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From:   Wen Gong <wgong@codeaurora.org>
To:     ath10k@lists.infradead.org
Cc:     linux-wireless@vger.kernel.org
Subject: [PATCH v4 1/2] ath10k: add refcount for ath10k_core_restart
Date:   Wed,  8 Jan 2020 11:19:56 +0800
Message-Id: <20200108031957.22308-2-wgong@codeaurora.org>
In-Reply-To: <20200108031957.22308-1-wgong@codeaurora.org>
References: <20200108031957.22308-1-wgong@codeaurora.org>
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When it has more than one restart_work queued meanwhile, the 2nd
restart_work is very esay to break the 1st restart work and lead
recovery fail.

Add a ref count to allow only one restart work running untill
device successfully recovered.

Tested with QCA6174 SDIO with firmware WLAN.RMH.4.4.1-00029.

Signed-off-by: Wen Gong <wgong@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/core.c | 13 +++++++++++++
 drivers/net/wireless/ath/ath10k/core.h |  2 ++
 drivers/net/wireless/ath/ath10k/mac.c  |  1 +
 3 files changed, 16 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index 91f131b87efc..0e31846e6c89 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -2199,6 +2199,14 @@ static void ath10k_core_restart(struct work_struct *work)
 {
 	struct ath10k *ar = container_of(work, struct ath10k, restart_work);
 	int ret;
+	int restart_count;
+
+	restart_count = atomic_add_return(1, &ar->restart_count);
+	if (restart_count > 1) {
+		ath10k_warn(ar, "can not restart, count: %d\n", restart_count);
+		atomic_dec(&ar->restart_count);
+		return;
+	}
 
 	set_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags);
 
@@ -2231,6 +2239,11 @@ static void ath10k_core_restart(struct work_struct *work)
 
 	mutex_lock(&ar->conf_mutex);
 
+	if (ar->state != ATH10K_STATE_ON) {
+		ath10k_warn(ar, "state is not on: %d\n", ar->state);
+		atomic_dec(&ar->restart_count);
+	}
+
 	switch (ar->state) {
 	case ATH10K_STATE_ON:
 		ar->state = ATH10K_STATE_RESTARTING;
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index e57b2e7235e3..810c99f2dc0e 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -982,6 +982,8 @@ struct ath10k {
 	/* protected by conf_mutex */
 	u8 ps_state_enable;
 
+	atomic_t restart_count;
+
 	bool nlo_enabled;
 	bool p2p;
 
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 3856edba7915..bc1574145e66 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -7208,6 +7208,7 @@ static void ath10k_reconfig_complete(struct ieee80211_hw *hw,
 		ath10k_info(ar, "device successfully recovered\n");
 		ar->state = ATH10K_STATE_ON;
 		ieee80211_wake_queues(ar->hw);
+		atomic_dec(&ar->restart_count);
 	}
 
 	mutex_unlock(&ar->conf_mutex);
-- 
2.23.0