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Fix mac80211 connection issues (rhbz 981445)

This commit is contained in:
Josh Boyer 2013-08-01 08:49:55 -04:00
parent b1910f0058
commit ca72d3df4f
4 changed files with 207 additions and 0 deletions
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11
kernel.spec
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@ -785,6 +785,11 @@ Patch25072: HID-Revert-Revert-HID-Fix-logitech-dj-missing-Unifying-device-issue.
#rhbz 977053
Patch25073: iwl4965-reset-firmware-after-rfkill-off.patch
#rhbz 981445
Patch25074: mac80211-fix-infinite-loop-in-ieee80211_determine_chantype.patch
Patch25075: mac80211-ignore-HT-primary-channel-while-connected.patch
Patch25076: mac80211-continue-using-disabled-channels-while-connected.patch
# END OF PATCH DEFINITIONS
%endif
@ -1518,6 +1523,11 @@ ApplyPatch HID-Revert-Revert-HID-Fix-logitech-dj-missing-Unifying-device-issue.p
#rhbz 977053
ApplyPatch iwl4965-reset-firmware-after-rfkill-off.patch
#rhbz 981445
ApplyPatch mac80211-fix-infinite-loop-in-ieee80211_determine_chantype.patch
ApplyPatch mac80211-ignore-HT-primary-channel-while-connected.patch
ApplyPatch mac80211-continue-using-disabled-channels-while-connected.patch
# END OF PATCH APPLICATIONS
%endif
@ -2327,6 +2337,7 @@ fi
%changelog
* Thu Aug 01 2013 Josh Boyer <jwboyer@redhat.com>
- Fix mac80211 connection issues (rhbz 981445)
- Fix firmware issues with iwl4965 and rfkill (rhbz 977053)
- Drop hid-logitech-dj patch that was breaking enumeration (rhbz 989138)

43
mac80211-continue-using-disabled-channels-while-connected.patch Normal file
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@ -0,0 +1,43 @@
From ddfe49b42d8ad4bfdf92d63d4a74f162660d878d Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 31 Jul 2013 18:52:03 +0000
Subject: mac80211: continue using disabled channels while connected
In case the AP has different regulatory information than we do,
it can happen that we connect to an AP based on e.g. the world
roaming regulatory data, and then update our database with the
AP's country information disables the channel the AP is using.
If this happens on an HT AP, the bandwidth tracking code will
hit the WARN_ON() and disconnect. Since that's not very useful,
ignore the channel-disable flag in bandwidth tracking.
Cc: stable@vger.kernel.org
Reported-by: Chris Wright <chrisw@sous-sol.org>
Tested-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 077a953..cc9e02d 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -335,8 +335,17 @@ out:
if (ret & IEEE80211_STA_DISABLE_VHT)
vht_chandef = *chandef;
+ /*
+ * Ignore the DISABLED flag when we're already connected and only
+ * tracking the APs beacon for bandwidth changes - otherwise we
+ * might get disconnected here if we connect to an AP, update our
+ * regulatory information based on the AP's country IE and the
+ * information we have is wrong/outdated and disables the channel
+ * that we're actually using for the connection to the AP.
+ */
while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
- IEEE80211_CHAN_DISABLED)) {
+ tracking ? 0 :
+ IEEE80211_CHAN_DISABLED)) {
if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
ret = IEEE80211_STA_DISABLE_HT |
IEEE80211_STA_DISABLE_VHT;
--
cgit v0.9.2

32
mac80211-fix-infinite-loop-in-ieee80211_determine_chantype.patch Normal file
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@ -0,0 +1,32 @@
From b56e4b857c5210e848bfb80e074e5756a36cd523 Mon Sep 17 00:00:00 2001
From: Chris Wright <chrisw@sous-sol.org>
Date: Wed, 31 Jul 2013 19:12:24 +0000
Subject: mac80211: fix infinite loop in ieee80211_determine_chantype
Commit "3d9646d mac80211: fix channel selection bug" introduced a possible
infinite loop by moving the out target above the chandef_downgrade
while loop. When we downgrade to NL80211_CHAN_WIDTH_20_NOHT, we jump
back up to re-run the while loop...indefinitely. Replace goto with
break and carry on. This may not be sufficient to connect to the AP,
but will at least keep the cpu from livelocking. Thanks to Derek Atkins
as an extra pair of debugging eyes.
Cc: stable@kernel.org
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index ae31968..e3e7d2b 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -338,7 +338,7 @@ out:
if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
ret = IEEE80211_STA_DISABLE_HT |
IEEE80211_STA_DISABLE_VHT;
- goto out;
+ break;
}
ret |= chandef_downgrade(chandef);
--
cgit v0.9.2

121
mac80211-ignore-HT-primary-channel-while-connected.patch Normal file
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@ -0,0 +1,121 @@
From 5cdaed1e878d723d56d04ae0be1738124acf9f46 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 31 Jul 2013 09:23:06 +0000
Subject: mac80211: ignore HT primary channel while connected
While we're connected, the AP shouldn't change the primary channel
in the HT information. We checked this, and dropped the connection
if it did change it.
Unfortunately, this is causing problems on some APs, e.g. on the
Netgear WRT610NL: the beacons seem to always contain a bad channel
and if we made a connection using a probe response (correct data)
we drop the connection immediately and can basically not connect
properly at all.
Work around this by ignoring the HT primary channel information in
beacons if we're already connected.
Also print out more verbose messages in the other situations to
help diagnose similar bugs quicker in the future.
Cc: stable@vger.kernel.org [3.10]
Acked-by: Andy Isaacson <adi@hexapodia.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index e5c3cf4..077a953 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -211,8 +211,9 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *channel,
const struct ieee80211_ht_operation *ht_oper,
const struct ieee80211_vht_operation *vht_oper,
- struct cfg80211_chan_def *chandef, bool verbose)
+ struct cfg80211_chan_def *chandef, bool tracking)
{
+ struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct cfg80211_chan_def vht_chandef;
u32 ht_cfreq, ret;
@@ -231,7 +232,7 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
channel->band);
/* check that channel matches the right operating channel */
- if (channel->center_freq != ht_cfreq) {
+ if (!tracking && channel->center_freq != ht_cfreq) {
/*
* It's possible that some APs are confused here;
* Netgear WNDR3700 sometimes reports 4 higher than
@@ -239,11 +240,10 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
* since we look at probe response/beacon data here
* it should be OK.
*/
- if (verbose)
- sdata_info(sdata,
- "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
- channel->center_freq, ht_cfreq,
- ht_oper->primary_chan, channel->band);
+ sdata_info(sdata,
+ "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
+ channel->center_freq, ht_cfreq,
+ ht_oper->primary_chan, channel->band);
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
goto out;
}
@@ -297,7 +297,7 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
channel->band);
break;
default:
- if (verbose)
+ if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
sdata_info(sdata,
"AP VHT operation IE has invalid channel width (%d), disable VHT\n",
vht_oper->chan_width);
@@ -306,7 +306,7 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
}
if (!cfg80211_chandef_valid(&vht_chandef)) {
- if (verbose)
+ if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
sdata_info(sdata,
"AP VHT information is invalid, disable VHT\n");
ret = IEEE80211_STA_DISABLE_VHT;
@@ -319,7 +319,7 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
}
if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
- if (verbose)
+ if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
sdata_info(sdata,
"AP VHT information doesn't match HT, disable VHT\n");
ret = IEEE80211_STA_DISABLE_VHT;
@@ -346,7 +346,7 @@ out:
ret |= chandef_downgrade(chandef);
}
- if (chandef->width != vht_chandef.width && verbose)
+ if (chandef->width != vht_chandef.width && !tracking)
sdata_info(sdata,
"capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
@@ -386,7 +386,7 @@ static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
/* calculate new channel (type) based on HT/VHT operation IEs */
flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
- vht_oper, &chandef, false);
+ vht_oper, &chandef, true);
/*
* Downgrade the new channel if we associated with restricted
@@ -3838,7 +3838,7 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
cbss->channel,
ht_oper, vht_oper,
- &chandef, true);
+ &chandef, false);
sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
local->rx_chains);
--
cgit v0.9.2