linux-kernel - Re: [PATCH 1/1] hwmon: (ina2xx) initialize mutex before locking

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Date:   Mon, 16 Apr 2018 10:28:58 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ahsan Hussain <ahsan_hussain@...tor.com>
Cc:     jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        chombour <Cedric_Hombourger@...tor.com>,
        ahsann <Noor_Ahsan@...tor.com>, m.purski@...sung.com
Subject: Re: [PATCH 1/1] hwmon: (ina2xx) initialize mutex before locking

On Mon, Apr 16, 2018 at 10:08:19PM +0500, Ahsan Hussain wrote:
> 
> Upstream commit
> 
> 8d008c0c ("hwmon: (ina2xx) Make calibration register value fixed")
> 
This doesn't have to be on separate lines; as written, it just causes
confusion.

> makes ina2xx_set_shunt() call mutex_lock on an un-initialized mutex.
> Initialize it prior so we don't get a NULL pointer dereference error
> 
> Signed-off-by: Ahsan Hussain <ahsan_hussain@...tor.com>

Good find, but your patch is corrupted to the point where any attenpt to
fix it up on my side failed. Please resend without corruption, and please
provide a Fixes: line.

Thanks,
Guenter

> ---
>  drivers/hwmon/ina2xx.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c
> index a629f7c..1304f01 100644
> --- a/drivers/hwmon/ina2xx.c
> +++ b/drivers/hwmon/ina2xx.c
> @@ -457,6 +457,8 @@ static int ina2xx_probe(struct i2c_client *client,
>  			val = INA2XX_RSHUNT_DEFAULT;
>  	}
>  +	mutex_init(&data->config_lock);
> +
>  	ina2xx_set_shunt(data, val);
>   	ina2xx_regmap_config.max_register = data->config->registers;
> @@ -473,8 +475,6 @@ static int ina2xx_probe(struct i2c_client *client,
>  		return -ENODEV;
>  	}
>  -	mutex_init(&data->config_lock);
> -
>  	data->groups[group++] = &ina2xx_group;
>  	if (id->driver_data == ina226)
>  		data->groups[group++] = &ina226_group;
> -- 
> 2.7.4
>