linux-kernel - [PATCH] thermal: intel: intel_soc_dts_iosf: Fix thermal

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Date:   Fri, 11 Aug 2023 16:45:23 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     rafael.j.wysocki@...el.com
Cc:     daniel.lezcano@...aro.or, srinivas.pandruvada@...el.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH] thermal: intel: intel_soc_dts_iosf: Fix thermal_zone removal

All of the existing callers of remove_dts_thermal_zone() pass a valid
pointer as the argument, so checking for the NULL pointer is redundant.

Plus, when calling remove_dts_thermal_zone() from
intel_soc_dts_iosf_init(), it is possible that
1. dts->tzone is an error pointer, when the sensor fails to be
   registered as a valid thermal zone
2. dts->tzone is unregistered in add_dts_thermal_zone(), when some
   failure occurs after thermal zone registered
In both cases, there is no need to unregister dts->tzone in
remove_dts_thermal_zone().

Clear dst->tzone when add_dts_thermal_zone() fails. And do thermal zone
removal in remove_dts_thermal_zone() only when dts->tzone is set.

Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
 drivers/thermal/intel/intel_soc_dts_iosf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/intel/intel_soc_dts_iosf.c b/drivers/thermal/intel/intel_soc_dts_iosf.c
index 7a66d0f077b0..c5203ba8f0b9 100644
--- a/drivers/thermal/intel/intel_soc_dts_iosf.c
+++ b/drivers/thermal/intel/intel_soc_dts_iosf.c
@@ -212,7 +212,7 @@ static int soc_dts_enable(int id)

 static void remove_dts_thermal_zone(struct intel_soc_dts_sensor_entry *dts)
 {
-	if (dts) {
+	if (dts->tzone) {
 		iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 			       SOC_DTS_OFFSET_ENABLE, dts->store_status);
 		thermal_zone_device_unregister(dts->tzone);
@@ -277,6 +277,7 @@ static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
 err_enable:
 	thermal_zone_device_unregister(dts->tzone);
 err_ret:
+	dts->tzone = NULL;
 	return ret;
 }

-- 
2.34.1