2009-03-23 16:32:32

by Johannes Berg

Subject: [PATCH 4/8] mac80211: clean up __ieee80211_tx args

__ieee80211_tx takes a struct ieee80211_tx_data argument, but only
uses a few of its members, namely 'skb' and 'sta'. Make that explicit,
so that less internal knowledge is required in ieee80211_tx_pending
and the possibility of introducing errors here is removed.

Signed-off-by: Johannes Berg <[email protected]>
---
net/mac80211/tx.c | 31 ++++++++++++++++---------------
1 file changed, 16 insertions(+), 15 deletions(-)

--- wireless-testing.orig/net/mac80211/tx.c 2009-03-23 14:03:45.000000000 +0100
+++ wireless-testing/net/mac80211/tx.c 2009-03-23 14:03:46.000000000 +0100
@@ -1084,9 +1084,10 @@ static int ieee80211_tx_prepare(struct i
}

static int __ieee80211_tx(struct ieee80211_local *local,
- struct ieee80211_tx_data *tx)
+ struct sk_buff **skbp,
+ struct sta_info *sta)
{
- struct sk_buff *skb = tx->skb, *next;
+ struct sk_buff *skb = *skbp, *next;
struct ieee80211_tx_info *info;
int ret;
bool fragm = false;
@@ -1111,23 +1112,23 @@ static int __ieee80211_tx(struct ieee802
* We will later move this down into the only driver that
* needs it, iwlwifi.
*/
- if (tx->sta && local->hw.ampdu_queues &&
+ if (sta && local->hw.ampdu_queues &&
info->flags & IEEE80211_TX_CTL_AMPDU) {
unsigned long flags;
u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
int tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

- spin_lock_irqsave(&tx->sta->lock, flags);
+ spin_lock_irqsave(&sta->lock, flags);
skb_set_queue_mapping(skb, local->hw.queues +
- tx->sta->tid_to_tx_q[tid]);
- spin_unlock_irqrestore(&tx->sta->lock, flags);
+ sta->tid_to_tx_q[tid]);
+ spin_unlock_irqrestore(&sta->lock, flags);
}

next = skb->next;
ret = local->ops->tx(local_to_hw(local), skb);
if (ret != NETDEV_TX_OK)
return IEEE80211_TX_AGAIN;
- tx->skb = skb = next;
+ *skbp = skb = next;
ieee80211_led_tx(local, 1);
fragm = true;
}
@@ -1223,7 +1224,7 @@ static int ieee80211_tx(struct net_devic

retries = 0;
retry:
- ret = __ieee80211_tx(local, &tx);
+ ret = __ieee80211_tx(local, &tx.skb, tx.sta);
switch (ret) {
case IEEE80211_TX_OK:
break;
@@ -1831,7 +1832,6 @@ void ieee80211_tx_pending(unsigned long
struct net_device *dev = local->mdev;
struct ieee80211_hdr *hdr;
unsigned long flags;
- struct ieee80211_tx_data tx;
int i, ret;
bool next;

@@ -1862,14 +1862,15 @@ void ieee80211_tx_pending(unsigned long
netif_start_subqueue(local->mdev, i);

while (!skb_queue_empty(&local->pending[i])) {
- tx.flags = 0;
- tx.skb = skb_dequeue(&local->pending[i]);
- hdr = (struct ieee80211_hdr *)tx.skb->data;
- tx.sta = sta_info_get(local, hdr->addr1);
+ struct sk_buff *skb = skb_dequeue(&local->pending[i]);
+ struct sta_info *sta;
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ sta = sta_info_get(local, hdr->addr1);

- ret = __ieee80211_tx(local, &tx);
+ ret = __ieee80211_tx(local, &skb, sta);
if (ret != IEEE80211_TX_OK) {
- skb_queue_head(&local->pending[i], tx.skb);
+ skb_queue_head(&local->pending[i], skb);
break;
}
}

--

2009-03-27 22:27:01

by Luis Chamberlain

Subject: Re: [PATCH 4/8] mac80211: clean up __ieee80211_tx args

On Mon, Mar 23, 2009 at 05:28:38PM +0100, Johannes Berg wrote:
> __ieee80211_tx takes a struct ieee80211_tx_data argument, but only
> uses a few of its members, namely 'skb' and 'sta'. Make that explicit,
> so that less internal knowledge is required in ieee80211_tx_pending
> and the possibility of introducing errors here is removed.
>
> Signed-off-by: Johannes Berg <[email protected]>

Reviewed-by: Luis R. Rodriguez <[email protected]>

Luis