linux-kernel - Re: [PATCH] media: tw9910: add missed clk_disable

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Date:   Sun, 30 Dec 2018 14:17:54 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: Re: [PATCH] media: tw9910: add missed clk_disable_unprepare() on
 failure path

Hi Jacopo,

On 30.12.2018 12:49, Jacopo Mondi wrote:
> On Sun, Dec 30, 2018 at 12:35:20AM +0300, Alexey Khoroshilov wrote:
>> If gpiod_get_optional() fails in tw9910_power_on(), clk is left undisabled.
> 
> Correct, thanks for spotting this.
> 
> I think pdn_gpio should also be handled if rstb_gpio fails.
> What's your opinion?

I would agree. I'll send v2.

Thank you,
Alexey

> 
>> Found by Linux Driver Verification project (linuxtesting.org).
>>
>> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
>> ---
>>  drivers/media/i2c/tw9910.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/media/i2c/tw9910.c b/drivers/media/i2c/tw9910.c
>> index a54548cc4285..109770d678d2 100644
>> --- a/drivers/media/i2c/tw9910.c
>> +++ b/drivers/media/i2c/tw9910.c
>> @@ -610,6 +610,7 @@ static int tw9910_power_on(struct tw9910_priv *priv)
>>  					     GPIOD_OUT_LOW);
>>  	if (IS_ERR(priv->rstb_gpio)) {
>>  		dev_info(&client->dev, "Unable to get GPIO \"rstb\"");
>> +		clk_disable_unprepare(priv->clk);
>>  		return PTR_ERR(priv->rstb_gpio);
>>  	}
>>
>> --
>> 2.7.4
>>