linux-kernel - Re: [PATCH] counter: Set counter device name

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Date:   Thu, 3 Feb 2022 10:00:53 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     jic23@...nel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] counter: Set counter device name

On Thu, Feb 03, 2022 at 04:34:59PM +0900, William Breathitt Gray wrote:
> Naming the counter device provides a convenient way to identify it in
> devres_log events and similar situations. This patch names the counter
> device by combining the prefix "counter" with the counter device's
> unique ID.
> 
> Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
> ---
>  drivers/counter/counter-core.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
> index 7e0957eea094..2ebd9adf0bd2 100644
> --- a/drivers/counter/counter-core.c
> +++ b/drivers/counter/counter-core.c
> @@ -22,6 +22,8 @@
>  #include "counter-chrdev.h"
>  #include "counter-sysfs.h"
>  
> +#define COUNTER_NAME	"counter"
> +
>  /* Provides a unique ID for each counter device */
>  static DEFINE_IDA(counter_ida);
>  
> @@ -104,6 +106,10 @@ struct counter_device *counter_alloc(size_t sizeof_priv)
>  		goto err_ida_alloc;
>  	dev->id = err;
>  
> +	err = dev_set_name(dev, COUNTER_NAME "%d", dev->id);
> +	if (err)
> +		goto err_dev_set_name;
> +
>  	mutex_init(&counter->ops_exist_lock);
>  	dev->type = &counter_device_type;
>  	dev->bus = &counter_bus_type;
> @@ -119,6 +125,9 @@ struct counter_device *counter_alloc(size_t sizeof_priv)
>  
>  err_chrdev_add:
>  
> +	kfree(dev_name(dev));
> +err_dev_set_name:
> +

I think this is wrong as kobject_cleanup frees the name.

Best regards
Uwe


-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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