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rt2x00: pause almost full queue early 

Do not drop &queue->tx_lock and acquire it again to pause queue when
available entries are below the threshold.

Patch should mitigate problem of frequently printed errors:
"Error - Dropping frame due to full tx queue"

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Tested-by: Enrico Mioso@gmail.com
Tested-by: Enrico Mioso <mrkiko.rs@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Stanislaw Gruszka 2017-12-19 12:33:55 +01:00 committed by Kalle Valo
parent b713bbf147
commit 3d8f162cb8
2 changed files with 8 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/wireless/ralink/rt2x00/rt2x00mac.c
View File

@ -152,16 +152,6 @@ void rt2x00mac_tx(struct ieee80211_hw *hw,
if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
goto exit_fail;
/*
* Pausing queue has to be serialized with rt2x00lib_txdone(). Note
* we should not use spin_lock_bh variant as bottom halve was already
* disabled before ieee80211_xmit() call.
*/
spin_lock(&queue->tx_lock);
if (rt2x00queue_threshold(queue))
rt2x00queue_pause_queue(queue);
spin_unlock(&queue->tx_lock);
return;
exit_fail:

8
drivers/net/wireless/ralink/rt2x00/rt2x00queue.c
View File

@ -715,6 +715,14 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
rt2x00queue_kick_tx_queue(queue, &txdesc);
out:
/*
* Pausing queue has to be serialized with rt2x00lib_txdone(), so we
* do this under queue->tx_lock. Bottom halve was already disabled
* before ieee80211_xmit() call.
*/
if (rt2x00queue_threshold(queue))
rt2x00queue_pause_queue(queue);
spin_unlock(&queue->tx_lock);
return ret;
}