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cfg80211: Fix parsed country IE info for 5 GHz

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The country IE number of channels on 5 GHz specifies the number
of 5 GHz channels, not the number of sequential channel numbers.
For example, if in a country IEs if the first channel given is 36
and the number of channels passed is 4 then the individual channel
numbers defined for the 5 GHz PHY by these parameters

are: 36, 40, 44, 48
not: 36, 37, 38, 39

See: http://tinyurl.com/11d-clarification

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-01-07 17:43:37 -08:00 committed by John W. Linville
parent 0c7dc45d21
commit 02e68a3da0
1 changed files with 19 additions and 2 deletions
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21
net/wireless/reg.c
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@ -563,6 +563,7 @@ static struct ieee80211_regdomain *country_ie_2_rd(
/* This time around we fill in the rd */
while (country_ie_len >= 3) {
int end_channel = 0;
struct ieee80211_country_ie_triplet *triplet =
(struct ieee80211_country_ie_triplet *) country_ie;
struct ieee80211_reg_rule *reg_rule = NULL;
@ -584,6 +585,23 @@ static struct ieee80211_regdomain *country_ie_2_rd(
reg_rule->flags = flags;
/* 2 GHz */
if (triplet->chans.first_channel <= 14)
end_channel = triplet->chans.first_channel +
triplet->chans.num_channels;
else
/*
* 5 GHz -- For example in country IEs if the first
* channel given is 36 and the number of channels is 4
* then the individual channel numbers defined for the
* 5 GHz PHY by these parameters are: 36, 40, 44, and 48
* and not 36, 37, 38, 39.
*
* See: http://tinyurl.com/11d-clarification
*/
end_channel = triplet->chans.first_channel +
(4 * (triplet->chans.num_channels - 1));
/* The +10 is since the regulatory domain expects
* the actual band edge, not the center of freq for
* its start and end freqs, assuming 20 MHz bandwidth on
@ -593,8 +611,7 @@ static struct ieee80211_regdomain *country_ie_2_rd(
triplet->chans.first_channel) - 10);
freq_range->end_freq_khz =
MHZ_TO_KHZ(ieee80211_channel_to_frequency(
triplet->chans.first_channel +
triplet->chans.num_channels) + 10);
end_channel) + 10);
/* Large arbitrary values, we intersect later */
/* Increment this if we ever support >= 40 MHz channels