mac80211: minstrel: remove divisions in tx status path
Use a slightly different threshold for downgrading spatial streams to make it easier to calculate without divisions. Slightly reduces CPU overhead. Signed-off-by: NFelix Fietkau <nbd@nbd.name> Link: https://lore.kernel.org/r/20191008171139.96476-1-nbd@nbd.nameSigned-off-by: NJohannes Berg <johannes.berg@intel.com>
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