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Some drivers (ath10k) report MCS 9 @ 20MHz, which technically isn't defined. To get more meaningful value than 0 out of this however, just extrapolate a bitrate from ratio of MCS 7 and 9 in channels where it is allowed. Signed-off-by: Thomas Pedersen <twp@qca.qualcomm.com> [add a comment about it in the code] Signed-off-by: Johannes Berg <johannes.berg@intel.com>