lkml.org 
[lkml]   [2019]   [Feb]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.20 008/183] mac80211: Restore vif beacon interval if start ap fails
Date
4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rakesh Pillai <pillair@codeaurora.org>

commit 83e37e0bdd1470bbe6612250b745ad39b1a7b130 upstream.

The starting of AP interface can fail due to invalid
beacon interval, which does not match the minimum gcd
requirement set by the wifi driver. In such case, the
beacon interval of that interface gets updated with
that invalid beacon interval.

The next time that interface is brought up in AP mode,
an interface combination check is performed and the
beacon interval is taken from the previously set value.

In a case where an invalid beacon interval, i.e. a beacon
interval value which does not satisfy the minimum gcd criteria
set by the driver, is set, all the subsequent trials to
bring that interface in AP mode will fail, even if the
subsequent trials have a valid beacon interval.

To avoid this, in case of a failure in bringing up an
interface in AP mode due to interface combination error,
the interface beacon interval which is stored in bss
conf, needs to be restored with the last working value
of beacon interval.

Tested on ath10k using WCN3990.

Cc: stable@vger.kernel.org
Fixes: 0c317a02ca98 ("cfg80211: support virtual interfaces with different beacon intervals")
Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/mac80211/cfg.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -941,6 +941,7 @@ static int ieee80211_start_ap(struct wip
BSS_CHANGED_P2P_PS |
BSS_CHANGED_TXPOWER;
int err;
+ int prev_beacon_int;

old = sdata_dereference(sdata->u.ap.beacon, sdata);
if (old)
@@ -963,6 +964,7 @@ static int ieee80211_start_ap(struct wip

sdata->needed_rx_chains = sdata->local->rx_chains;

+ prev_beacon_int = sdata->vif.bss_conf.beacon_int;
sdata->vif.bss_conf.beacon_int = params->beacon_interval;

if (params->he_cap)
@@ -974,8 +976,10 @@ static int ieee80211_start_ap(struct wip
if (!err)
ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
mutex_unlock(&local->mtx);
- if (err)
+ if (err) {
+ sdata->vif.bss_conf.beacon_int = prev_beacon_int;
return err;
+ }

/*
* Apply control port protocol, this allows us to

\
 
 \ /
  Last update: 2019-02-25 22:46    [W:0.454 / U:35.912 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site