[PATCH AUTOSEL 5.4 068/107] wireless: fix enabling channel 12 for custom regulatory domain
From: Sasha Levin <sashal@kernel.org>
Date: 2020-01-24 14:35:20
Also in:
linux-wireless, lkml, stable
Subsystem:
802.11 (including cfg80211/nl80211), the rest · Maintainers:
Johannes Berg, Linus Torvalds
From: Ganapathi Bhat <redacted>
[ Upstream commit c4b9d655e445a8be0bff624aedea190606b5ebbc ]
Commit e33e2241e272 ("Revert "cfg80211: Use 5MHz bandwidth by
default when checking usable channels"") fixed a broken
regulatory (leaving channel 12 open for AP where not permitted).
Apply a similar fix to custom regulatory domain processing.
Signed-off-by: Cathy Luo <redacted>
Signed-off-by: Ganapathi Bhat <redacted>
Link: https://lore.kernel.org/r/1576836859-8945-1-git-send-email-ganapathi.bhat@nxp.com (local)
[reword commit message, fix coding style, add a comment]
Signed-off-by: Johannes Berg <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/wireless/reg.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 446c76d44e65a..3c2070040277d 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c@@ -2261,14 +2261,15 @@ static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) static void handle_channel_custom(struct wiphy *wiphy, struct ieee80211_channel *chan, - const struct ieee80211_regdomain *regd) + const struct ieee80211_regdomain *regd, + u32 min_bw) { u32 bw_flags = 0; const struct ieee80211_reg_rule *reg_rule = NULL; const struct ieee80211_power_rule *power_rule = NULL; u32 bw; - for (bw = MHZ_TO_KHZ(20); bw >= MHZ_TO_KHZ(5); bw = bw / 2) { + for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) { reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq), regd, bw); if (!IS_ERR(reg_rule))
@@ -2324,8 +2325,14 @@ static void handle_band_custom(struct wiphy *wiphy, if (!sband) return; + /* + * We currently assume that you always want at least 20 MHz, + * otherwise channel 12 might get enabled if this rule is + * compatible to US, which permits 2402 - 2472 MHz. + */ for (i = 0; i < sband->n_channels; i++) - handle_channel_custom(wiphy, &sband->channels[i], regd); + handle_channel_custom(wiphy, &sband->channels[i], regd, + MHZ_TO_KHZ(20)); } /* Used by drivers prior to wiphy registration */
--
2.20.1