[PATCH v3] iio: adc: mediatek: fix unset field

[Jonathan Cameron]

On Sun, 18 Oct 2020 21:46:44 +0200
Fabien Parent <fparent at baylibre.com> wrote:

> 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 at baylibre.com>
> Reviewed-by: Matthias Brugger <matthias.bgg at gmail.com>
Applied to the fixes-togreg branch of iio.git and marked for stable.

Thanks,

Jonathan
> ---
> 
> Changelog:
> V2:
> 	* s/of_device_get_match_data/device_get_match_data
> 	* include mod_devicetable.h and property.h instead of of_*.h headers
> V3:
> 	* Remove extra space between Fixes tag and Signed-off-by tag
> 	* Add missing Reviewed-by tag from Matthias Brugger
> 
>  drivers/iio/adc/mt6577_auxadc.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
> index ac415cb089cd..79c1dd68b909 100644
> --- a/drivers/iio/adc/mt6577_auxadc.c
> +++ b/drivers/iio/adc/mt6577_auxadc.c
> @@ -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>
> @@ -276,6 +276,8 @@ 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,