linux-kernel - [PATCH] gpio_free might sleep, blackfin architecture

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Date:	Mon, 15 Sep 2008 22:02:42 +0200
From:	Uwe Kleine-König 
	<ukleinek@...ormatik.uni-freiburg.de>
To:	linux-kernel@...r.kernel.org
Cc:	David Brownell <david-b@...bell.net>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Guennadi Liakhovetski <g.liakhovetski@...gutronix.de>,
	Greg KH <greg@...ah.com>, Kay Sievers <kay.sievers@...y.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH] gpio_free might sleep, blackfin architecture

According to the documentation gpio_free should only be called from task
context only.  To make this more explicit add a might sleep to all
implementations.

This patch changes the gpio_free implementations for the blackfin
architecture.

Signed-off-by: Uwe Kleine-König <ukleinek@...ormatik.uni-freiburg.de>
Cc: David Brownell <david-b@...bell.net>
Cc: Bryan Wu <cooloney@...nel.org
Cc: uclinux-dist-devel@...ckfin.uclinux.org
Cc: Guennadi Liakhovetski <g.liakhovetski@...gutronix.de>
Cc: Greg KH <greg@...ah.com>
Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Russell King <rmk+kernel@....linux.org.uk>
---
 arch/blackfin/kernel/bfin_gpio.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index ecbd141..394006d 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -1151,6 +1151,8 @@ void gpio_free(unsigned gpio)
 	if (check_gpio(gpio) < 0)
 		return;
 
+	might_sleep();
+
 	local_irq_save(flags);
 
 	if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
-- 
1.5.6.5

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