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

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Message-Id: <20231004181915.1887913-1-srinivas.pandruvada@linux.intel.com>
Date:   Wed,  4 Oct 2023 11:19:15 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     hdegoede@...hat.com, markgross@...nel.org,
        ilpo.jarvinen@...ux.intel.com, andriy.shevchenko@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [UPDATE][PATCH] platform/x86/intel-uncore-freq: Conditionally create attribute for read frequency

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.

Fixes: 414eef27283a ("platform/x86/intel/uncore-freq: Display uncore current frequency")
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
Added fixes tag which added current_freq_khz. But after this
tag there is reorg of code, so need manual backport for some versions.
I will separately submit to stable trees after merge.

 .../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;
-- 
2.41.0