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mac80211: remove ignore_plink_timer flag 

The mesh_plink code is doing some interesting things with the
ignore_plink_timer flag.  It seems the original intent was to
handle this race:

cpu 0                           cpu 1
-----                           -----
                                start timer handler for state X
acquire sta_lock
change state from X to Y
mod_timer() / del_timer()
release sta_lock
                                acquire sta_lock
                                execute state Y timer too soon

However, using the mod_timer()/del_timer() return values to
detect these cases is broken.  As a result, timers get ignored
unnecessarily, and stations can get stuck in the peering state
machine.

Instead, we can detect the case by looking at the timer expiration.
In the case of del_timer, just ignore the timers in the following
(LISTEN/ESTAB) states since they won't have timers anyway.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Bob Copeland 2014-06-04 09:27:31 -04:00 committed by Johannes Berg
parent 5ac2e35030
commit 2b470c39e8
2 changed files with 23 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
net/mac80211/mesh_plink.c
View File

@ -551,11 +551,30 @@ static void mesh_plink_timer(unsigned long data)
return;
spin_lock_bh(&sta->lock);
if (sta->ignore_plink_timer) {
sta->ignore_plink_timer = false;
/* If a timer fires just before a state transition on another CPU,
* we may have already extended the timeout and changed state by the
* time we've acquired the lock and arrived here. In that case,
* skip this timer and wait for the new one.
*/
if (time_before(jiffies, sta->plink_timer.expires)) {
mpl_dbg(sta->sdata,
"Ignoring timer for %pM in state %s (timer adjusted)",
sta->sta.addr, mplstates[sta->plink_state]);
spin_unlock_bh(&sta->lock);
return;
}
/* del_timer() and handler may race when entering these states */
if (sta->plink_state == NL80211_PLINK_LISTEN ||
sta->plink_state == NL80211_PLINK_ESTAB) {
mpl_dbg(sta->sdata,
"Ignoring timer for %pM in state %s (timer deleted)",
sta->sta.addr, mplstates[sta->plink_state]);
spin_unlock_bh(&sta->lock);
return;
}
mpl_dbg(sta->sdata,
"Mesh plink timer for %pM fired on state %s\n",
sta->sta.addr, mplstates[sta->plink_state]);
@ -773,9 +792,7 @@ static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
break;
case CNF_ACPT:
sta->plink_state = NL80211_PLINK_CNF_RCVD;
if (!mod_plink_timer(sta,
mshcfg->dot11MeshConfirmTimeout))
sta->ignore_plink_timer = true;
mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
break;
default:
break;
@ -834,8 +851,7 @@ static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
case NL80211_PLINK_HOLDING:
switch (event) {
case CLS_ACPT:
if (del_timer(&sta->plink_timer))
sta->ignore_plink_timer = 1;
del_timer(&sta->plink_timer);
mesh_plink_fsm_restart(sta);
break;
case OPN_ACPT:

2
net/mac80211/sta_info.h
View File

@ -306,7 +306,6 @@ struct ieee80211_tx_latency_stat {
* @plid: Peer link ID
* @reason: Cancel reason on PLINK_HOLDING state
* @plink_retries: Retries in establishment
* @ignore_plink_timer: ignore the peer-link timer (used internally)
* @plink_state: peer link state
* @plink_timeout: timeout of peer link
* @plink_timer: peer link watch timer
@ -421,7 +420,6 @@ struct sta_info {
u16 plid;
u16 reason;
u8 plink_retries;
bool ignore_plink_timer;
enum nl80211_plink_state plink_state;
u32 plink_timeout;
struct timer_list plink_timer;