Commit be989891 authored by Johannes Berg's avatar Johannes Berg
Browse files

cfg80211: add cfg80211_any_usable_channels() 



This helper function checks if there are any usable channels on
any of the given bands with the given properties (as expressed
by disallowed channel flags).

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarLuca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210618133832.2b613addaa85.Idaf8b859089490537878a7de5c7453a873a3f638@changeid


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent b767ecda

include/net/cfg80211.h

+11 −0
Original line number Diff line number Diff line
@@ -894,6 +894,17 @@ ieee80211_chandef_max_power(struct cfg80211_chan_def *chandef) 
	return chandef->chan->max_power;

}



/**

 * cfg80211_any_usable_channels - check for usable channels

 * @wiphy: the wiphy to check for

 * @band_mask: which bands to check on

 * @prohibited_flags: which channels to not consider usable,

 *	%IEEE80211_CHAN_DISABLED is always taken into account

 */

bool cfg80211_any_usable_channels(struct wiphy *wiphy,

				  unsigned long band_mask,

				  u32 prohibited_flags);



/**

 * enum survey_info_flags - survey information flags

 *

net/wireless/chan.c

+32 −1
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ 
 *

 * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>

 * Copyright 2013-2014  Intel Mobile Communications GmbH

 * Copyright 2018-2020	Intel Corporation

 * Copyright 2018-2021	Intel Corporation

 */



#include <linux/export.h>
@@ -1339,3 +1339,34 @@ cfg80211_get_chan_state(struct wireless_dev *wdev, 
		WARN_ON(1);

	}

}



bool cfg80211_any_usable_channels(struct wiphy *wiphy,

				  unsigned long sband_mask,

				  u32 prohibited_flags)

{

	int idx;



	prohibited_flags |= IEEE80211_CHAN_DISABLED;



	for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) {

		struct ieee80211_supported_band *sband = wiphy->bands[idx];

		int chanidx;



		if (!sband)

			continue;



		for (chanidx = 0; chanidx < sband->n_channels; chanidx++) {

			struct ieee80211_channel *chan;



			chan = &sband->channels[chanidx];



			if (chan->flags & prohibited_flags)

				continue;



			return true;

		}

	}



	return false;

}

EXPORT_SYMBOL(cfg80211_any_usable_channels);