Re: [PATCH v3 7/7] nvmem: add a comment about resource management

[Srinivas Kandagatla]

On 19/02/2020 09:22, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
>
> The fact that part of the resources associated with the nvmem resources
> is freed by the release() callback in device_type caused me some
> confusion. Add a comment explaining that to nvmem_register().

I see this patch totally unnecessary!

I expect people creating patch in this area to understand what exactly 
they are doing. This is not going to help them in anyway, other than 
misleading and re-documenting device_add which is already available at

https://www.kernel.org/doc/html/v5.5/driver-api/infrastructure.html


thanks,
srini


> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> ---
>   drivers/nvmem/core.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index 40fe5913c264..6e28f3fddf53 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -397,6 +397,11 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
>   
>   	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
>   
> +	/*
> +	 * After calling device_add() we can stop freeing previously
> +	 * allocated resources - they'll be freed from nvmem_release()
> +	 * when the device's reference count drops to 0.
> +	 */
>   	rval = device_add(&nvmem->dev);
>   	if (rval)
>   		goto err_put_device;