On Fri, Mar 3, 2023 at 7:52 PM Greg KH gregkh@linuxfoundation.org wrote:
On Fri, Mar 03, 2023 at 08:19:09AM -0800, Srinivas Pandruvada wrote:
From: Srinivas Pandruvada srinivas.pandruvada@intel.com
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.
Signed-off-by: Srinivas Pandruvada srinivas.pandruvada@intel.com Cc: stable@vger.kernel.org
The commit which caused this issue was added during v6.2 cycle.
What commit exactly? Always list that as a Fixes: tag if you know this.
It's there in the changelog above.
I'll add a Fixes: tag to this one when applying it.
Cheers!