linux-kernel - [PATCH v2] iwlwifi: mvm: adding check if the thermal firmware is running

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date: Fri, 17 May 2024 14:13:05 -0300
From: Guilherme Giacomo Simoes <trintaeoitogc@...il.com>
To: miriam.rachel.korenblit@...el.com,
	kvalo@...nel.org,
	rafael.j.wysocki@...el.com,
	daniel.lezcano@...aro.org,
	johannes.berg@...el.com,
	dmantipov@...dex.ru
Cc: Guilherme Giacomo Simoes <trintaeoitogc@...il.com>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] iwlwifi: mvm: adding check if the thermal firmware is running

In the dmesg is showing the message "failed to read out thermal zone"
as if the temperature read is failed by don't find the thermal zone.

After researching and debugging, I see that this specific error is
occurrenced because the thermal try read the temperature when is started,
but the firmware is not running yet.

For more legibiliti i change the tt.c for return EAGAIN when this was occurrence.
After this change, in my computer I compile and install kernel in /boot
and in my dmesg the message "failed to read out thermal zone" is not show
any more.

I would like to thanks for Rafael Wysocki <refael.j.wysocki@...el.com> and
Kalle Valo <kvalo@...nel.org> for your suggestions in my first patch.

Signed-off-by: Guilherme Giacomo Simoes <trintaeoitogc@...il.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/tt.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tt.c b/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
index 8083c4b2ab6b..68ab9966330c 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tt.c
@@ -620,8 +620,14 @@ static int iwl_mvm_tzone_get_temp(struct thermal_zone_device *device,

 	mutex_lock(&mvm->mutex);

-	if (!iwl_mvm_firmware_running(mvm) ||
-	    mvm->fwrt.cur_fw_img != IWL_UCODE_REGULAR) {
+	const int res = iwl_mvm_firmware_running(mvm);
+
+	if (!res) {
+		ret = -EAGAIN;
+		goto out;
+	}
+
+	if (mvm->fwrt.cur_fw_img != IWL_UCODE_REGULAR) {
 		ret = -ENODATA;
 		goto out;
 	}
-- 
2.45.1