linux-kernel - Re: [PATCH] mailbox: zynqmp-ipi-mailbox: Add of_node

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Message-ID: <ab6db31d-ff16-5a32-f097-347daa6b98fc@gmail.com>
Date:   Fri, 2 Aug 2019 10:29:49 +0530
From:   Nishka Dasgupta <nishkadg.linux@...il.com>
To:     Michal Simek <michal.simek@...inx.com>, jassisinghbrar@...il.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] mailbox: zynqmp-ipi-mailbox: Add of_node_put() before
 goto

On 31/07/19 7:51 PM, Michal Simek wrote:
> On 31. 07. 19 15:06, Nishka Dasgupta wrote:
>> On 31/07/19 2:01 PM, Michal Simek wrote:
>>> On 09. 07. 19 19:28, Nishka Dasgupta wrote:
>>>> Each iteration of for_each_available_child_of_node puts the previous
>>>> node, but in the case of a goto from the middle of the loop, there is
>>>> no put, thus causing a memory leak. Hence add an of_node_put before the
>>>> goto.
>>>> Issue found with Coccinelle.
>>>>
>>>> Signed-off-by: Nishka Dasgupta <nishkadg.linux@...il.com>
>>>> ---
>>>>    drivers/mailbox/zynqmp-ipi-mailbox.c | 1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c
>>>> b/drivers/mailbox/zynqmp-ipi-mailbox.c
>>>> index 86887c9a349a..bd80d4c10ec2 100644
>>>> --- a/drivers/mailbox/zynqmp-ipi-mailbox.c
>>>> +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
>>>> @@ -661,6 +661,7 @@ static int zynqmp_ipi_probe(struct
>>>> platform_device *pdev)
>>>>            if (ret) {
>>>>                dev_err(dev, "failed to probe subdev.\n");
>>>>                ret = -EINVAL;
>>>> +            of_node_put(nc);
>>>>                goto free_mbox_dev;
>>>>            }
>>>>            mbox++;
>>>>
>>>
>>> Patch is good but when you are saying that this was found by Coccinelle
>>> then it should be added as script to kernel to detect it.
>>
>> This particular patch was suggested by a script I did not write myself;
>> someone else wrote it and sent it to me. How should I proceed in this case?
> 
> You can ask him to submit it to kernel.
> Or you can take it, keep his authorship and send it to:

I have asked her to submit this script, thank you. Will I need to 
resubmit this patch, however?

Regards,
Nishka

> ./scripts/get_maintainer.pl -f scripts/coccinelle/
> Julia Lawall <Julia.Lawall@...6.fr> (supporter:COCCINELLE/Semantic
> Patches (SmPL))
> Gilles Muller <Gilles.Muller@...6.fr> (supporter:COCCINELLE/Semantic
> Patches (SmPL))
> Nicolas Palix <nicolas.palix@...g.fr> (supporter:COCCINELLE/Semantic
> Patches (SmPL))
> Michal Marek <michal.lkml@...kovi.net> (supporter:COCCINELLE/Semantic
> Patches (SmPL))
> cocci@...teme.lip6.fr (moderated list:COCCINELLE/Semantic Patches (SmPL))
> linux-kernel@...r.kernel.org (open list)
> 
> Thanks,
> Michal
>