This one didn't quite make 2.4.3, this time I've CC'd to AC.

I've been using this fix for a few days now & it's cleared up a lot of 
problems - although I'm not 100% sure why it worked (the memset should 
do the same job as the spin_lock_init surely?).

Tony

-------- Original Message --------
Subject: [PATCH] Fix SMP lockup in usbdevfs
Date: Fri, 30 Mar 2001 02:36:47 +0100
From: Tony Hoyle <tmh@magenta-netlogic.com>
Organization: Magenta Logic
To: linux-kernel@vger.kernel.org
CC: linux-usb-devel@lists.sourceforge.net

This fixes a lockup when calling the USBDEVFS_SUBMITURB ioctl in an SMP
kernel.

Tony

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