linux-kernel - [PATCH] ath9k_htc: check seq number instead of cmd id for timeout

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Message-Id: <1426235558-13787-1-git-send-email-fred.chou.nd@gmail.com>
Date:	Fri, 13 Mar 2015 16:32:38 +0800
From:	Fred Chou <fred.chou.nd@...il.com>
To:	ath9k-devel@....qualcomm.com, kvalo@...eaurora.org
Cc:	linux-wireless@...r.kernel.org, ath9k-devel@...ts.ath9k.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Fred Chou <fred.chou.nd@...il.com>
Subject: [PATCH] ath9k_htc: check seq number instead of cmd id for timeout

From: Fred Chou <fred.chou.nd@...il.com>

As the driver may send multiple wmi commands with identical cmd id,
it is more robust to check seq number for timeout instead.

Signed-off-by: Fred Chou <fred.chou.nd@...il.com>
---
 drivers/net/wireless/ath/ath9k/wmi.c | 12 ++++++------
 drivers/net/wireless/ath/ath9k/wmi.h |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/wmi.c b/drivers/net/wireless/ath/ath9k/wmi.c
index 65c8894..aba909f 100644
--- a/drivers/net/wireless/ath/ath9k/wmi.c
+++ b/drivers/net/wireless/ath/ath9k/wmi.c
@@ -224,7 +224,7 @@ static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
 
 	/* Check if there has been a timeout. */
 	spin_lock(&wmi->wmi_lock);
-	if (cmd_id != wmi->last_cmd_id) {
+	if (be16_to_cpu(hdr->seq_no) != wmi->last_seq_id) {
 		spin_unlock(&wmi->wmi_lock);
 		goto free_skb;
 	}
@@ -272,11 +272,16 @@ static int ath9k_wmi_cmd_issue(struct wmi *wmi,
 			       enum wmi_cmd_id cmd, u16 len)
 {
 	struct wmi_cmd_hdr *hdr;
+	unsigned long flags;
 
 	hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
 	hdr->command_id = cpu_to_be16(cmd);
 	hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
 
+	spin_lock_irqsave(&wmi->wmi_lock, flags);
+	wmi->last_seq_id = wmi->tx_seq_id;
+	spin_unlock_irqrestore(&wmi->wmi_lock, flags);
+
 	return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);
 }
 
@@ -292,7 +297,6 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 	struct sk_buff *skb;
 	u8 *data;
 	int time_left, ret = 0;
-	unsigned long flags;
 
 	if (ah->ah_flags & AH_UNPLUGGED)
 		return 0;
@@ -320,10 +324,6 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 	wmi->cmd_rsp_buf = rsp_buf;
 	wmi->cmd_rsp_len = rsp_len;
 
-	spin_lock_irqsave(&wmi->wmi_lock, flags);
-	wmi->last_cmd_id = cmd_id;
-	spin_unlock_irqrestore(&wmi->wmi_lock, flags);
-
 	ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
 	if (ret)
 		goto out;
diff --git a/drivers/net/wireless/ath/ath9k/wmi.h b/drivers/net/wireless/ath/ath9k/wmi.h
index 0db37f2..2aad6dc 100644
--- a/drivers/net/wireless/ath/ath9k/wmi.h
+++ b/drivers/net/wireless/ath/ath9k/wmi.h
@@ -143,7 +143,7 @@ struct wmi {
 	enum htc_endpoint_id ctrl_epid;
 	struct mutex op_mutex;
 	struct completion cmd_wait;
-	enum wmi_cmd_id last_cmd_id;
+	u16 last_seq_id;
 	struct sk_buff_head wmi_event_queue;
 	struct tasklet_struct wmi_event_tasklet;
 	u16 tx_seq_id;
-- 
1.9.1

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