diff options
| author | Christian Lamparter <chunkeey@googlemail.com> | 2010-10-30 01:26:13 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-11-15 21:25:32 +0300 |
| commit | e4a668c59080f862af3ecc28b359533027cbe434 (patch) | |
| tree | d9be11d5be940d49dfbb1f03c381c58799c9f78c /drivers/net/wireless/ath | |
| parent | e27769059ccb15273a7eb69ed31b8e08f9b0eda8 (diff) | |
| download | linux-e4a668c59080f862af3ecc28b359533027cbe434.tar.xz | |
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 <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath')
| -rw-r--r-- | drivers/net/wireless/ath/carl9170/carl9170.h | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/carl9170/main.c | 17 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/carl9170/usb.c | 2 |
3 files changed, 20 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath/carl9170/carl9170.h b/drivers/net/wireless/ath/carl9170/carl9170.h index b69d31972c77..d07ff7f2fd92 100644 --- a/drivers/net/wireless/ath/carl9170/carl9170.h +++ b/drivers/net/wireless/ath/carl9170/carl9170.h @@ -215,7 +215,7 @@ enum carl9170_restart_reasons { CARL9170_RR_TOO_MANY_FIRMWARE_ERRORS, CARL9170_RR_WATCHDOG, CARL9170_RR_STUCK_TX, - CARL9170_RR_SLOW_SYSTEM, + CARL9170_RR_UNRESPONSIVE_DEVICE, CARL9170_RR_COMMAND_TIMEOUT, CARL9170_RR_TOO_MANY_PHY_ERRORS, CARL9170_RR_LOST_RSP, @@ -287,6 +287,7 @@ struct ar9170 { /* reset / stuck frames/queue detection */ struct work_struct restart_work; + struct work_struct ping_work; unsigned int restart_counter; unsigned long queue_stop_timeout[__AR9170_NUM_TXQ]; unsigned long max_queue_stop_timeout[__AR9170_NUM_TXQ]; diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c index d521bc2b0496..4ae6a5849076 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); diff --git a/drivers/net/wireless/ath/carl9170/usb.c b/drivers/net/wireless/ath/carl9170/usb.c index d8607f4c144d..ddf5373ee689 100644 --- a/drivers/net/wireless/ath/carl9170/usb.c +++ b/drivers/net/wireless/ath/carl9170/usb.c @@ -431,7 +431,7 @@ static void carl9170_usb_rx_complete(struct urb *urb) * device. */ - carl9170_restart(ar, CARL9170_RR_SLOW_SYSTEM); + ieee80211_queue_work(ar->hw, &ar->ping_work); } } else { /* |