linux-kernel - Re: [PATCH] staging: greybus: fix get_channel_from

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Date: Mon, 04 Mar 2024 09:17:36 +0000
From: Rui Miguel Silva <rmfrfs@...il.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>, Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>, greybus-dev@...ts.linaro.org,
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: fix get_channel_from_mode() failure path

Hi Dan,
once again thanks for the patch.

Dan Carpenter <dan.carpenter@...aro.org> writes:

> The get_channel_from_mode() function is supposed to return the channel
> which matches the mode.  But it has a bug where if it doesn't find a
> matching channel then it returns the last channel.  It should return
> NULL instead.
>
> Also remove an unnecessary NULL check on "channel".
>
> Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Reviewed-by: Rui Miguel Silva <rmfrfs@...il.com>

Cheers,
  Rui

> ---
>  drivers/staging/greybus/light.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
> index d62f97249aca..a5c2fe963866 100644
> --- a/drivers/staging/greybus/light.c
> +++ b/drivers/staging/greybus/light.c
> @@ -95,15 +95,15 @@ static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
>  static struct gb_channel *get_channel_from_mode(struct gb_light *light,
>  						u32 mode)
>  {
> -	struct gb_channel *channel = NULL;
> +	struct gb_channel *channel;
>  	int i;
>  
>  	for (i = 0; i < light->channels_count; i++) {
>  		channel = &light->channels[i];
> -		if (channel && channel->mode == mode)
> -			break;
> +		if (channel->mode == mode)
> +			return channel;
>  	}
> -	return channel;
> +	return NULL;
>  }
>  
>  static int __gb_lights_flash_intensity_set(struct gb_channel *channel,
> -- 
> 2.43.0