linux-kernel - [PATCH 4/5] ath10k: detect conf_mutex held ath10k_drain

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Message-Id: <a980abfb143f5240375f3f1046f0f26971c695e6.1612915444.git.skhan@linuxfoundation.org>
Date:   Tue,  9 Feb 2021 17:42:25 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org
Cc:     Shuah Khan <skhan@...uxfoundation.org>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] ath10k: detect conf_mutex held ath10k_drain_tx() calls

ath10k_drain_tx() must not be called with conf_mutex held as workers can
use that also. Add check to detect conf_mutex held calls.

Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
---
 drivers/net/wireless/ath/ath10k/mac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 53f92945006f..3545ce7dce0a 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -4566,6 +4566,7 @@ static void ath10k_mac_op_wake_tx_queue(struct ieee80211_hw *hw,
 /* Must not be called with conf_mutex held as workers can use that also. */
 void ath10k_drain_tx(struct ath10k *ar)
 {
+	WARN_ON(lockdep_is_held(&ar->conf_mutex));
 	/* make sure rcu-protected mac80211 tx path itself is drained */
 	synchronize_net();
 
-- 
2.27.0