From: Anton Vorontsov <avorontsov@ru.mvista.com>
Date: Thu, 25 Dec 2008 14:15:05 +0000 (+0300)
Subject: USB: fsl_qe_udc: Fix recursive locking bug in ch9getstatus()
X-Git-Tag: v2.6.29-rc5~45^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a30551db66afa1b53a4fa7ceadddb7122bdcf491;p=pandora-kernel.git

USB: fsl_qe_udc: Fix recursive locking bug in ch9getstatus()

The call chain is this:

qe_udc_irq() <- grabs the udc->lock spinlock
rx_irq()
qe_ep0_rx()
ep0_setup_handle()
setup_received_handle()
ch9getstatus()
qe_ep_queue() <- tries to grab the udc->lock again

It seems unsafe to temporarily drop the lock in the ch9getstatus(),
so to fix that bug the lock-less __qe_ep_queue() function
implemented and used by the ch9getstatus().

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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