linux-kernel - [PATCH v1 2/3] iwlwifi: mvm: Populate trip table before registering thermal zone

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Date: Wed, 07 Feb 2024 20:10:24 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: Gregory Greenman <gregory.greenman@...el.com>,
 Miri Korenblit <miriam.rachel.korenblit@...el.com>,
 Kalle Valo <kvalo@...nel.org>, Johannes Berg <johannes.berg@...el.com>,
 linux-wireless@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
Subject:
 [PATCH v1 2/3] iwlwifi: mvm: Populate trip table before registering thermal
 zone

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The trip table in iwl_mvm_thermal_zone_register() is populated after
passing it to thermal_zone_device_register_with_trips(), so it may be
accessed (for instance, via sysfs) before it is ready.

To prevent that from happening, modify the function to populate the
trip table before calling thermal_zone_device_register_with_trips().

Also make the code use THERMAL_TEMP_INVALID as the "invalid temperature"
value which is also meaningful for the core.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/tt.c |   19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

Index: linux-pm/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
===================================================================
--- linux-pm.orig/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
+++ linux-pm/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
@@ -575,7 +575,7 @@ int iwl_mvm_send_temp_report_ths_cmd(str

 	/* compress trips to cmd array, remove uninitialized values*/
 	for (i = 0; i < IWL_MAX_DTS_TRIPS; i++) {
-		if (mvm->tz_device.trips[i].temperature != INT_MIN) {
+		if (mvm->tz_device.trips[i].temperature != THERMAL_TEMP_INVALID) {
 			cmd.thresholds[idx++] =
 				cpu_to_le16((s16)(mvm->tz_device.trips[i].temperature / 1000));
 		}
@@ -675,6 +675,14 @@ static void iwl_mvm_thermal_zone_registe
 	BUILD_BUG_ON(ARRAY_SIZE(name) >= THERMAL_NAME_LENGTH);

 	sprintf(name, "iwlwifi_%u", atomic_inc_return(&counter) & 0xFF);
+	/*
+	 * 0 is a valid temperature,
+	 * so initialize the array with S16_MIN which invalid temperature
+	 */
+	for (i = 0 ; i < IWL_MAX_DTS_TRIPS; i++) {
+		mvm->tz_device.trips[i].temperature = THERMAL_TEMP_INVALID;
+		mvm->tz_device.trips[i].type = THERMAL_TRIP_PASSIVE;
+	}
 	mvm->tz_device.tzone = thermal_zone_device_register_with_trips(name,
 							mvm->tz_device.trips,
 							IWL_MAX_DTS_TRIPS,
@@ -693,15 +701,6 @@ static void iwl_mvm_thermal_zone_registe
 	if (ret) {
 		IWL_DEBUG_TEMP(mvm, "Failed to enable thermal zone\n");
 		thermal_zone_device_unregister(mvm->tz_device.tzone);
-		return;
-	}
-
-	/* 0 is a valid temperature,
-	 * so initialize the array with S16_MIN which invalid temperature
-	 */
-	for (i = 0 ; i < IWL_MAX_DTS_TRIPS; i++) {
-		mvm->tz_device.trips[i].temperature = INT_MIN;
-		mvm->tz_device.trips[i].type = THERMAL_TRIP_PASSIVE;
 	}
 }