From: Eugeny S. Mints <emints@ru.mvista.com>
Date: Sat, 2 Sep 2006 10:59:19 +0000 (-0700)
Subject: USB: usb serial gadget smp related bug
X-Git-Tag: v2.6.19-rc1~899^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=80f8af0c59385b41564a3ae670f94a1b4caa43b2;p=pandora-kernel.git

USB: usb serial gadget smp related bug

Adjust dev->dev_lock spinlock lock/unlock calls to be safe for SMP case.
Otherwise the following sequence may lead to a deadlock in SMP case:

gs_send()->usb_ep_queue()
	->(in case a request is satisfied immediatly) gs_write_complete()

for ex for pxa2xx_udc.c:
usb_ep_queue()->pxa2xx_ep_queue()->write_fifo()->done()->gs_write_complete()
(through req.complete pointer)

Signed-off-by: Eugeny S. Mints <emints@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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