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Re: [PATCH v2] mac80211: Fix a race on enabling power save.

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On Wed, Feb 16, 2011 at 4:41 PM, Johannes Berg
<johannes@xxxxxxxxxxxxxxxx> wrote:
> On Wed, 2011-02-16 at 15:01 +0530, Vivek Natarajan wrote:
>
>> >> And this is how I understand this:
>> >> stop queues, then send nullfunc, then do a flush to get the status and
>> >> wake queues again irrespective of acked or not(but set the ACK_STATUS
>> >> correspondingly). If tx() routine of nullfunc fails, then also wake
>> >> the queues.
>> >
>> > Yes, but since the flush is there, the latter (tx fails, ...) won't be
>> > needed.
>>
>> If queues are stopped before sending nullfunc, it is added in the
>> pending frames queue and the flush after nullfunc is ineffective. So,
>> is it okay to bypass this queue_stop check with REASON_PS if it is a
>> nullfunc frame? Any more ideas will be helpful.
>
> Ah, but I wasn't thinking of stopping the device queues, just the sdata
> queues, and the nullfunc doesn't go across those.

Thanks. It works. I will test it for some more time and send in the patch.

Vivek.
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