linux-kernel - [PATCH ath-next 1/2] wifi: ath12k: initialize eirp

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Message-Id: <20250804-ath12k-fix-smatch-warning-on-6g-vlp-v1-1-56f1e54152ab@oss.qualcomm.com>
Date: Mon, 04 Aug 2025 11:03:10 +0800
From: Baochen Qiang <baochen.qiang@....qualcomm.com>
To: Jeff Johnson <jjohnson@...nel.org>,
        Baochen Qiang <quic_bqiang@...cinc.com>,
        Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@....qualcomm.com>
Cc: Jeff Johnson <jeff.johnson@....qualcomm.com>,
        linux-wireless@...r.kernel.org, ath12k@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Baochen Qiang <baochen.qiang@....qualcomm.com>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH ath-next 1/2] wifi: ath12k: initialize eirp_power before
 use

Currently, at the end of ath12k_mac_fill_reg_tpc_info(), the
reg_tpc_info struct is populated, including the following:
reg_tpc_info->is_psd_power = is_psd_power;
reg_tpc_info->eirp_power = eirp_power;

Kernel test robot complains on uninitialized symbol:
drivers/net/wireless/ath/ath12k/mac.c:10069
ath12k_mac_fill_reg_tpc_info() error: uninitialized symbol 'eirp_power'

This is because there are some code paths that never set eirp_power, so
the assignment of reg_tpc_info->eirp_power can come from an
uninitialized variable. Functionally this is OK since the eirp_power
only has meaning when is_psd_power is true, and all code paths which set
is_psd_power to true also set eirp_power. However, to keep the robot
happy, always initialize eirp_power before use.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00284-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1

Fixes: aeda163bb0c7 ("wifi: ath12k: fill parameters for vdev set TPC power WMI command")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202505180927.tbNWr3vE-lkp@intel.com/
Signed-off-by: Baochen Qiang <baochen.qiang@....qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index bd1ec3b2c084169b841146931c54b6106f7006f6..8295480e8b1eeaa3e69cca823e6745733ade50e0 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -11228,8 +11228,8 @@ void ath12k_mac_fill_reg_tpc_info(struct ath12k *ar,
 	struct ieee80211_channel *chan, *temp_chan;
 	u8 pwr_lvl_idx, num_pwr_levels, pwr_reduction;
 	bool is_psd_power = false, is_tpe_present = false;
-	s8 max_tx_power[ATH12K_NUM_PWR_LEVELS],
-		psd_power, tx_power, eirp_power;
+	s8 max_tx_power[ATH12K_NUM_PWR_LEVELS], psd_power, tx_power;
+	s8 eirp_power = 0;
 	struct ath12k_vif *ahvif = arvif->ahvif;
 	u16 start_freq, center_freq;
 	u8 reg_6ghz_power_mode;

-- 
2.25.1