Commit 8eca1fb6 authored by Rostislav Lisovy's avatar Rostislav Lisovy Committed by Johannes Berg
Browse files

cfg80211: Use 5MHz bandwidth by default when checking usable channels 



Current code checks if the 20MHz bandwidth is allowed for
particular channel -- if it is not, the channel is disabled.
Since we need to use 5/10 MHz channels, this code is modified in
the way that the default bandwidth to check is 5MHz. If the
maximum bandwidth allowed by the channel is smaller than 5MHz,
the channel is disabled. Otherwise the channel is used and the
flags are set according to the bandwidth allowed by the channel.

Signed-off-by: default avatarRostislav Lisovy <rostislav.lisovy@fel.cvut.cz>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent ea077c1c

net/wireless/reg.c

+15 −7
Original line number Diff line number Diff line
@@ -935,7 +935,7 @@ freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq, 
		if (!band_rule_found)

			band_rule_found = freq_in_rule_band(fr, center_freq);



		bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));

		bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(5));



		if (band_rule_found && bw_fits)

			return rr;
@@ -1019,10 +1019,10 @@ static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain *regd, 
}

#endif



/*

 * Note that right now we assume the desired channel bandwidth

 * is always 20 MHz for each individual channel (HT40 uses 20 MHz

 * per channel, the primary and the extension channel).

/* Find an ieee80211_reg_rule such that a 5MHz channel with frequency

 * chan->center_freq fits there.

 * If there is no such reg_rule, disable the channel, otherwise set the

 * flags corresponding to the bandwidths allowed in the particular reg_rule

 */

static void handle_channel(struct wiphy *wiphy,

			   enum nl80211_reg_initiator initiator,
@@ -1083,8 +1083,12 @@ static void handle_channel(struct wiphy *wiphy, 
	if (reg_rule->flags & NL80211_RRF_AUTO_BW)

		max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);



	if (max_bandwidth_khz < MHZ_TO_KHZ(10))

		bw_flags = IEEE80211_CHAN_NO_10MHZ;

	if (max_bandwidth_khz < MHZ_TO_KHZ(20))

		bw_flags |= IEEE80211_CHAN_NO_20MHZ;

	if (max_bandwidth_khz < MHZ_TO_KHZ(40))

		bw_flags = IEEE80211_CHAN_NO_HT40;

		bw_flags |= IEEE80211_CHAN_NO_HT40;

	if (max_bandwidth_khz < MHZ_TO_KHZ(80))

		bw_flags |= IEEE80211_CHAN_NO_80MHZ;

	if (max_bandwidth_khz < MHZ_TO_KHZ(160))
@@ -1518,8 +1522,12 @@ static void handle_channel_custom(struct wiphy *wiphy, 
	if (reg_rule->flags & NL80211_RRF_AUTO_BW)

		max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);



	if (max_bandwidth_khz < MHZ_TO_KHZ(10))

		bw_flags = IEEE80211_CHAN_NO_10MHZ;

	if (max_bandwidth_khz < MHZ_TO_KHZ(20))

		bw_flags |= IEEE80211_CHAN_NO_20MHZ;

	if (max_bandwidth_khz < MHZ_TO_KHZ(40))

		bw_flags = IEEE80211_CHAN_NO_HT40;

		bw_flags |= IEEE80211_CHAN_NO_HT40;

	if (max_bandwidth_khz < MHZ_TO_KHZ(80))

		bw_flags |= IEEE80211_CHAN_NO_80MHZ;

	if (max_bandwidth_khz < MHZ_TO_KHZ(160))

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