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mac80211: fix ieee80211_get_buffered_bc

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fix bss not initialized in ieee80211_get_buffered_bc
and unbalanced locking

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Tomas Winkler 2008-05-27 17:50:51 +03:00 committed by John W. Linville
parent 20ad4fd562
commit 747cf5e924
1 changed files with 7 additions and 9 deletions
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16
net/mac80211/tx.c
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@ -1947,7 +1947,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct ieee80211_local *local = hw_to_local(hw);
struct sk_buff *skb;
struct sk_buff *skb = NULL;
struct sta_info *sta;
ieee80211_tx_handler *handler;
struct ieee80211_tx_data tx;
@ -1960,7 +1960,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
sdata = vif_to_sdata(vif);
bdev = sdata->dev;
bss = &sdata->u.ap;
if (!bss)
return NULL;
@ -1968,19 +1968,16 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
rcu_read_lock();
beacon = rcu_dereference(bss->beacon);
if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon ||
!beacon->head) {
rcu_read_unlock();
return NULL;
}
if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || !beacon->head)
goto out;
if (bss->dtim_count != 0)
return NULL; /* send buffered bc/mc only after DTIM beacon */
goto out; /* send buffered bc/mc only after DTIM beacon */
while (1) {
skb = skb_dequeue(&bss->ps_bc_buf);
if (!skb)
return NULL;
goto out;
local->total_ps_buffered--;
if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
@ -2023,6 +2020,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
skb = NULL;
}
out:
rcu_read_unlock();
return skb;