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

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Date:	Mon, 06 Apr 2015 12:01:28 +0200
From:	Oleksij Rempel <linux@...pel-privat.de>
To:	Fred Chou <fred.chou.nd@...il.com>, 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
Subject: Re: [PATCH] ath9k_htc: check seq number instead of cmd id for timeout

Hi Kalle,

can you please apply this patch.

Am 06.04.2015 um 08:33 schrieb Fred Chou:
> Hi all,
> 
> May I have an update on the patch status please?
> 
> Thanks and regards,
> Fred
> 
> On 13/3/2015 4:32 PM, Fred Chou wrote:
>> 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;
>>
> --
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-- 
Regards,
Oleksij


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