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

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Message-ID: <51e9925b-507c-9d26-bd58-24b49bf652b1@xilinx.com>
Date:   Fri, 2 Aug 2019 07:12:08 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Nishka Dasgupta <nishkadg.linux@...il.com>,
        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 02. 08. 19 6:59, Nishka Dasgupta wrote:
> 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?

I will let Jassi to decide.

Thanks,
Michal