Subject: [PATCH RFT 1/5] iio: mxs-lradc: fix memory leak

From: [email-masked] (Stefan Wahren)
Date: Mon, 18 Apr 2016 08:19:16 +0200

Hi Marek,

Am 14.04.2016 um 22:01 schrieb Marek Vasut:
> On 04/14/2016 05:48 PM, Stefan Wahren wrote:
>> After successful touchscreen registration the input device was
>> never freed. So fix this issue by using devm_input_allocate_device().
>>
>> Signed-off-by: Stefan Wahren <[email-masked]>
>> ---
>>  drivers/iio/adc/mxs-lradc.c |    8 ++------
>>  1 file changed, 2 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/iio/adc/mxs-lradc.c b/drivers/iio/adc/mxs-lradc.c
>> index 33051b8..0576953 100644
>> --- a/drivers/iio/adc/mxs-lradc.c
>> +++ b/drivers/iio/adc/mxs-lradc.c
>> @@ -1109,12 +1109,11 @@ static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
>>  {
>>  	struct input_dev *input;
>>  	struct device *dev = lradc->dev;
>> -	int ret;
>>  
>>  	if (!lradc->use_touchscreen)
>>  		return 0;
>>  
>> -	input = input_allocate_device();
>> +	input = devm_input_allocate_device(dev);
>>  	if (!input)
>>  		return -ENOMEM;
>>  
>> @@ -1134,11 +1133,8 @@ static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
>>  
>>  	lradc->ts_input = input;
>>  	input_set_drvdata(input, lradc);
>> -	ret = input_register_device(input);
>> -	if (ret)
>> -		input_free_device(lradc->ts_input);
>>  
>> -	return ret;
>> +	return input_register_device(input);
>>  }
>>  
>>  static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
>>
> Nice find.
>
> Looks like at91_adc.c and exynos_adc.c suffer from the exact same issue.
> The leak looks a bit more severe on exynos even, exynos_adc_ts_init()
> could use a proper fail path. Do you want to send patches or shall I ?
>

since you found them it would be better if you handle them.

Regards
Stefan