rt2x00: Limit rt2800pci txdone processing to 16 entries at once

Instead of reporting an unlimited number of tx status reports to
mac80211 stop after 16 frames and reschedule the tx status tasklet.
This allows other tasklets to be run inbetween.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rt2x00/rt2800pci.c b/drivers/net/wireless/rt2x00/rt2800pci.c
index 4672dc99fe46562c3d4276f35ef897a7cccaccc4..d3055147ddfbd4ead36705ea1926dabb5628579a 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2800pci.c
+++ b/drivers/net/wireless/rt2x00/rt2800pci.c
@@ -717,12 +717,13 @@ static void rt2800pci_wakeup(struct rt2x00_dev *rt2x00dev)
        rt2800_config(rt2x00dev, &libconf, IEEE80211_CONF_CHANGE_PS);
 }
 
-static void rt2800pci_txdone(struct rt2x00_dev *rt2x00dev)
+static bool rt2800pci_txdone(struct rt2x00_dev *rt2x00dev)
 {
        struct data_queue *queue;
        struct queue_entry *entry;
        u32 status;
        u8 qid;
+       int max_tx_done = 16;
 
        while (kfifo_get(&rt2x00dev->txstatus_fifo, &status)) {
                qid = rt2x00_get_field32(status, TX_STA_FIFO_PID_QUEUE);
@@ -759,7 +760,12 @@ static void rt2800pci_txdone(struct rt2x00_dev *rt2x00dev)
 
                entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
                rt2800_txdone_entry(entry, status);
+
+               if (--max_tx_done == 0)
+                       break;
        }
+
+       return !max_tx_done;
 }
 
 static void rt2800pci_enable_interrupt(struct rt2x00_dev *rt2x00dev,
@@ -780,7 +786,9 @@ static void rt2800pci_enable_interrupt(struct rt2x00_dev *rt2x00dev,
 
 static void rt2800pci_txstatus_tasklet(unsigned long data)
 {
-       rt2800pci_txdone((struct rt2x00_dev *)data);
+       struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
+       if (rt2800pci_txdone(rt2x00dev))
+               tasklet_schedule(&rt2x00dev->txstatus_tasklet);
 
        /*
         * No need to enable the tx status interrupt here as we always