From: Shuah Khan Date: Sat, 27 Feb 2021 00:07:00 +0000 (-0700) Subject: ath10k: Detect conf_mutex held ath10k_drain_tx() calls X-Git-Tag: accepted/tizen/unified/20230118.172025~7362^2~34 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bdb1050ee1faaec1e78c15de8b1959176f26c655;p=platform%2Fkernel%2Flinux-rpi.git 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 call to lockdep_assert_not_held() on conf_mutex to detect if conf_mutex is held by the caller. The idea for this patch stemmed from coming across the comment block above the ath10k_drain_tx() while reviewing the conf_mutex holds during to debug the conf_mutex lock assert in ath10k_debug_fw_stats_request(). Adding detection to assert on conf_mutex hold will help detect incorrect usages that could lead to locking problems when async worker routines try to call this routine. Signed-off-by: Shuah Khan Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Acked-by: Kalle Valo Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ --- diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index bb6c5ee..5ce4f8d 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -4727,6 +4727,8 @@ out: /* Must not be called with conf_mutex held as workers can use that also. */ void ath10k_drain_tx(struct ath10k *ar) { + lockdep_assert_not_held(&ar->conf_mutex); + /* make sure rcu-protected mac80211 tx path itself is drained */ synchronize_net();