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iio: adc: mediatek: fix unset field

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commit 15207a92e019803d62687455d8aa2ff9eb3dc82c upstream.

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: 6d97024dce ("iio: adc: mediatek: mt6577-auxadc, add mt6765 support")
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201018194644.3366846-1-fparent@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabien Parent 2020-10-18 21:46:44 +02:00 • committed by Greg Kroah-Hartman
commit 760d4e3ee8
1 changed files with 4 additions and 2 deletions
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6
drivers/iio/adc/mt6577_auxadc.c
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@ -9,9 +9,9 @@
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/iopoll.h>
#include <linux/io.h>
#include <linux/iio/iio.h>
@ -279,6 +279,8 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
goto err_disable_clk;
}
adc_dev->dev_comp = device_get_match_data(&pdev->dev);
mutex_init(&adc_dev->lock);
mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,