linux-kernel - [PATCH] mfd: wm97xx-core: platform data can be NULL

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Date:   Sun,  3 Jun 2018 22:16:17 +0200
From:   Robert Jarzmik <robert.jarzmik@...e.fr>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     patches@...nsource.cirrus.com, linux-kernel@...r.kernel.org,
        Robert Jarzmik <robert.jarzmik@...e.fr>
Subject: [PATCH] mfd: wm97xx-core: platform data can be NULL

It is not mandatory that platform data is passed along the ac97
codec. Actually there are configuration without a battery connected to
the ADC of the codec.

This is for example the case for the PXA zylonite platform, so fix the
NULL dereferencing by adding a test.

Fixes: a5c6951c49fb ("mfd: wm97xx-core: core support for wm97xx Codec")
Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
---
 drivers/mfd/wm97xx-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/wm97xx-core.c b/drivers/mfd/wm97xx-core.c
index 4141ee52a70b..f5a8347f837f 100644
--- a/drivers/mfd/wm97xx-core.c
+++ b/drivers/mfd/wm97xx-core.c
@@ -278,7 +278,7 @@ static int wm97xx_ac97_probe(struct ac97_codec_device *adev)
 
 	codec_pdata = &wm97xx->codec_pdata;
 	codec_pdata->ac97 = wm97xx->ac97;
-	codec_pdata->batt_pdata = pdata->batt_pdata;
+	codec_pdata->batt_pdata = pdata ? pdata->batt_pdata : NULL;
 
 	switch (adev->vendor_id) {
 	case WM9705_VENDOR_ID:
-- 
2.11.0