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libertas: detect TX lockups and reset hardware

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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 <dsd@laptop.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Daniel Drake 2011-10-03 11:33:02 +01:00 committed by John W. Linville
parent 8a3a3c85e4
commit 8f641d93c3
2 changed files with 36 additions and 0 deletions
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1
drivers/net/wireless/libertas/dev.h
View File

@ -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;

35
drivers/net/wireless/libertas/main.c
View File

@ -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);
@ -734,6 +740,32 @@ out:
lbs_deb_leave(LBS_DEB_CMD);
}
/**
* 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.
@ -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);