linux-kernel - Re: [PATCH] media: staging: tegra-vde: add missing pm_runtime_put

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Date:   Fri, 5 Jun 2020 17:05:46 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Jon Hunter <jonathanh@...dia.com>,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, wu000273@....edu, kjlu@....edu, smccaman@....edu
Subject: Re: [PATCH] media: staging: tegra-vde: add missing
 pm_runtime_put_autosuspend

05.06.2020 09:00, Jon Hunter пишет:
> 
> On 02/06/2020 06:48, Navid Emamdoost wrote:
>> Call to pm_runtime_get_sync increments counter even in case of
>> failure leading to incorrect ref count.
>> Call pm_runtime_put_autosuspend if pm_runtime_get_sync fails.
>>
>> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
>> ---
>>  drivers/staging/media/tegra-vde/vde.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/media/tegra-vde/vde.c b/drivers/staging/media/tegra-vde/vde.c
>> index d3e63512a765..52cdd4a91e93 100644
>> --- a/drivers/staging/media/tegra-vde/vde.c
>> +++ b/drivers/staging/media/tegra-vde/vde.c
>> @@ -776,8 +776,10 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
>>  		goto release_dpb_frames;
>>  
>>  	ret = pm_runtime_get_sync(dev);
>> -	if (ret < 0)
>> +	if (ret < 0) {
>> +		pm_runtime_put_autosuspend(dev);
>>  		goto unlock;
>> +	}
>>  
>>  	/*
>>  	 * We rely on the VDE registers reset value, otherwise VDE
> 
> Please use the put in the error path.

This is a third version of the patch [1][2].

[1]
https://patchwork.ozlabs.org/project/linux-tegra/patch/20200514210847.9269-2-digetx@gmail.com/
[2]
https://patchwork.ozlabs.org/project/linux-tegra/patch/20200520095148.10995-1-dinghao.liu@zju.edu.cn/

I'd prefer to stick with my variant of the patch [1] because in my
opinion it's most straightforward variant and I actually tested that it
works properly.

Navid, anyways thank you for the patch. Next time please check if
somebody else already sent similar patches before you.