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From: Ben Greear <greearb@candelatech.com>
To: Mohammed Shafi Shajakhan <mohammed@codeaurora.org>
Cc: linux-wireless@vger.kernel.org, ath10k@lists.infradead.org
Subject: Re: [PATCH v2 3/5] ath10k: Add WARN_ON if we over-write peer-map pointer.
Date: Tue, 10 May 2016 07:41:44 -0700	[thread overview]
Message-ID: <5731F328.30803@candelatech.com> (raw)
In-Reply-To: <20160510071214.GD25626@atheros-ThinkPad-T61>



On 05/10/2016 12:12 AM, Mohammed Shafi Shajakhan wrote:
> Hi Ben,
>
> On Fri, Apr 01, 2016 at 02:12:10PM -0700, greearb@candelatech.com wrote:
>> From: Ben Greear <greearb@candelatech.com>
>>
>> Not sure this can happen, but seems like a reasonable sanity
>> check.
>
> [shafi] possibly if the peer is removed and the bit is not cleared in the driver
> ? when the new peer occupies the slot

A firmware bug could cause this, but I never saw this WARN hit.  Still seems like
a good sanity check to me, though...it would be quite hard to debug this sort of bug
if it actually did happen.

Thanks,
Ben

>
>>
>> Signed-off-by: Ben Greear <greearb@candelatech.com>
>> ---
>>   drivers/net/wireless/ath/ath10k/txrx.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
>> index a779a4e..2edef8a 100644
>> --- a/drivers/net/wireless/ath/ath10k/txrx.c
>> +++ b/drivers/net/wireless/ath/ath10k/txrx.c
>> @@ -309,6 +309,7 @@ void ath10k_peer_map_event(struct ath10k_htt *htt,
>>   	ath10k_warn(ar, /*ATH10K_DBG_HTT,*/ "htt peer map vdev %d peer %pM id %d\n",
>>   		   ev->vdev_id, ev->addr, ev->peer_id);
>>
>> +	WARN_ON(ar->peer_map[ev->peer_id] && (ar->peer_map[ev->peer_id] != peer));
>>   	ar->peer_map[ev->peer_id] = peer;
>>   	set_bit(ev->peer_id, peer->peer_ids);
>>   exit:
>> --
>> 2.4.3
>
> regards,
> shafi
>
>>
>>
>> _______________________________________________
>> ath10k mailing list
>> ath10k@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/ath10k
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
>

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

WARNING: multiple messages have this Message-ID (diff)
From: Ben Greear <greearb@candelatech.com>
To: Mohammed Shafi Shajakhan <mohammed@codeaurora.org>
Cc: linux-wireless@vger.kernel.org, ath10k@lists.infradead.org
Subject: Re: [PATCH v2 3/5] ath10k: Add WARN_ON if we over-write peer-map pointer.
Date: Tue, 10 May 2016 07:41:44 -0700	[thread overview]
Message-ID: <5731F328.30803@candelatech.com> (raw)
In-Reply-To: <20160510071214.GD25626@atheros-ThinkPad-T61>



On 05/10/2016 12:12 AM, Mohammed Shafi Shajakhan wrote:
> Hi Ben,
>
> On Fri, Apr 01, 2016 at 02:12:10PM -0700, greearb@candelatech.com wrote:
>> From: Ben Greear <greearb@candelatech.com>
>>
>> Not sure this can happen, but seems like a reasonable sanity
>> check.
>
> [shafi] possibly if the peer is removed and the bit is not cleared in the driver
> ? when the new peer occupies the slot

A firmware bug could cause this, but I never saw this WARN hit.  Still seems like
a good sanity check to me, though...it would be quite hard to debug this sort of bug
if it actually did happen.

Thanks,
Ben

>
>>
>> Signed-off-by: Ben Greear <greearb@candelatech.com>
>> ---
>>   drivers/net/wireless/ath/ath10k/txrx.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
>> index a779a4e..2edef8a 100644
>> --- a/drivers/net/wireless/ath/ath10k/txrx.c
>> +++ b/drivers/net/wireless/ath/ath10k/txrx.c
>> @@ -309,6 +309,7 @@ void ath10k_peer_map_event(struct ath10k_htt *htt,
>>   	ath10k_warn(ar, /*ATH10K_DBG_HTT,*/ "htt peer map vdev %d peer %pM id %d\n",
>>   		   ev->vdev_id, ev->addr, ev->peer_id);
>>
>> +	WARN_ON(ar->peer_map[ev->peer_id] && (ar->peer_map[ev->peer_id] != peer));
>>   	ar->peer_map[ev->peer_id] = peer;
>>   	set_bit(ev->peer_id, peer->peer_ids);
>>   exit:
>> --
>> 2.4.3
>
> regards,
> shafi
>
>>
>>
>> _______________________________________________
>> ath10k mailing list
>> ath10k@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/ath10k
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
>

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

  reply	other threads:[~2016-05-10 14:42 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-01 21:12 [PATCH v2 1/5] ath10k: Ensure txrx-compl-task is stopped when cleaning htt-tx greearb
2016-04-01 21:12 ` greearb
2016-04-01 21:12 ` [PATCH v2 2/5] ath10k: Ensure peer_map references are cleaned up greearb
2016-04-01 21:12   ` greearb
2016-04-01 21:12 ` [PATCH v2 3/5] ath10k: Add WARN_ON if we over-write peer-map pointer greearb
2016-04-01 21:12   ` greearb
2016-05-10  7:12   ` Mohammed Shafi Shajakhan
2016-05-10  7:12     ` Mohammed Shafi Shajakhan
2016-05-10 14:41     ` Ben Greear [this message]
2016-05-10 14:41       ` Ben Greear
2016-05-10 16:38       ` Mohammed Shafi Shajakhan
2016-05-10 16:38         ` Mohammed Shafi Shajakhan
2016-07-08  6:48   ` [v2,3/5] " Kalle Valo
2016-07-08  6:48     ` Kalle Valo
2016-04-01 21:12 ` [PATCH v2 4/5] ath10k: Clean up peer when sta goes away greearb
2016-04-01 21:12   ` greearb
2016-04-01 21:12 ` [PATCH v2 5/5] ath10k: Fix deadlock when peer cannot be created greearb
2016-04-01 21:12   ` greearb
2016-05-09 17:19   ` Ben Greear
2016-05-09 17:19     ` Ben Greear
2016-05-09 17:54     ` Manoharan, Rajkumar
2016-05-09 17:54       ` Manoharan, Rajkumar
2016-05-09 17:58       ` Ben Greear
2016-05-09 17:58         ` Ben Greear
2016-05-13 14:07     ` Valo, Kalle
2016-05-13 14:07       ` Valo, Kalle
2016-06-06 17:24   ` [v2,5/5] " Kalle Valo
2016-06-06 17:24     ` Kalle Valo
2016-05-10  6:48 ` [PATCH v2 1/5] ath10k: Ensure txrx-compl-task is stopped when cleaning htt-tx Mohammed Shafi Shajakhan
2016-05-10  6:48   ` Mohammed Shafi Shajakhan
2016-05-10 14:39   ` Ben Greear
2016-05-10 14:39     ` Ben Greear
2016-05-10 16:36     ` Mohammed Shafi Shajakhan
2016-05-10 16:36       ` Mohammed Shafi Shajakhan
2016-07-08  6:43 ` [v2, " Kalle Valo
2016-07-08  6:43   ` Kalle Valo

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