Patch "hwmon: (coretemp) Fix bogus core_id to attr name mapping" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    hwmon: (coretemp) Fix bogus core_id to attr name mapping

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hwmon-coretemp-fix-bogus-core_id-to-attr-name-mappin.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d828c66babe47e413fa9a9f60052fc4e0eabfe2d
Author: Zhang Rui <rui.zhang@xxxxxxxxx>
Date:   Fri Feb 2 17:21:35 2024 +0800

    hwmon: (coretemp) Fix bogus core_id to attr name mapping
    
    [ Upstream commit fdaf0c8629d4524a168cb9e4ad4231875749b28c ]
    
    Before commit 7108b80a542b ("hwmon/coretemp: Handle large core ID
    value"), there is a fixed mapping between
    1. cpu_core_id
    2. the index in pdata->core_data[] array
    3. the sysfs attr name, aka "tempX_"
    The later two always equal cpu_core_id + 2.
    
    After the commit, pdata->core_data[] index is got from ida so that it
    can handle sparse core ids and support more cores within a package.
    
    However, the commit erroneously maps the sysfs attr name to
    pdata->core_data[] index instead of cpu_core_id + 2.
    
    As a result, the code is not aligned with the comments, and brings user
    visible changes in hwmon sysfs on systems with sparse core id.
    
    For example, before commit 7108b80a542b ("hwmon/coretemp: Handle large
    core ID value"),
    /sys/class/hwmon/hwmon2/temp2_label:Core 0
    /sys/class/hwmon/hwmon2/temp3_label:Core 1
    /sys/class/hwmon/hwmon2/temp4_label:Core 2
    /sys/class/hwmon/hwmon2/temp5_label:Core 3
    /sys/class/hwmon/hwmon2/temp6_label:Core 4
    /sys/class/hwmon/hwmon3/temp10_label:Core 8
    /sys/class/hwmon/hwmon3/temp11_label:Core 9
    after commit,
    /sys/class/hwmon/hwmon2/temp2_label:Core 0
    /sys/class/hwmon/hwmon2/temp3_label:Core 1
    /sys/class/hwmon/hwmon2/temp4_label:Core 2
    /sys/class/hwmon/hwmon2/temp5_label:Core 3
    /sys/class/hwmon/hwmon2/temp6_label:Core 4
    /sys/class/hwmon/hwmon2/temp7_label:Core 8
    /sys/class/hwmon/hwmon2/temp8_label:Core 9
    
    Restore the previous behavior and rework the code, comments and variable
    names to avoid future confusions.
    
    Fixes: 7108b80a542b ("hwmon/coretemp: Handle large core ID value")
    Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20240202092144.71180-3-rui.zhang@xxxxxxxxx
    Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 10e1d189a619..ecee12d0346b 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -380,7 +380,7 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 }
 
 static int create_core_attrs(struct temp_data *tdata, struct device *dev,
-			     int attr_no)
+			     int index)
 {
 	int i;
 	static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
@@ -392,13 +392,20 @@ static int create_core_attrs(struct temp_data *tdata, struct device *dev,
 	};
 
 	for (i = 0; i < tdata->attr_size; i++) {
+		/*
+		 * We map the attr number to core id of the CPU
+		 * The attr number is always core id + 2
+		 * The Pkgtemp will always show up as temp1_*, if available
+		 */
+		int attr_no = tdata->is_pkg_data ? 1 : tdata->cpu_core_id + 2;
+
 		snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH,
 			 "temp%d_%s", attr_no, suffixes[i]);
 		sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
 		tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
 		tdata->sd_attrs[i].dev_attr.attr.mode = 0444;
 		tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
-		tdata->sd_attrs[i].index = attr_no;
+		tdata->sd_attrs[i].index = index;
 		tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
 	}
 	tdata->attr_group.attrs = tdata->attrs;
@@ -456,23 +463,22 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu,
 	struct platform_data *pdata = platform_get_drvdata(pdev);
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
 	u32 eax, edx;
-	int err, index, attr_no;
+	int err, index;
 
 	/*
-	 * Find attr number for sysfs:
-	 * We map the attr number to core id of the CPU
-	 * The attr number is always core id + 2
-	 * The Pkgtemp will always show up as temp1_*, if available
+	 * Get the index of tdata in pdata->core_data[]
+	 * tdata for package: pdata->core_data[1]
+	 * tdata for core: pdata->core_data[2] .. pdata->core_data[NUM_REAL_CORES + 1]
 	 */
 	if (pkg_flag) {
-		attr_no = PKG_SYSFS_ATTR_NO;
+		index = PKG_SYSFS_ATTR_NO;
 	} else {
 		index = ida_alloc_max(&pdata->ida, NUM_REAL_CORES - 1, GFP_KERNEL);
 		if (index < 0)
 			return index;
 
 		pdata->cpu_map[index] = topology_core_id(cpu);
-		attr_no = index + BASE_SYSFS_ATTR_NO;
+		index += BASE_SYSFS_ATTR_NO;
 	}
 
 	tdata = init_temp_data(cpu, pkg_flag);
@@ -504,20 +510,20 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu,
 		}
 	}
 
-	pdata->core_data[attr_no] = tdata;
+	pdata->core_data[index] = tdata;
 
 	/* Create sysfs interfaces */
-	err = create_core_attrs(tdata, pdata->hwmon_dev, attr_no);
+	err = create_core_attrs(tdata, pdata->hwmon_dev, index);
 	if (err)
 		goto exit_free;
 
 	return 0;
 exit_free:
-	pdata->core_data[attr_no] = NULL;
+	pdata->core_data[index] = NULL;
 	kfree(tdata);
 ida_free:
 	if (!pkg_flag)
-		ida_free(&pdata->ida, index);
+		ida_free(&pdata->ida, index - BASE_SYSFS_ATTR_NO);
 	return err;
 }
 




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