linux-kernel - Re: [PATCH v2 1/4] staging: vc04_services: Stop leaking platform device on error path

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Date:   Fri, 23 Dec 2022 10:58:31 +0530
From:   Umang Jain <umang.jain@...asonboard.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Adrien Thierry <athierry@...hat.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Dan Carpenter <error27@...il.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Phil Elwell <phil@...pberrypi.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>
Subject: Re: [PATCH v2 1/4] staging: vc04_services: Stop leaking platform
 device on error path

Hi,

On 12/23/22 2:00 AM, Laurent Pinchart wrote:
> Hi Umang,
>
> Thank you for the patch.
>
> On Fri, Dec 23, 2022 at 12:44:57AM +0530, Umang Jain wrote:
>> vchiq driver registers the child platform devices in
>> vchiq_register_child(). However, in the registration error code path,
>> currently the driver is leaking platform devices by not destroying the
>> return platform device. Plug this leak using platform_device_put() as
>> mentioned in the documentation for platform_device_register().
>>
>> Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
>> ---
>>   drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
>> index dc33490ba7fb..fc7ea7ba97b2 100644
>> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
>> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
>> @@ -1779,6 +1779,7 @@ vchiq_register_child(struct platform_device *pdev, const char *name)
>>   	child = platform_device_register_full(&pdevinfo);
>>   	if (IS_ERR(child)) {
>>   		dev_warn(&pdev->dev, "%s not registered\n", name);
>> +		platform_device_put(child);
> If IS_ERR(child), what do you expect platform_device_put(child) to do ?
> And have you read the implementation of platform_device_register_full()
> ?

Errr, yeah - it is handling the platform_device_put() as well. Stupid me!

(dropping this patch for v3)
>
>>   		child = NULL;
>>   	}
>>