernel hangs he has been seeing 
when using USB CDMA modem.

Still, we don't currently seem to see the place where the interrupts get 
enabled that makes the deadlock to trigger.

[1] https://bugzilla.novell.com/show_bug.cgi?id=378509

-- 
Jiri Kosina
SUSE Labs
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