From 8f641d93c38ae93c67263d4e03f793092d471b12 Mon Sep 17 00:00:00 2001 From: Daniel Drake Date: Mon, 3 Oct 2011 11:33:02 +0100 Subject: [PATCH] libertas: detect TX lockups and reset hardware Recent patches added support for resetting the SD8686 hardware when commands time out, which seems to happen quite frequently soon after resuming the system from a Wake-on-WLAN-triggered resume. At http://dev.laptop.org/ticket/10969 we see the same thing happen with transmits. In this case, the hardware will fail to respond to a frame passed for transmission, and libertas (correctly) will block all further commands and transmissions as the hardware can only deal with one thing at a time. This results in a lockup while the system waits indefinitely for the dead card to respond. Hook up a TX lockup timer to detect this and reset the hardware. Signed-off-by: Daniel Drake Signed-off-by: John W. Linville --- drivers/net/wireless/libertas/dev.h | 1 + drivers/net/wireless/libertas/main.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/drivers/net/wireless/libertas/dev.h b/drivers/net/wireless/libertas/dev.h index fb3e40b..f3fd447 100644 --- a/drivers/net/wireless/libertas/dev.h +++ b/drivers/net/wireless/libertas/dev.h @@ -158,6 +158,7 @@ struct lbs_private { /* protected by hard_start_xmit serialization */ u8 txretrycount; struct sk_buff *currenttxskb; + struct timer_list tx_lockup_timer; /* Locks */ struct mutex lock; diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c index d62d1fb..6a326233 100644 --- a/drivers/net/wireless/libertas/main.c +++ b/drivers/net/wireless/libertas/main.c @@ -188,6 +188,7 @@ int lbs_stop_iface(struct lbs_private *priv) spin_unlock_irqrestore(&priv->driver_lock, flags); cancel_work_sync(&priv->mcast_work); + del_timer_sync(&priv->tx_lockup_timer); /* Disable command processing, and wait for all commands to complete */ lbs_deb_main("waiting for commands to complete\n"); @@ -243,6 +244,7 @@ void lbs_host_to_card_done(struct lbs_private *priv) lbs_deb_enter(LBS_DEB_THREAD); spin_lock_irqsave(&priv->driver_lock, flags); + del_timer(&priv->tx_lockup_timer); priv->dnld_sent = DNLD_RES_RECEIVED; @@ -585,6 +587,9 @@ static int lbs_thread(void *data) if (ret) { lbs_deb_tx("host_to_card failed %d\n", ret); priv->dnld_sent = DNLD_RES_RECEIVED; + } else { + mod_timer(&priv->tx_lockup_timer, + jiffies + (HZ * 5)); } priv->tx_pending_len = 0; if (!priv->currenttxskb) { @@ -601,6 +606,7 @@ static int lbs_thread(void *data) } del_timer(&priv->command_timer); + del_timer(&priv->tx_lockup_timer); del_timer(&priv->auto_deepsleep_timer); lbs_deb_leave(LBS_DEB_THREAD); @@ -735,6 +741,32 @@ out: } /** + * lbs_tx_lockup_handler - handles the timeout of the passing of TX frames + * to the hardware. This is known to frequently happen with SD8686 when + * waking up after a Wake-on-WLAN-triggered resume. + * + * @data: &struct lbs_private pointer + */ +static void lbs_tx_lockup_handler(unsigned long data) +{ + struct lbs_private *priv = (struct lbs_private *)data; + unsigned long flags; + + lbs_deb_enter(LBS_DEB_TX); + spin_lock_irqsave(&priv->driver_lock, flags); + + netdev_info(priv->dev, "TX lockup detected\n"); + if (priv->reset_card) + priv->reset_card(priv); + + priv->dnld_sent = DNLD_RES_RECEIVED; + wake_up_interruptible(&priv->waitq); + + spin_unlock_irqrestore(&priv->driver_lock, flags); + lbs_deb_leave(LBS_DEB_TX); +} + +/** * auto_deepsleep_timer_fn - put the device back to deep sleep mode when * timer expires and no activity (command, event, data etc.) is detected. * @data: &struct lbs_private pointer @@ -820,6 +852,8 @@ static int lbs_init_adapter(struct lbs_private *priv) setup_timer(&priv->command_timer, lbs_cmd_timeout_handler, (unsigned long)priv); + setup_timer(&priv->tx_lockup_timer, lbs_tx_lockup_handler, + (unsigned long)priv); setup_timer(&priv->auto_deepsleep_timer, auto_deepsleep_timer_fn, (unsigned long)priv); @@ -857,6 +891,7 @@ static void lbs_free_adapter(struct lbs_private *priv) lbs_free_cmd_buffer(priv); kfifo_free(&priv->event_fifo); del_timer(&priv->command_timer); + del_timer(&priv->tx_lockup_timer); del_timer(&priv->auto_deepsleep_timer); lbs_deb_leave(LBS_DEB_MAIN); -- 2.7.4