From: Inha Song <ideal.song@samsung.com>
Date: Fri, 7 Aug 2015 01:35:59 +0000 (+0900)
Subject: mfd: wm8994: Fix NULL pointer exception on missing pdata
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=dd30acc889f586cecdea0d7f401f3dc80752b41e;p=linux-beck.git

mfd: wm8994: Fix NULL pointer exception on missing pdata

If we use the dev_get_platdata, pdata can be NULL in DT environments.
Actually, NULL pointer exception is occurs with error messages like this:

[    1.226583] Unable to handle kernel NULL pointer dereference at virtual address 00000044
[    1.467910] [<c02f1e38>] (wm8994_irq_init) from [<c02f1bd4>] (wm8994_i2c_probe+0x684/0x858)
[    1.476241] [<c02f1bd4>] (wm8994_i2c_probe) from [<c0371c78>] (i2c_device_probe+0x11c/0x17c)

In wm8994-core, we already checked whether platform data is NULL and set the
wm8994->pdata to platform data if platform data is not NULL.
So, we can use wm8994->pdata instead of platform data.

Signed-off-by: Inha Song <ideal.song@samsung.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

diff --git a/drivers/mfd/wm8994-irq.c b/drivers/mfd/wm8994-irq.c
index 6f1427d32a93..18710f3b5c53 100644
--- a/drivers/mfd/wm8994-irq.c
+++ b/drivers/mfd/wm8994-irq.c
@@ -186,7 +186,7 @@ int wm8994_irq_init(struct wm8994 *wm8994)
 {
 	int ret;
 	unsigned long irqflags;
-	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
+	struct wm8994_pdata *pdata = &wm8994->pdata;
 
 	if (!wm8994->irq) {
 		dev_warn(wm8994->dev,