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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: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210618133832.2b613addaa85.Idaf8b859089490537878a7de5c7453a873a3f638@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2021-06-18 13:41:39 +03:00
parent b767ecdaf9
commit be989891e4
2 changed files with 43 additions and 1 deletions
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11
include/net/cfg80211.h
View File

@ -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
*

33
net/wireless/chan.c
View File

@ -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);