linux-kernel - [PATCH] gpio: pca953x: fix irq_domain_add

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Message-Id: <1365010814-3263-1-git-send-email-alexandre.belloni@free-electrons.com>
Date:	Wed,  3 Apr 2013 19:40:14 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>, jimwall@...om,
	brian@...stalfontz.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-kernel@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] gpio: pca953x: fix irq_domain_add_simple usage

We actually have to pass chip as the host_data parameter of
irq_domain_add_simple() as later on, it is used to initialize chip_data
in pca953x_gpio_irq_map(). Failing to do so is leading to a NULL pointer
dereference after calling irq_data_get_irq_chip_data() in
pca953x_irq_mask(), pca953x_irq_unmask(), pca953x_irq_bus_lock(),
pca953x_irq_bus_sync_unlock() and pca953x_irq_set_type().

Fixes regression introduced by commit
0e8f2fdacf1d44651aa7e57063c76142d1f4988b (gpio: pca953x: use simple
irqdomain)

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---

This would probably be good to introduce that patch in the next 3.9 rc as the
regression leads to a lot of breakage (and cursing).

 drivers/gpio/gpio-pca953x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index e2dcac5..ea26e59 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -575,7 +575,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
 						chip->gpio_chip.ngpio,
 						irq_base,
 						&pca953x_irq_simple_ops,
-						NULL);
+						chip);
 		if (!chip->domain)
 			return -ENODEV;
 
-- 
1.7.10.4

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