[PATCH] iwlwifi, Do not implement thermal zone unless ucode is loaded

[Prarit Bhargava]

The iwlwifi driver implements a thermal zone and hwmon device, but
returns -EIO on temperature reads if the firmware isn't loaded.  This
results in the error

iwlwifi-virtual-0
Adapter: Virtual device
ERROR: Can't get value of subfeature temp1_input: I/O error
temp1:            N/A

being output when using sensors from the lm-sensors package.  Since
the temperature cannot be read unless the ucode is loaded there is no
reason to add the interface only to have it return an error 100% of
the time.

This patch moves the firmware check to iwl_mvm_thermal_zone_register() and
stops the thermal zone from being created if the ucode hasn't been loaded.

Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Johannes Berg <johannes.berg@xxxxxxxxx>
Cc: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Cc: Luca Coelho <luciano.coelho@xxxxxxxxx>
Cc: Intel Linux Wireless <linuxwifi@xxxxxxxxx>
Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Cc: Chaya Rachel Ivgi <chaya.rachel.ivgi@xxxxxxxxx>
Cc: Sara Sharon <sara.sharon@xxxxxxxxx>
Cc: linux-wireless@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
---
 drivers/net/wireless/intel/iwlwifi/mvm/tt.c |   13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tt.c b/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
index 58fc7b3c711c..64802659711f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
@@ -634,11 +634,6 @@ static int iwl_mvm_tzone_get_temp(struct thermal_zone_device *device,
 
 	mutex_lock(&mvm->mutex);
 
-	if (!mvm->ucode_loaded || !(mvm->cur_ucode == IWL_UCODE_REGULAR)) {
-		ret = -EIO;
-		goto out;
-	}
-
 	ret = iwl_mvm_get_temp(mvm, &temp);
 	if (ret)
 		goto out;
@@ -684,11 +679,6 @@ static int iwl_mvm_tzone_set_trip_temp(struct thermal_zone_device *device,
 
 	mutex_lock(&mvm->mutex);
 
-	if (!mvm->ucode_loaded || !(mvm->cur_ucode == IWL_UCODE_REGULAR)) {
-		ret = -EIO;
-		goto out;
-	}
-
 	if (trip < 0 || trip >= IWL_MAX_DTS_TRIPS) {
 		ret = -EINVAL;
 		goto out;
@@ -750,6 +740,9 @@ static void iwl_mvm_thermal_zone_register(struct iwl_mvm *mvm)
 		return;
 	}
 
+	if (!mvm->ucode_loaded || !(mvm->cur_ucode == IWL_UCODE_REGULAR))
+		return;
+
 	BUILD_BUG_ON(ARRAY_SIZE(name) >= THERMAL_NAME_LENGTH);
 
 	mvm->tz_device.tzone = thermal_zone_device_register(name,
-- 
1.7.9.3