[PATCH 4/5] ath10k: detect conf_mutex held ath10k_drain_tx() calls

[Shuah Khan]

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 <sk...@linuxfoundation.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