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rt2x00: Fix sleep-while-atomic bug in powersaving code.

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The generic powersaving code that determines after reception of a frame
whether the device should go back to sleep or whether is could stay
awake was calling rt2x00lib_config directly from RX tasklet context.
On a number of the devices this call can actually sleep, due to having
to confirm that the sleeping commands have been executed successfully.

Fix this by moving the call to rt2x00lib_config to a workqueue call.

This fixes bug https://bugzilla.redhat.com/show_bug.cgi?id=731672

Tested-by: Tomas Trnka <tomastrnka@gmx.com>
Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Cc: <stable@vger.kernel.org>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Gertjan van Wingerde 2011-11-12 19:10:44 +01:00 committed by John W. Linville
parent c18b7806e4
commit ed66ba472a
2 changed files with 21 additions and 2 deletions
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1
drivers/net/wireless/rt2x00/rt2x00.h
View file

@ -943,6 +943,7 @@ struct rt2x00_dev {
* Powersaving work
*/
struct delayed_work autowakeup_work;
struct work_struct sleep_work;
/*
* Data queue arrays for RX, TX, Beacon and ATIM.

22
drivers/net/wireless/rt2x00/rt2x00dev.c
View file

@ -465,6 +465,23 @@ static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
return NULL;
}
static void rt2x00lib_sleep(struct work_struct *work)
{
struct rt2x00_dev *rt2x00dev =
container_of(work, struct rt2x00_dev, sleep_work);
if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
return;
/*
* Check again is powersaving is enabled, to prevent races from delayed
* work execution.
*/
if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
IEEE80211_CONF_CHANGE_PS);
}
static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb,
struct rxdone_entry_desc *rxdesc)
@ -512,8 +529,7 @@ static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
cam |= (tim_ie->bitmap_ctrl & 0x01);
if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
IEEE80211_CONF_CHANGE_PS);
queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
}
static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
@ -1141,6 +1157,7 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
/*
* Let the driver probe the device to detect the capabilities.
@ -1197,6 +1214,7 @@ void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
*/
cancel_work_sync(&rt2x00dev->intf_work);
cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
cancel_work_sync(&rt2x00dev->sleep_work);
if (rt2x00_is_usb(rt2x00dev)) {
del_timer_sync(&rt2x00dev->txstatus_timer);
cancel_work_sync(&rt2x00dev->rxdone_work);