On Fri, Mar 3, 2023 at 5:19 PM Srinivas Pandruvada srinivas.pandruvada@linux.intel.com 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.
.../intel/int340x_thermal/processor_thermal_device_pci.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c index bf1b1cdfade4..acc11ad56975 100644 --- 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 thermal_zone_device *tzd, int trip, int temp 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 pci_dev *pdev, const struct pci_device_ goto err_free_vectors; }
ret = thermal_zone_device_enable(pci_info->tzone);if (ret)goto err_free_vectors;return 0;err_free_vectors:
Now queued up for 6.3-rc with a Fixes: tag added, thanks!