Patch "thermal: intel: int340x: processor_thermal: Fix deadlock" has been added to the 6.2-stable tree

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

    thermal: intel: int340x: processor_thermal: Fix deadlock

to the 6.2-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:
     thermal-intel-int340x-processor_thermal-fix-deadlock.patch
and it can be found in the queue-6.2 subdirectory.

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


>From 52f04f10b9005ac4ce640da14a52ed7a146432fa Mon Sep 17 00:00:00 2001
From: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxx>
Date: Fri, 3 Mar 2023 08:19:09 -0800
Subject: thermal: intel: int340x: processor_thermal: Fix deadlock

From: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxx>

commit 52f04f10b9005ac4ce640da14a52ed7a146432fa upstream.

When user space updates the trip point there is a deadlock, which results
in caller gets blocked forever.

Commit 05eeee2b51b4 ("thermal/core: Protect sysfs accesses to thermal
operations with thermal zone mutex"), added a mutex for tz->lock in the
function trip_point_temp_store(). Hence, trip set callback() can't
call any thermal zone API as they are protected with the same mutex lock.

The callback here calling thermal_zone_device_enable(), which will result
in deadlock.

Move the thermal_zone_device_enable() to proc_thermal_pci_probe() to
avoid this deadlock.

Fixes: 05eeee2b51b4 ("thermal/core: Protect sysfs accesses to thermal operations with thermal zone mutex")
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxx>
Cc: 6.2+ <stable@xxxxxxxxxxxxxxx> # 6.2+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
@@ -194,7 +194,6 @@ static int sys_set_trip_temp(struct ther
 	proc_thermal_mmio_write(pci_info, PROC_THERMAL_MMIO_THRES_0, _temp);
 	proc_thermal_mmio_write(pci_info, PROC_THERMAL_MMIO_INT_ENABLE_0, 1);
 
-	thermal_zone_device_enable(tzd);
 	pci_info->stored_thres = temp;
 
 	return 0;
@@ -277,6 +276,10 @@ static int proc_thermal_pci_probe(struct
 		goto err_free_vectors;
 	}
 
+	ret = thermal_zone_device_enable(pci_info->tzone);
+	if (ret)
+		goto err_free_vectors;
+
 	return 0;
 
 err_free_vectors:


Patches currently in stable-queue which might be from srinivas.pandruvada@xxxxxxxxx are

queue-6.2/thermal-intel-int340x-processor_thermal-fix-deadlock.patch



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