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author | John W. Linville <linville@tuxdriver.com> | 2014-03-03 14:34:45 -0500 |
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committer | John W. Linville <linville@tuxdriver.com> | 2014-03-03 14:34:45 -0500 |
commit | 0c6a4812a0e1879daa6c8ac88e566dbb85e1ea70 (patch) | |
tree | acf4cfcd93c103db52086bd5397b64aa3b828c7a /net/mac80211 | |
parent | 635d61a3735e05c8da72740006670f819e5b6a5f (diff) | |
parent | adb07df1e039e9fe43e66aeea8b4771f83659dbb (diff) | |
download | linux-stable-0c6a4812a0e1879daa6c8ac88e566dbb85e1ea70.tar.gz linux-stable-0c6a4812a0e1879daa6c8ac88e566dbb85e1ea70.tar.bz2 linux-stable-0c6a4812a0e1879daa6c8ac88e566dbb85e1ea70.zip |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem
Diffstat (limited to 'net/mac80211')
-rw-r--r-- | net/mac80211/mlme.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 57d5482b10fa..245dce969b31 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -222,6 +222,7 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, switch (vht_oper->chan_width) { case IEEE80211_VHT_CHANWIDTH_USE_HT: vht_chandef.width = chandef->width; + vht_chandef.center_freq1 = chandef->center_freq1; break; case IEEE80211_VHT_CHANWIDTH_80MHZ: vht_chandef.width = NL80211_CHAN_WIDTH_80; @@ -271,6 +272,28 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, ret = 0; out: + /* + * When tracking the current AP, don't do any further checks if the + * new chandef is identical to the one we're currently using for the + * connection. This keeps us from playing ping-pong with regulatory, + * without it the following can happen (for example): + * - connect to an AP with 80 MHz, world regdom allows 80 MHz + * - AP advertises regdom US + * - CRDA loads regdom US with 80 MHz prohibited (old database) + * - the code below detects an unsupported channel, downgrades, and + * we disconnect from the AP in the caller + * - disconnect causes CRDA to reload world regdomain and the game + * starts anew. + * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881) + * + * It seems possible that there are still scenarios with CSA or real + * bandwidth changes where a this could happen, but those cases are + * less common and wouldn't completely prevent using the AP. + */ + if (tracking && + cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) + return ret; + /* don't print the message below for VHT mismatch if VHT is disabled */ if (ret & IEEE80211_STA_DISABLE_VHT) vht_chandef = *chandef; |