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This contains just a single fix for a crash I happened to randomly 

run into today during testing. It's clearly been around for a while,
 but is pretty hard to trigger, even when I tried explicitly (and
 modified the code to make it more likely) it rarely did.
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Merge tag 'mac80211-for-davem-2015-04-01' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
This contains just a single fix for a crash I happened to randomly
run into today during testing. It's clearly been around for a while,
but is pretty hard to trigger, even when I tried explicitly (and
modified the code to make it more likely) it rarely did.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-04-01 14:19:22 -04:00
parent 9c026424db 788211d81b
commit af3e09e666
3 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/mac80211/agg-rx.c
View File

@ -49,8 +49,6 @@ static void ieee80211_free_tid_rx(struct rcu_head *h)
container_of(h, struct tid_ampdu_rx, rcu_head);
int i;
del_timer_sync(&tid_rx->reorder_timer);
for (i = 0; i < tid_rx->buf_size; i++)
__skb_queue_purge(&tid_rx->reorder_buf[i]);
kfree(tid_rx->reorder_buf);
@ -93,6 +91,12 @@ void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
del_timer_sync(&tid_rx->session_timer);
/* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */
spin_lock_bh(&tid_rx->reorder_lock);
tid_rx->removed = true;
spin_unlock_bh(&tid_rx->reorder_lock);
del_timer_sync(&tid_rx->reorder_timer);
call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
}

7
net/mac80211/rx.c
View File

@ -873,9 +873,10 @@ static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
set_release_timer:
mod_timer(&tid_agg_rx->reorder_timer,
tid_agg_rx->reorder_time[j] + 1 +
HT_RX_REORDER_BUF_TIMEOUT);
if (!tid_agg_rx->removed)
mod_timer(&tid_agg_rx->reorder_timer,
tid_agg_rx->reorder_time[j] + 1 +
HT_RX_REORDER_BUF_TIMEOUT);
} else {
del_timer(&tid_agg_rx->reorder_timer);
}

2
net/mac80211/sta_info.h
View File

@ -175,6 +175,7 @@ struct tid_ampdu_tx {
* @reorder_lock: serializes access to reorder buffer, see below.
* @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
* and ssn.
* @removed: this session is removed (but might have been found due to RCU)
*
* This structure's lifetime is managed by RCU, assignments to
* the array holding it must hold the aggregation mutex.
@ -199,6 +200,7 @@ struct tid_ampdu_rx {
u16 timeout;
u8 dialog_token;
bool auto_seq;
bool removed;
};
/**