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rt2x00: Reduce window of a queue's tx lock. 

Currently a lot of actions that can be done without the queue's tx lock
being held are done inside the locked area.
Move them out to have a leaner and meaner code that operates while the
tx lock is being held.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Gertjan van Wingerde 2011-07-06 22:57:37 +02:00 committed by John W. Linville
parent 77b5621bac
commit 128f8f773d
1 changed files with 26 additions and 25 deletions
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51
drivers/net/wireless/rt2x00/rt2x00queue.c
View File

@ -565,33 +565,11 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
u8 rate_idx, rate_flags;
int ret = 0;
spin_lock(&queue->tx_lock);
entry = rt2x00queue_get_entry(queue, Q_INDEX);
if (unlikely(rt2x00queue_full(queue))) {
ERROR(queue->rt2x00dev,
"Dropping frame due to full tx queue %d.\n", queue->qid);
ret = -ENOBUFS;
goto out;
}
if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA,
&entry->flags))) {
ERROR(queue->rt2x00dev,
"Arrived at non-free entry in the non-full queue %d.\n"
"Please file bug report to %s.\n",
queue->qid, DRV_PROJECT);
ret = -EINVAL;
goto out;
}
/*
* Copy all TX descriptor information into txdesc,
* after that we are free to use the skb->cb array
* for our information.
*/
entry->skb = skb;
rt2x00queue_create_tx_descriptor(queue->rt2x00dev, skb, &txdesc);
/*
@ -604,7 +582,6 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
rate_flags = tx_info->control.rates[0].flags;
skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
skbdesc->entry = entry;
skbdesc->tx_rate_idx = rate_idx;
skbdesc->tx_rate_flags = rate_flags;
@ -633,9 +610,33 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
* for PCI devices.
*/
if (test_bit(REQUIRE_L2PAD, &queue->rt2x00dev->cap_flags))
rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
rt2x00queue_insert_l2pad(skb, txdesc.header_length);
else if (test_bit(REQUIRE_DMA, &queue->rt2x00dev->cap_flags))
rt2x00queue_align_frame(entry->skb);
rt2x00queue_align_frame(skb);
spin_lock(&queue->tx_lock);
if (unlikely(rt2x00queue_full(queue))) {
ERROR(queue->rt2x00dev,
"Dropping frame due to full tx queue %d.\n", queue->qid);
ret = -ENOBUFS;
goto out;
}
entry = rt2x00queue_get_entry(queue, Q_INDEX);
if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA,
&entry->flags))) {
ERROR(queue->rt2x00dev,
"Arrived at non-free entry in the non-full queue %d.\n"
"Please file bug report to %s.\n",
queue->qid, DRV_PROJECT);
ret = -EINVAL;
goto out;
}
skbdesc->entry = entry;
entry->skb = skb;
/*
* It could be possible that the queue was corrupted and this