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signal strength in nl80211 and IEEE80211_HW_SIGNAL_UNSPEC

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I don't have a device using a driver with IEEE80211_HW_SIGNAL_UNSPEC
to test, but because of
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=19deffbeba930030cfaf000b920333c6ba99ad52
I guess nl80211 will report the NL80211_STA_INFO_SIGNAL even if the
driver doesn't uses dBm, true?
Looking at http://permalink.gmane.org/gmane.linux.kernel.wireless.general/24814
it seems this wasn't wanted. Bug, the check for
IEEE80211_HW_SIGNAL_DBM is done elsewhere or finally it was decided
that the signal strength should be reported even if the units are
unknown?

Thanks.

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