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Re: [PATCH 00/18] mac80211 cleanups and fixes

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On Thu, 2008-09-11 at 13:59 +0530, Sujith wrote:

>  > I'd been talking with Sujith about this one:
>  > 
>  >  * mac80211: share STA information with driver
>  > 
>  > and decided to just do it; as it stands it's not very useful
>  > but I expect it to be used soon, if not we can remove the
>  > EXPORT_SYMBOL again.
>  > 
> 
> This would be very useful for ath9k. Making use of the
> private area for each STA can enable removal of the node list
> that is maintained currently.

I had actually tried
(http://johannes.sipsolutions.net/patches/kernel/ath9k-sta-node.patch)
but you're using refcounting for the nodes while mac80211 RCU-protects
them, so I didn't get very far. It needs a bit more effort to make sure
you don't have node pointers stick around in some tx descriptor after
mac80211 decides to remove a node (which may very well happen while
frames are queued)

johannes

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