From 8fddddff0ad4ccc2787464207eba9ed3063e69cd Mon Sep 17 00:00:00 2001
From: Daniel Halperin <dhalperi@cs.washington.edu>
Date: Tue, 10 May 2011 19:00:45 -0700
Subject: [PATCH] mac80211: fix contention time computation in minstrel,
 minstrel_ht

When transmitting a frame, the transmitter waits a random number of
slots between 0 and cw. Thus, the contention time is (cw / 2) * t_slot
which we can represent instead as (cw * t_slot) >> 1. Also fix a few
other accounting bugs around contention time, and add comments.

Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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