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p54spi: fix locking warning in p54spi_op_tx

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This patch fixes the following waring:
> ------------[ cut here ]------------
>WARNING: at kernel/softirq.c:138 local_bh_enable+0x54/0xbc()
>Modules linked in: p54spi
>[<c0034ff8>] (dump_stack+0x0/0x14)
>[<c005b1a4>] (warn_on_slowpath+0x0/0x68)
>[<c00604c8>] (local_bh_enable+0x0/0xbc)
>[<bf000000>] (p54spi_op_tx+0x0/0x4c [p54spi])
>[<c01a4d34>] (p54_sta_unlock+0x0/0x78)

p54spi_op_tx needs to be called from different locking contexts.
Therefore we have to protect the linked list with irqsave spinlocks.

Reported-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2009-03-30 15:55:24 +02:00 committed by John W. Linville
parent 540828196e
commit 731c653168
1 changed files with 13 additions and 12 deletions
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25
drivers/net/wireless/p54/p54spi.c
View File

@ -457,9 +457,10 @@ static int p54spi_wq_tx(struct p54s_priv *priv)
struct ieee80211_tx_info *info;
struct p54_tx_info *minfo;
struct p54s_tx_info *dinfo;
unsigned long flags;
int ret = 0;
spin_lock_bh(&priv->tx_lock);
spin_lock_irqsave(&priv->tx_lock, flags);
while (!list_empty(&priv->tx_pending)) {
entry = list_entry(priv->tx_pending.next,
@ -467,7 +468,7 @@ static int p54spi_wq_tx(struct p54s_priv *priv)
list_del_init(&entry->tx_list);
spin_unlock_bh(&priv->tx_lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
dinfo = container_of((void *) entry, struct p54s_tx_info,
tx_list);
@ -479,16 +480,14 @@ static int p54spi_wq_tx(struct p54s_priv *priv)
ret = p54spi_tx_frame(priv, skb);
spin_lock_bh(&priv->tx_lock);
if (ret < 0) {
p54_free_skb(priv->hw, skb);
goto out;
}
return ret;
}
out:
spin_unlock_bh(&priv->tx_lock);
spin_lock_irqsave(&priv->tx_lock, flags);
}
spin_unlock_irqrestore(&priv->tx_lock, flags);
return ret;
}
@ -498,12 +497,13 @@ static void p54spi_op_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct p54_tx_info *mi = (struct p54_tx_info *) info->rate_driver_data;
struct p54s_tx_info *di = (struct p54s_tx_info *) mi->data;
unsigned long flags;
BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));
spin_lock_bh(&priv->tx_lock);
spin_lock_irqsave(&priv->tx_lock, flags);
list_add_tail(&di->tx_list, &priv->tx_pending);
spin_unlock_bh(&priv->tx_lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
queue_work(priv->hw->workqueue, &priv->work);
}
@ -604,6 +604,7 @@ out:
static void p54spi_op_stop(struct ieee80211_hw *dev)
{
struct p54s_priv *priv = dev->priv;
unsigned long flags;
if (mutex_lock_interruptible(&priv->mutex)) {
/* FIXME: how to handle this error? */
@ -615,9 +616,9 @@ static void p54spi_op_stop(struct ieee80211_hw *dev)
cancel_work_sync(&priv->work);
p54spi_power_off(priv);
spin_lock_bh(&priv->tx_lock);
spin_lock_irqsave(&priv->tx_lock, flags);
INIT_LIST_HEAD(&priv->tx_pending);
spin_unlock_bh(&priv->tx_lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
priv->fw_state = FW_STATE_OFF;
mutex_unlock(&priv->mutex);