From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Mon, 11 Apr 2011 08:59:09 +0000 (+0200)
Subject: serial/imx: read cts state only after acking cts change irq
X-Git-Tag: v2.6.39-rc5~19^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5680e94148a86e8c31fdc5cb0ea0d5c6810c05b0;p=pandora-kernel.git

serial/imx: read cts state only after acking cts change irq

If cts changes between reading the level at the cts input (USR1_RTSS)
and acking the irq (USR1_RTSD) the last edge doesn't generate an irq and
uart_handle_cts_change is called with a outdated value for cts.

The race was introduced by commit

	ceca629 ([ARM] 2971/1: i.MX uart handle rts irq)

Reported-by: Arwed Springer <Arwed.Springer@de.trumpf.com>
Tested-by: Arwed Springer <Arwed.Springer@de.trumpf.com>
Cc: stable@kernel.org # 2.6.14+
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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