[ARM] gpio_free might sleep, arm 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 arm architecture.
 DaVinci is skipped on purpose to simplify the merge process for patches
switching it over to use gpiolib as per request by David Brownell.

Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Cc: David Brownell <david-b@pacbell.net>
Cc: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-ns9xxx/gpio.c

@@ -8,6 +8,7 @@
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  */
+#include <linux/kernel.h>
 #include <linux/compiler.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
@@ -63,6 +64,7 @@ EXPORT_SYMBOL(gpio_request);
 
 void gpio_free(unsigned gpio)
 {
+	might_sleep();
 	clear_bit(gpio, gpiores);
 	return;
 }