linux-kernel - [PATCH -next] gpio: xilinx: Do not use gpiochip_get_data() in xgpio_save

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Message-Id: <1452126010-1111-1-git-send-email-linux@roeck-us.net>
Date:	Wed,  6 Jan 2016 16:20:10 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Michal Simek <michal.simek@...inx.com>,
	linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH -next] gpio: xilinx: Do not use gpiochip_get_data() in xgpio_save_regs()

Commit 097d88e94c44 ("gpio: xilinx: use gpiochip data pointer") replaces
the use of container_of() with gpiochip_get_data(). Unfortunately, the
data pointer is not yet set by the time xgpio_save_regs() is called,
causing a system hang.

Fixes: 097d88e94c44 ("gpio: xilinx: use gpiochip data pointer")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
It might make sense to merge this patch with the patch introducing the problem.

 drivers/gpio/gpio-xilinx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 3345ab0ba1b3..d0fbb7f99523 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -207,7 +207,8 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
  */
 static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
 {
-	struct xgpio_instance *chip = gpiochip_get_data(&mm_gc->gc);
+	struct xgpio_instance *chip =
+		container_of(mm_gc, struct xgpio_instance, mmchip);
 
 	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET,	chip->gpio_state[0]);
 	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET, chip->gpio_dir[0]);
-- 
2.1.4

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