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mt76: mt76x02: remove irqsave/restore in locking for tx status fifo 

Use a separate lock and spin_trylock to avoid disabling interrupts.
Should improve performance and latency

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-01-31 22:38:28 +01:00
parent 2ac515a5d7
commit 6fe5333787
3 changed files with 6 additions and 3 deletions
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1
drivers/net/wireless/mediatek/mt76/mt76x02.h
View File

@ -86,6 +86,7 @@ struct mt76x02_dev {
u8 txdone_seq;
DECLARE_KFIFO_PTR(txstatus_fifo, struct mt76x02_tx_status);
spinlock_t txstatus_fifo_lock;
struct sk_buff *rx_head;

7
drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
View File

@ -739,7 +739,6 @@ int mt76x02_mac_process_rx(struct mt76x02_dev *dev, struct sk_buff *skb,
void mt76x02_mac_poll_tx_status(struct mt76x02_dev *dev, bool irq)
{
struct mt76x02_tx_status stat = {};
unsigned long flags;
u8 update = 1;
bool ret;
@ -749,9 +748,11 @@ void mt76x02_mac_poll_tx_status(struct mt76x02_dev *dev, bool irq)
trace_mac_txstat_poll(dev);
while (!irq || !kfifo_is_full(&dev->txstatus_fifo)) {
spin_lock_irqsave(&dev->mt76.mmio.irq_lock, flags);
if (!spin_trylock(&dev->txstatus_fifo_lock))
break;
ret = mt76x02_mac_load_tx_status(dev, &stat);
spin_unlock_irqrestore(&dev->mt76.mmio.irq_lock, flags);
spin_unlock(&dev->txstatus_fifo_lock);
if (!ret)
break;

1
drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
View File

@ -201,6 +201,7 @@ int mt76x02_dma_init(struct mt76x02_dev *dev)
tasklet_init(&dev->pre_tbtt_tasklet, mt76x02_pre_tbtt_tasklet,
(unsigned long)dev);
spin_lock_init(&dev->txstatus_fifo_lock);
kfifo_init(&dev->txstatus_fifo, status_fifo, fifo_size);
mt76_dma_attach(&dev->mt76);