linux-kernel - Re: [PATCH -next] media: rc: Fix a typo in lirc

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Message-ID: <20210601102506.GA13203@gofer.mess.org>
Date:   Tue, 1 Jun 2021 11:25:06 +0100
From:   Sean Young <sean@...s.org>
To:     Tong Tiangen <tongtiangen@...wei.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] media: rc: Fix a typo in lirc_ioctl

On Tue, Jun 01, 2021 at 06:02:35PM +0800, Tong Tiangen wrote:
> Fix a typo in lirc_ioctl, apparently min_timeout should be used
> in this case.
> 
> Fixes: e589333f346b ("V4L/DVB: IR: extend interfaces to support more device settings")
> Signed-off-by: Tong Tiangen <tongtiangen@...wei.com>
> ---
>  drivers/media/rc/lirc_dev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
> index 116daf90c858..abbeae2ccd4a 100644
> --- a/drivers/media/rc/lirc_dev.c
> +++ b/drivers/media/rc/lirc_dev.c
> @@ -534,7 +534,7 @@ static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  
>  	/* Generic timeout support */
>  	case LIRC_GET_MIN_TIMEOUT:
> -		if (!dev->max_timeout)
> +		if (!dev->min_timeout)

So maybe this isn't the clearest piece of code, but all rc drivers set
either both of min_timeout & max_timeout, or neither. Having a max_timeout
without a min_timeout does not make any sense.

Changing this to min_timeout gives the impression min_timeout can be set
without max_timeout, which is not the case. This should at least commented.

Thanks

Sean

>  			ret = -ENOTTY;
>  		else
>  			val = dev->min_timeout;
> -- 
> 2.18.0.huawei.25