linux-kernel - Re: [PATCH] platform/x86/intel-uncore-freq: Conditionally create attribute for read frequency

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Date:   Mon, 2 Oct 2023 15:01:26 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
cc:     Hans de Goede <hdegoede@...hat.com>, markgross@...nel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86/intel-uncore-freq: Conditionally create
 attribute for read frequency

On Mon, 2 Oct 2023, Srinivas Pandruvada wrote:

> When the current uncore frequency can't be read, don't create attribute
> "current_freq_khz" as any read will fail later. Some user space
> applications like turbostat fail to continue with the failure. So, check
> error during attribute creation.
> 
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

Should there be a Fixes tag?

-- 
 i.

> ---
>  .../x86/intel/uncore-frequency/uncore-frequency-common.c  | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> 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 1152deaa0078..33ab207493e3 100644
> --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
> +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
> @@ -176,7 +176,7 @@ show_uncore_data(initial_max_freq_khz);
>  
>  static int create_attr_group(struct uncore_data *data, char *name)
>  {
> -	int ret, index = 0;
> +	int ret, freq, index = 0;
>  
>  	init_attribute_rw(max_freq_khz);
>  	init_attribute_rw(min_freq_khz);
> @@ -197,7 +197,11 @@ static int create_attr_group(struct uncore_data *data, char *name)
>  	data->uncore_attrs[index++] = &data->min_freq_khz_dev_attr.attr;
>  	data->uncore_attrs[index++] = &data->initial_min_freq_khz_dev_attr.attr;
>  	data->uncore_attrs[index++] = &data->initial_max_freq_khz_dev_attr.attr;
> -	data->uncore_attrs[index++] = &data->current_freq_khz_dev_attr.attr;
> +
> +	ret = uncore_read_freq(data, &freq);
> +	if (!ret)
> +		data->uncore_attrs[index++] = &data->current_freq_khz_dev_attr.attr;
> +
>  	data->uncore_attrs[index] = NULL;
>  
>  	data->uncore_attr_group.name = name;
>