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wl12xx: Avoid redundant TX work

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TX might be handled in the threaded IRQ handler, in which case, TX work
might be scheduled just to discover it has nothing to do.

Save a few context switches by cancelling redundant TX work in case TX
is about to be handled in the threaded IRQ handler. Also, avoid
scheduling TX work from wl1271_op_tx if not needed.

Signed-off-by: Ido Yariv <ido@wizery.com>
Reviewed-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
This commit is contained in:
Ido Yariv 2011-03-01 15:14:43 +02:00 committed by Luciano Coelho
parent 2da69b890f
commit b07d403705
2 changed files with 28 additions and 5 deletions
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32
drivers/net/wireless/wl12xx/main.c
View File

@ -668,6 +668,11 @@ irqreturn_t wl1271_irq(int irq, void *cookie)
struct wl1271 *wl = (struct wl1271 *)cookie;
bool done = false;
unsigned int defer_count;
unsigned long flags;
/* TX might be handled here, avoid redundant work */
set_bit(WL1271_FLAG_TX_PENDING, &wl->flags);
cancel_work_sync(&wl->tx_work);
mutex_lock(&wl->mutex);
@ -712,13 +717,17 @@ irqreturn_t wl1271_irq(int irq, void *cookie)
wl1271_rx(wl, &wl->fw_status->common);
/* Check if any tx blocks were freed */
spin_lock_irqsave(&wl->wl_lock, flags);
if (!test_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags) &&
wl->tx_queue_count) {
spin_unlock_irqrestore(&wl->wl_lock, flags);
/*
* In order to avoid starvation of the TX path,
* call the work function directly.
*/
wl1271_tx_work_locked(wl);
} else {
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
/* check for tx results */
@ -754,6 +763,14 @@ irqreturn_t wl1271_irq(int irq, void *cookie)
wl1271_ps_elp_sleep(wl);
out:
spin_lock_irqsave(&wl->wl_lock, flags);
/* In case TX was not handled here, queue TX work */
clear_bit(WL1271_FLAG_TX_PENDING, &wl->flags);
if (!test_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags) &&
wl->tx_queue_count)
ieee80211_queue_work(wl->hw, &wl->tx_work);
spin_unlock_irqrestore(&wl->wl_lock, flags);
mutex_unlock(&wl->mutex);
return IRQ_HANDLED;
@ -1068,7 +1085,13 @@ static void wl1271_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
int q;
u8 hlid = 0;
q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
if (wl->bss_type == BSS_TYPE_AP_BSS)
hlid = wl1271_tx_get_hlid(skb);
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count++;
/*
@ -1081,12 +1104,8 @@ static void wl1271_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
set_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
}
spin_unlock_irqrestore(&wl->wl_lock, flags);
/* queue the packet */
q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
if (wl->bss_type == BSS_TYPE_AP_BSS) {
hlid = wl1271_tx_get_hlid(skb);
wl1271_debug(DEBUG_TX, "queue skb hlid %d q %d", hlid, q);
skb_queue_tail(&wl->links[hlid].tx_queue[q], skb);
} else {
@ -1098,8 +1117,11 @@ static void wl1271_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
* before that, the tx_work will not be initialized!
*/
if (!test_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags))
if (!test_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags) &&
!test_bit(WL1271_FLAG_TX_PENDING, &wl->flags))
ieee80211_queue_work(wl->hw, &wl->tx_work);
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
static struct notifier_block wl1271_dev_notifier = {

1
drivers/net/wireless/wl12xx/wl12xx.h
View File

@ -317,6 +317,7 @@ enum wl12xx_flags {
WL1271_FLAG_JOINED,
WL1271_FLAG_GPIO_POWER,
WL1271_FLAG_TX_QUEUE_STOPPED,
WL1271_FLAG_TX_PENDING,
WL1271_FLAG_IN_ELP,
WL1271_FLAG_PSM,
WL1271_FLAG_PSM_REQUESTED,