linux-kernel - [PATCH] leds-gpio: fix possible crash on OF device unbinding

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Date:	Mon, 16 Nov 2009 01:48:32 +0300
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	Richard Purdie <rpurdie@...ux.intel.com>
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] leds-gpio: fix possible crash on OF device unbinding

If there are leds present in the OF tree, but the GPIOs for (some) of
them are unavailable, led_data doesn't get populated with correct
devices. Then, on device unbinding, one can crash the kernel.

Workaround this by setting led->gpio to invalid value early.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
---
 drivers/leds/leds-gpio.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 7467980..e5225d2 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -78,6 +78,8 @@ static int __devinit create_gpio_led(const struct gpio_led *template,
 {
 	int ret, state;
 
+	led_dat->gpio = -1;
+
 	/* skip leds that aren't available */
 	if (!gpio_is_valid(template->gpio)) {
 		printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n",
-- 
1.6.5

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