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From:   Aditya Kumar Singh <quic_adisi@quicinc.com>
To:     <ath11k@lists.infradead.org>
CC:     <linux-wireless@vger.kernel.org>,
        P Praneesh <quic_ppranees@quicinc.com>,
        Aditya Kumar Singh <quic_adisi@quicinc.com>
Subject: [PATCH] wifi: ath11k: fix memory leak in WMI firmware stats
Date:   Tue, 6 Jun 2023 14:41:28 +0530
Message-ID: <20230606091128.14202-1-quic_adisi@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

From: P Praneesh <quic_ppranees@quicinc.com>

Memory allocated for firmware pdev, vdev and beacon statistics
are not released during rmmod.

Fix it by calling ath11k_fw_stats_free() function before hardware
unregister.

While at it, avoid calling ath11k_fw_stats_free() while processing
the firmware stats received in the WMI event because the local list
is getting spliced and reinitialised and hence there are no elements
in the list after splicing.

Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1

Signed-off-by: P Praneesh <quic_ppranees@quicinc.com>
Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
---
 drivers/net/wireless/ath/ath11k/mac.c | 1 +
 drivers/net/wireless/ath/ath11k/wmi.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index a31b8e89684b..2e462e7a8b4d 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -9792,6 +9792,7 @@ void ath11k_mac_destroy(struct ath11k_base *ab)
 		if (!ar)
 			continue;
 
+		ath11k_fw_stats_free(&ar->fw_stats);
 		ieee80211_free_hw(ar->hw);
 		pdev->ar = NULL;
 	}
diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c
index 68622a850527..8b457558b975 100644
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -8097,6 +8097,11 @@ static void ath11k_update_stats_event(struct ath11k_base *ab, struct sk_buff *sk
 	rcu_read_unlock();
 	spin_unlock_bh(&ar->data_lock);
 
+	/* Since the stats's pdev, vdev and beacon list are spliced and reinitialised
+	 * at this point, no need to free the individual list.
+	 */
+	return;
+
 free:
 	ath11k_fw_stats_free(&stats);
 }

base-commit: a4756ac34a7002861c9bdf8cf45aec53a77fb78d
-- 
2.17.1