linux-kernel - Re: [PATCH] platform/x86/amd/hsmp: switch to use device_add

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Date: Mon, 29 Jan 2024 14:46:45 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    Suma Hegde <suma.hegde@....com>
cc: naveenkrishna.chatradhi@....com, LKML <linux-kernel@...r.kernel.org>, 
    Carlos Bilbao <carlos.bilbao@....com>, Hans de Goede <hdegoede@...hat.com>, 
    platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] platform/x86/amd/hsmp: switch to use
 device_add_groups()

+ Cc Suma Hegde.

On Sun, 28 Jan 2024, Greg Kroah-Hartman wrote:

> The use of devm_*() functions works properly for when the device
> structure itself is dynamic, but the hsmp driver is attempting to have a
> local, static, struct device and then calls devm_() functions attaching
> memory to the device that will never be freed.
> 
> The logic of having a static struct device is almost never a wise
> choice, but for now, just remove the use of devm_device_add_groups() in
> this driver as it obviously is not needed.
> 
> Cc: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@....com>
> Cc: Carlos Bilbao <carlos.bilbao@....com>
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: "Ilpo Järvinen" <ilpo.jarvinen@...ux.intel.com>
> Cc: platform-driver-x86@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/platform/x86/amd/hsmp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/amd/hsmp.c b/drivers/platform/x86/amd/hsmp.c
> index b55d80e29139..49ef0b1d6df0 100644
> --- a/drivers/platform/x86/amd/hsmp.c
> +++ b/drivers/platform/x86/amd/hsmp.c
> @@ -471,7 +471,7 @@ static int hsmp_create_sysfs_interface(void)
>  		if (ret)
>  			return ret;
>  	}
> -	return devm_device_add_groups(plat_dev.dev, hsmp_attr_grps);
> +	return device_add_groups(plat_dev.dev, hsmp_attr_grps);
>  }

Thanks Greg for bringing this up. I've added Suma who has some patches 
which change code around this area.

-- 
 i.