Re: Bisected 3.9 regression for iwl4965 connection problem to 1672c0e3

Johannes Berg
2013-05-06T15:44:16Z

On Mon, 2013-05-06 at 17:31 +0200, Johannes Berg wrote:

> > But if so, I would also see
> > the breakage on my setup, but I don't - it works quite well here.
>
> Are you testing on a passive channel? Try with a large beacon interval.

I think most likely what happens is that it's on a passive channel, and
the firmware drops the TX packet with a bad status. Before the patch,
we'd just wait sitting on the channel for HZ/5 (200ms) before trying
again, with the patch we immediately retransmit the packet, which will
fail again and again until the firmware received a beacon.

If you look at iwlwifi/dvm/, it has some passive_no_rx workaround for
this, which I don't see in iwlegacy.

I think the best way to solve this would be to do such a thing in
iwlegacy as well, but until then and for stable maybe we should
introduce another HW flag to restore the previous mac80211 behaviour?

johannes