linux-kernel - Re: [PATCH 3/10] iio: at91_adc: Cocci spatch "noderef"

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Date:	Fri, 20 Sep 2013 19:42:38 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	Thomas Meyer <thomas@...3r.de>, jic23@....ac.uk,
	grant.likely@...aro.org, rob.herring@...xeda.com,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 3/10] iio: at91_adc: Cocci spatch "noderef"

On 09/20/13 19:36, Jonathan Cameron wrote:
> On 09/20/13 08:26, Nicolas Ferre wrote:
>> On 19/09/2013 23:42, Thomas Meyer :
>>> sizeof when applied to a pointer typed expression gives the size of the
>>> pointer.
>>> Found by coccinelle spatch "misc/noderef.cocci"
>>>
>>> Signed-off-by: Thomas Meyer <thomas@...3r.de>
>>
>> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> Applied to the fixes-togreg branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git

Actually, change of plan. Applied to the togreg branch of that
tree.  Whilst technically more correct to have it as you say,
we are dealing with the size of a struct iio_trig ** vs
a struct iio_trig *  so it isn't actually a bug, just a
less than ideal bit of code ;)

It was so obviously a fix I didn't initially check if it
was a 'real' bug or not. oops.

Jonathan


> 
> Thanks,
>>
>>> ---
>>>
>>> diff -u -p a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
>>> --- a/drivers/iio/adc/at91_adc.c
>>> +++ b/drivers/iio/adc/at91_adc.c
>>> @@ -279,7 +279,7 @@ static int at91_adc_trigger_init(struct
>>>       int i, ret;
>>>
>>>       st->trig = devm_kzalloc(&idev->dev,
>>> -                st->trigger_number * sizeof(st->trig),
>>> +                st->trigger_number * sizeof(*st->trig),
>>>                   GFP_KERNEL);
>>>
>>>       if (st->trig == NULL) {
>>> -- 
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>>
>>
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