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wlcore: Disable interrupts while recovering

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In case a recovery is initiated, the FW can no longer be trusted, and
the driver should not handle any new FW events.

Disable the interrupt handler when a recovery is scheduled and balance
it back in the op_stop callback.

Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
This commit is contained in:
Ido Yariv 2012-05-21 01:10:11 +03:00 committed by Luciano Coelho
parent 645865fc37
commit b666bb7f2f
3 changed files with 22 additions and 6 deletions
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6
drivers/net/wireless/ti/wlcore/io.c
View file

@ -48,6 +48,12 @@ void wlcore_disable_interrupts(struct wl1271 *wl)
}
EXPORT_SYMBOL_GPL(wlcore_disable_interrupts);
void wlcore_disable_interrupts_nosync(struct wl1271 *wl)
{
disable_irq_nosync(wl->irq);
}
EXPORT_SYMBOL_GPL(wlcore_disable_interrupts_nosync);
void wlcore_enable_interrupts(struct wl1271 *wl)
{
enable_irq(wl->irq);

1
drivers/net/wireless/ti/wlcore/io.h
View file

@ -45,6 +45,7 @@
struct wl1271;
void wlcore_disable_interrupts(struct wl1271 *wl);
void wlcore_disable_interrupts_nosync(struct wl1271 *wl);
void wlcore_enable_interrupts(struct wl1271 *wl);
void wl1271_io_reset(struct wl1271 *wl);

21
drivers/net/wireless/ti/wlcore/main.c
View file

@ -743,8 +743,11 @@ out:
void wl12xx_queue_recovery_work(struct wl1271 *wl)
{
if (!test_bit(WL1271_FLAG_RECOVERY_IN_PROGRESS, &wl->flags))
/* Avoid a recursive recovery */
if (!test_and_set_bit(WL1271_FLAG_RECOVERY_IN_PROGRESS, &wl->flags)) {
wlcore_disable_interrupts_nosync(wl);
ieee80211_queue_work(wl->hw, &wl->recovery_work);
}
}
size_t wl12xx_copy_fwlog(struct wl1271 *wl, u8 *memblock, size_t maxlen)
@ -848,9 +851,6 @@ static void wl1271_recovery_work(struct work_struct *work)
if (wl->state != WL1271_STATE_ON || wl->plt)
goto out_unlock;
/* Avoid a recursive recovery */
set_bit(WL1271_FLAG_RECOVERY_IN_PROGRESS, &wl->flags);
wl12xx_read_fwlog_panic(wl);
/* change partitions momentarily so we can read the FW pc */
@ -902,8 +902,6 @@ static void wl1271_recovery_work(struct work_struct *work)
mutex_unlock(&wl->mutex);
wl1271_op_stop(wl->hw);
clear_bit(WL1271_FLAG_RECOVERY_IN_PROGRESS, &wl->flags);
ieee80211_restart_hw(wl->hw);
/*
@ -1706,6 +1704,10 @@ static void wl1271_op_stop(struct ieee80211_hw *hw)
wlcore_disable_interrupts(wl);
mutex_lock(&wl->mutex);
if (wl->state == WL1271_STATE_OFF) {
if (test_and_clear_bit(WL1271_FLAG_RECOVERY_IN_PROGRESS,
&wl->flags))
wlcore_enable_interrupts(wl);
mutex_unlock(&wl->mutex);
/*
@ -1737,6 +1739,13 @@ static void wl1271_op_stop(struct ieee80211_hw *hw)
mutex_lock(&wl->mutex);
wl1271_power_off(wl);
/*
* In case a recovery was scheduled, interrupts were disabled to avoid
* an interrupt storm. Now that the power is down, it is safe to
* re-enable interrupts to balance the disable depth
*/
if (test_and_clear_bit(WL1271_FLAG_RECOVERY_IN_PROGRESS, &wl->flags))
wlcore_enable_interrupts(wl);
wl->band = IEEE80211_BAND_2GHZ;