linux-kernel - Re: [PATCH 05/36] platform/x86: intel-uncore-freq: move to use bus_get_dev

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Date:   Wed, 15 Mar 2023 13:46:34 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     rafael@...nel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 05/36] platform/x86: intel-uncore-freq: move to use
 bus_get_dev_root()

Hi,

On 3/13/23 19:28, Greg Kroah-Hartman wrote:
> Direct access to the struct bus_type dev_root pointer is going away soon
> so replace that with a call to bus_get_dev_root() instead, which is what
> it is there for.
> 
> Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: Mark Gross <markgross@...nel.org>
> Cc: platform-driver-x86@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
> Note, this is a patch that is a prepatory cleanup as part of a larger
> series of patches that is working on resolving some old driver core
> design mistakes.  It will build and apply cleanly on top of 6.3-rc2 on
> its own, but I'd prefer if I could take it through my driver-core tree
> so that the driver core changes can be taken through there for 6.4-rc1.

Taking this upstream through the driver-core tree is fine by me:

Acked-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans




> diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
> index cb24de9e97dc..1a300e14f350 100644
> --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
> +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
> @@ -224,9 +224,15 @@ int uncore_freq_common_init(int (*read_control_freq)(struct uncore_data *data, u
>  	uncore_write = write_control_freq;
>  	uncore_read_freq = read_freq;
>  
> -	if (!uncore_root_kobj)
> -		uncore_root_kobj = kobject_create_and_add("intel_uncore_frequency",
> -							    &cpu_subsys.dev_root->kobj);
> +	if (!uncore_root_kobj) {
> +		struct device *dev_root = bus_get_dev_root(&cpu_subsys);
> +
> +		if (dev_root) {
> +			uncore_root_kobj = kobject_create_and_add("intel_uncore_frequency",
> +								  &dev_root->kobj);
> +			put_device(dev_root);
> +		}
> +	}
>  	if (uncore_root_kobj)
>  		++uncore_instance_count;
>  	mutex_unlock(&uncore_lock);