From be989891e4f2ff5649bf22ab05a7cdd3a287e34b Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 18 Jun 2021 13:41:39 +0300 Subject: [PATCH] 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 Signed-off-by: Luca Coelho Link: https://lore.kernel.org/r/iwlwifi.20210618133832.2b613addaa85.Idaf8b859089490537878a7de5c7453a873a3f638@changeid Signed-off-by: Johannes Berg --- include/net/cfg80211.h | 11 +++++++++++ net/wireless/chan.c | 33 ++++++++++++++++++++++++++++++++- 2 files changed, 43 insertions(+), 1 deletion(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 7b4ef45d49b0..481e4e24800f 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -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 * diff --git a/net/wireless/chan.c b/net/wireless/chan.c index 472c895823a4..869c43d4414c 100644 --- a/net/wireless/chan.c +++ b/net/wireless/chan.c @@ -6,7 +6,7 @@ * * Copyright 2009 Johannes Berg * Copyright 2013-2014 Intel Mobile Communications GmbH - * Copyright 2018-2020 Intel Corporation + * Copyright 2018-2021 Intel Corporation */ #include @@ -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); -- 2.25.1