linux-kernel - [PATCH] iio: adc: mediatek: fix unset field

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Message-Id: <20201012194618.2170970-1-fparent@baylibre.com>
Date:   Mon, 12 Oct 2020 21:46:18 +0200
From:   Fabien Parent <fparent@...libre.com>
To:     linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-iio@...r.kernel.org
Cc:     chun-hung.wu@...iatek.com, alexandru.ardelean@...log.com,
        matthias.bgg@...il.com, pmeerw@...erw.net, lars@...afoo.de,
        knaack.h@....de, jic23@...nel.org,
        Fabien Parent <fparent@...libre.com>
Subject: [PATCH] iio: adc: mediatek: fix unset field

dev_comp field is used in a couple of places but it is never set. This
results in kernel oops when dereferencing a NULL pointer. Set the
`dev_comp` field correctly in the probe function.

Fixes: 6d97024dce23 ("iio: adc: mediatek: mt6577-auxadc, add mt6765 support")

Signed-off-by: Fabien Parent <fparent@...libre.com>
---
 drivers/iio/adc/mt6577_auxadc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index ac415cb089cd..7bd48377cd79 100644
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -276,6 +276,8 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
 		goto err_disable_clk;
 	}
 
+	adc_dev->dev_comp = of_device_get_match_data(&pdev->dev);
+
 	mutex_init(&adc_dev->lock);
 
 	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
-- 
2.28.0