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Re: [PATCH] mac80211: SMPS: Fix the overwrite of rx_chains in the interface loop.

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> On Sun, Jan 5, 2014 at 9:21 AM, Krishna Chaitanya
> <chaitanya.mgit@xxxxxxxxx> wrote:
>> On Sun, Jan 5, 2014 at 12:12 PM, Emmanuel Grumbach <egrumbach@xxxxxxxxx> wrote:
>>>
>>> On Sat, Jan 4, 2014 at 11:24 PM, Chaitanya T K <chaitanya.mgit@xxxxxxxxx> wrote:
>>> > The interface loop identifies the no of static and dynamic
>>> > smps chains, but overwrites their values across the VIF's
>>> > (assuming there are more than one, in my case its AP and STA
>>> > loopback), so the driver might not intimated about this update
>>> > of SMPS mode, is the value is same.
>>> >
>>> > So inform driver for every VIF.
>>> >
>>> > For Ex: STA's SMPS state is changed, but in the loop AP appears
>>> > at the last, SMPS state of AP is unchanged hence not intimated
>>> > to the driver.
>>> >
>>> > Signed-off-by: Chaitanya T K <chaitanya.mgit@xxxxxxxxx>
>>> > ---
>>>
>>> But the dynamic / static chains number is a property of the channel
>>> context. If you have several vifs on the same channel context, the
>>> maximum number of dynamic / static chains will be assigned to the
>>> channel context. In short, I think that mac80211 already does the job
>>> of taking all the parameters into account and putting the right value
>>> into the channel context?
>>> I don't really see what bug you are trying to solve - could you please
>>> tell us exactly what is your configuration?
>>> What SMPS do you have for each interface and what dynamic / static
>>> chains settings does mac80211 end up with?
>>
>> Agree this looks good in channel context angle.
>>
>> Lets say we have two VIF's one AP and one STA and the driver doesn't
>> support channel context's so in that case the config will happen
>> through hw_config but the problem is hw_config is out side the loop
>> so the config will happen with the parameters of the last VIF, which
>> is incorrect.
>
> Same applies if the driver doesn't support channel contexts. hw_config
> will be called with the correct local->smps_mode based on the number
> of channels required by each one of the vifs?

s/channels/chains/

> I don't see why only the last vif will be taken into account: the loop
> computes the maximum number of antenna requires by *all* the vifs.
> What am I missing here?
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