From df13cce53a7b28a81460e6bfc4857e9df4956141 Mon Sep 17 00:00:00 2001
From: Helmut Schaa <Helmut.Schaa@gmx.de>
Date: Wed, 24 Feb 2010 14:19:21 +0100
Subject: [PATCH] mac80211: Improve software scan timing

The current software scan implemenation in mac80211 returns to the operating
channel after each scanned channel. However, in some situations (e.g. no
traffic) it would be nicer to scan a few channels in a row to speed up
the scan itself.

Hence, after scanning a channel, check if we have queued up any tx frames and
return to the operating channel in that case.

Unfortunately we don't know if the AP has buffered any frames for us. Hence,
scan only as many channels in a row as the pm_qos latency and the negotiated
listen interval allows us to.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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