linux-kernel - Re: [PATCH v1 1/3] driver core: move core part of device

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Date:   Fri, 24 Nov 2023 15:07:11 +0000
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Brown <broonie@...nel.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-pm@...r.kernel.org,
        Søren Andersen <san@...v.dk>
Subject: Re: [PATCH v1 1/3] driver core: move core part of device_shutdown()
 to a separate function

On Fri, Nov 24, 2023 at 03:53:36PM +0100, Oleksij Rempel wrote:
> Split the device_shutdown() as a preparation for the prioritization
> support.

Nit, this is going to need a lot more description, as at this point in
time, we do not know what "prioritization support" is.

> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/base/core.c | 110 +++++++++++++++++++++++++-------------------
>  1 file changed, 63 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 67ba592afc77..0f5646a097d3 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -4719,12 +4719,73 @@ int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
>  }
>  EXPORT_SYMBOL_GPL(device_change_owner);
>  
> +/**

This doesn't need kernel-doc for a static function, right?

> + * device_shutdown_one - shut down a device
> + * @dev: device to shut down
> + *
> + * It is called with the device lock held.
> + *
> + * The device must be on the devices_kset list.
> + */
> +static void device_shutdown_one_locked(struct device *dev)
> +{
> +	struct device *parent;
> +
> +	lockdep_assert_held(&devices_kset->list_lock);
> +	/*
> +	 * hold reference count of device's parent to
> +	 * prevent it from being freed because parent's
> +	 * lock is to be held
> +	 */
> +	parent = get_device(dev->parent);
> +	get_device(dev);
> +	/*

As you are moving the code, might as well make it a bit prettier and add
proper line breaks before the comments please.

thanks,

greg k-h