From: Johannes Berg <johannes.berg@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
---
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 6a54caa6fa16..5a0c4fd2ec5a 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -905,6 +905,17 @@ 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 285b8076054b..0c349c7819dc 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -6,7 +6,7 @@
*
* Copyright 2009 Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
* Copyright 2013-2014 Intel Mobile Communications GmbH
- * Copyright 2018-2020 Intel Corporation
+ * Copyright 2018-2021 Intel Corporation
*/
#include <linux/export.h>
@@ -1335,3 +1335,34 @@ 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);
--
2.32.0
