linux-kernel - Re: [ 104/173] rt2x00: Dont let mac80211 send a BAR when an AMPDU subframe fails

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Message-ID: <50DEA41E.6010409@01019freenet.de>
Date:	Sat, 29 Dec 2012 09:04:46 +0100
From:	Andreas Hartmann <andihartmann@...19freenet.de>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Andreas Hartmann <andihartmann@...19freenet.de>,
	Helmut Schaa <helmut.schaa@...glemail.com>,
	"John W. Linville" <linville@...driver.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Subject: Re: [ 104/173] rt2x00: Dont let mac80211 send a BAR when an AMPDU
 subframe fails

Ben Hutchings wrote:
> 3.2-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Andreas Hartmann <andihartmann@...19freenet.de>
> 
> commit be03d4a45c09ee5100d3aaaedd087f19bc20d01f upstream.

[...]

This patch is a workaround for

mac80211: retry sending failed BAR frames later instead of tearing down
aggr (http://www.spinics.net/lists/linux-wireless/msg76379.html -
f0425beda4d404a6e751439b562100b902ba9c98)
See:
http://thread.gmane.org/gmane.linux.kernel.wireless.general/83297/focus=83304


Meanwhile there was a bug report complaining about problems with
be03d4a45 when used as STA:
http://thread.gmane.org/gmane.linux.drivers.rt2x00.user/1257
You can find there a few other workaround proposals.


Stanislaw Gruszka proposed here a final(?) workaround, which refines
workaround be03d4a45c by shrinking it to AP function:
http://thread.gmane.org/gmane.linux.kernel.wireless.general/100793


carl9170 had the same problem with f0425beda. There it was fixed like
this:
http://thread.gmane.org/gmane.linux.kernel.wireless.general/100793/focus=1405
This approach fixes the real problem (no aggregation handling by the
firmware / hardware) by implementing it into the driver.

Unfortunately, I didn't see any implementation of c9122c0d63a50 for
rt2x00 until now.



Kind regards,
Andreas Hartmann
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