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

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Date: Mon, 4 Mar 2024 11:49:53 -0600
From: Alex Elder <elder@...e.org>
To: Rui Miguel Silva <rmfrfs@...il.com>,
 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

On 3/4/24 3:17 AM, Rui Miguel Silva wrote:
> 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>

Looks good.

Reviewed-by: Alex Elder <elder@...aro.org>

> 
> 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