linux-kernel - Re: [PATCH 1/2] media: ov5645: Fix write

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Date:   Tue, 6 Mar 2018 10:40:10 -0300
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     Todor Tomov <todor.tomov@...aro.org>
Cc:     sakari.ailus@...ux.intel.com, hverkuil@...all.nl,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: ov5645: Fix write_reg return code

Em Thu,  8 Feb 2018 11:41:59 +0200
Todor Tomov <todor.tomov@...aro.org> escreveu:

> I2C transfer functions return number of successful operations (on success).
> 
> Do not return the received positive return code but instead return 0 on
> success. The users of write_reg function already use this logic.
> 
> Signed-off-by: Todor Tomov <todor.tomov@...aro.org>
> ---
>  drivers/media/i2c/ov5645.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> index d28845f..9755562 100644
> --- a/drivers/media/i2c/ov5645.c
> +++ b/drivers/media/i2c/ov5645.c
> @@ -600,11 +600,13 @@ static int ov5645_write_reg(struct ov5645 *ov5645, u16 reg, u8 val)
>  	regbuf[2] = val;
>  
>  	ret = i2c_master_send(ov5645->i2c_client, regbuf, 3);
> -	if (ret < 0)
> +	if (ret < 0) {
>  		dev_err(ov5645->dev, "%s: write reg error %d: reg=%x, val=%x\n",
>  			__func__, ret, reg, val);
> +		return ret;
> +	}

Actually, if ret < 3, it should return an error too (like -EREMOTEIO 
or -EIO).

>  
> -	return ret;
> +	return 0;
>  }
>  
>  static int ov5645_read_reg(struct ov5645 *ov5645, u16 reg, u8 *val)



Thanks,
Mauro