diff mbox

mac80211: fix channel selection bug

Message ID 1360577653-20260-1-git-send-email-johannes@sipsolutions.net (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Johannes Berg Feb. 11, 2013, 10:14 a.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

When trying to connect to an AP that advertises HT but not
VHT, the mac80211 code erroneously uses the configuration
from the AP as is instead of checking it against regulatory
and local capabilities. This can lead to using an invalid
or even inexistent channel (like 11/HT40+).

Additionally, the return flags from downgrading must be
ORed together, to collect them from all of the downgrades.
Also clarify the message.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/mac80211/mlme.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Johannes Berg Feb. 11, 2013, 10:59 a.m. UTC | #1 
On Mon, 2013-02-11 at 11:14 +0100, Johannes Berg wrote:
> From: Johannes Berg <johannes.berg@intel.com>
> 
> When trying to connect to an AP that advertises HT but not
> VHT, the mac80211 code erroneously uses the configuration
> from the AP as is instead of checking it against regulatory
> and local capabilities. This can lead to using an invalid
> or even inexistent channel (like 11/HT40+).
> 
> Additionally, the return flags from downgrading must be
> ORed together, to collect them from all of the downgrades.
> Also clarify the message.

Applied.

johannes

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diff mbox

Patch

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 3b9cb51..5107248 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3400,6 +3400,7 @@  ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 
 	ret = 0;
 
+out:
 	while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 					IEEE80211_CHAN_DISABLED)) {
 		if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
@@ -3408,14 +3409,13 @@  ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 			goto out;
 		}
 
-		ret = chandef_downgrade(chandef);
+		ret |= chandef_downgrade(chandef);
 	}
 
 	if (chandef->width != vht_chandef.width)
 		sdata_info(sdata,
-			   "local regulatory prevented using AP HT/VHT configuration, downgraded\n");
+			   "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 
-out:
 	WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 	return ret;
 }