From e4a668c59080f862af3ecc28b359533027cbe434 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Fri, 29 Oct 2010 23:26:13 +0200 Subject: carl9170: fix spurious restart due to high latency RX Stress tests of unidirectional bulk traffic with bitrates of up to 220Mbit/s have revealed that the fatal-event recovery logic [which was solely triggered by an out-of-rx-buffer situation] is too aggressive. The new method now "pings" the device and then decides - based on the response - whenever a restart is needed or not. Signed-off-by: Christian Lamparter Signed-off-by: John W. Linville --- drivers/net/wireless/ath/carl9170/main.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'drivers/net/wireless/ath/carl9170/main.c') diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c index d521bc2..4ae6a58 100644 --- a/drivers/net/wireless/ath/carl9170/main.c +++ b/drivers/net/wireless/ath/carl9170/main.c @@ -428,6 +428,7 @@ static void carl9170_cancel_worker(struct ar9170 *ar) cancel_delayed_work_sync(&ar->led_work); #endif /* CONFIG_CARL9170_LEDS */ cancel_work_sync(&ar->ps_work); + cancel_work_sync(&ar->ping_work); cancel_work_sync(&ar->ampdu_work); } @@ -533,6 +534,21 @@ void carl9170_restart(struct ar9170 *ar, const enum carl9170_restart_reasons r) */ } +static void carl9170_ping_work(struct work_struct *work) +{ + struct ar9170 *ar = container_of(work, struct ar9170, ping_work); + int err; + + if (!IS_STARTED(ar)) + return; + + mutex_lock(&ar->mutex); + err = carl9170_echo_test(ar, 0xdeadbeef); + if (err) + carl9170_restart(ar, CARL9170_RR_UNRESPONSIVE_DEVICE); + mutex_unlock(&ar->mutex); +} + static int carl9170_init_interface(struct ar9170 *ar, struct ieee80211_vif *vif) { @@ -1614,6 +1630,7 @@ void *carl9170_alloc(size_t priv_size) skb_queue_head_init(&ar->tx_pending[i]); } INIT_WORK(&ar->ps_work, carl9170_ps_work); + INIT_WORK(&ar->ping_work, carl9170_ping_work); INIT_WORK(&ar->restart_work, carl9170_restart_work); INIT_WORK(&ar->ampdu_work, carl9170_ampdu_work); INIT_DELAYED_WORK(&ar->tx_janitor, carl9170_tx_janitor); -- cgit v1.1