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path: root/drivers/net/wireless/wl1251/tx.c
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Diffstat (limited to 'drivers/net/wireless/wl1251/tx.c')
-rw-r--r--drivers/net/wireless/wl1251/tx.c74
1 files changed, 32 insertions, 42 deletions
diff --git a/drivers/net/wireless/wl1251/tx.c b/drivers/net/wireless/wl1251/tx.c
index 554b4f9a3d3..28121c590a2 100644
--- a/drivers/net/wireless/wl1251/tx.c
+++ b/drivers/net/wireless/wl1251/tx.c
@@ -213,16 +213,30 @@ static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb,
wl1251_debug(DEBUG_TX, "skb offset %d", offset);
/* check whether the current skb can be used */
- if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
- unsigned char *src = skb->data;
+ if (skb_cloned(skb) || (skb_tailroom(skb) < offset)) {
+ struct sk_buff *newskb = skb_copy_expand(skb, 0, 3,
+ GFP_KERNEL);
+
+ if (unlikely(newskb == NULL)) {
+ wl1251_error("Can't allocate skb!");
+ return -EINVAL;
+ }
- /* align the buffer on a 4-byte boundary */
+ tx_hdr = (struct tx_double_buffer_desc *) newskb->data;
+
+ dev_kfree_skb_any(skb);
+ wl->tx_frames[tx_hdr->id] = skb = newskb;
+
+ offset = (4 - (long)skb->data) & 0x03;
+ wl1251_debug(DEBUG_TX, "new skb offset %d", offset);
+ }
+
+ /* align the buffer on a 4-byte boundary */
+ if (offset) {
+ unsigned char *src = skb->data;
skb_reserve(skb, offset);
memmove(skb->data, src, skb->len);
tx_hdr = (struct tx_double_buffer_desc *) skb->data;
- } else {
- wl1251_info("No handler, fixme!");
- return -EINVAL;
}
}
@@ -368,7 +382,7 @@ static void wl1251_tx_packet_cb(struct wl1251 *wl,
{
struct ieee80211_tx_info *info;
struct sk_buff *skb;
- int hdrlen, ret;
+ int hdrlen;
u8 *frame;
skb = wl->tx_frames[result->id];
@@ -407,40 +421,12 @@ static void wl1251_tx_packet_cb(struct wl1251 *wl,
ieee80211_tx_status(wl->hw, skb);
wl->tx_frames[result->id] = NULL;
-
- if (wl->tx_queue_stopped) {
- wl1251_debug(DEBUG_TX, "cb: queue was stopped");
-
- skb = skb_dequeue(&wl->tx_queue);
-
- /* The skb can be NULL because tx_work might have been
- scheduled before the queue was stopped making the
- queue empty */
-
- if (skb) {
- ret = wl1251_tx_frame(wl, skb);
- if (ret == -EBUSY) {
- /* firmware buffer is still full */
- wl1251_debug(DEBUG_TX, "cb: fw buffer "
- "still full");
- skb_queue_head(&wl->tx_queue, skb);
- return;
- } else if (ret < 0) {
- dev_kfree_skb(skb);
- return;
- }
- }
-
- wl1251_debug(DEBUG_TX, "cb: waking queues");
- ieee80211_wake_queues(wl->hw);
- wl->tx_queue_stopped = false;
- }
}
/* Called upon reception of a TX complete interrupt */
void wl1251_tx_complete(struct wl1251 *wl)
{
- int i, result_index, num_complete = 0;
+ int i, result_index, num_complete = 0, queue_len;
struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
unsigned long flags;
@@ -471,18 +457,22 @@ void wl1251_tx_complete(struct wl1251 *wl)
}
}
- if (wl->tx_queue_stopped
- &&
- skb_queue_len(&wl->tx_queue) <= WL1251_TX_QUEUE_LOW_WATERMARK){
+ queue_len = skb_queue_len(&wl->tx_queue);
- /* firmware buffer has space, restart queues */
+ if ((num_complete > 0) && (queue_len > 0)) {
+ /* firmware buffer has space, reschedule tx_work */
+ wl1251_debug(DEBUG_TX, "tx_complete: reschedule tx_work");
+ ieee80211_queue_work(wl->hw, &wl->tx_work);
+ }
+
+ if (wl->tx_queue_stopped &&
+ queue_len <= WL1251_TX_QUEUE_LOW_WATERMARK) {
+ /* tx_queue has space, restart queues */
wl1251_debug(DEBUG_TX, "tx_complete: waking queues");
spin_lock_irqsave(&wl->wl_lock, flags);
ieee80211_wake_queues(wl->hw);
wl->tx_queue_stopped = false;
spin_unlock_irqrestore(&wl->wl_lock, flags);
- ieee80211_queue_work(wl->hw, &wl->tx_work);
-
}
/* Every completed frame needs to be acknowledged */