ath5k: fix suspend-related oops on rmmod
Based on a patch by Elias Oltmanns, we call ath5k_init in resume even
if we didn't previously open the device. Besides starting up the
device unnecessarily, this also causes an oops on rmmod because
mac80211 will not invoke ath5k_stop and softirqs are left running after
the module has been unloaded. Add a new state bit, ATH_STAT_STARTED,
to indicate that we have been started up.
Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index 9b95c40..0f1d6bd 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -340,9 +340,9 @@
}
/* Interrupt handling */
-static int ath5k_init(struct ath5k_softc *sc);
+static int ath5k_init(struct ath5k_softc *sc, bool is_resume);
static int ath5k_stop_locked(struct ath5k_softc *sc);
-static int ath5k_stop_hw(struct ath5k_softc *sc);
+static int ath5k_stop_hw(struct ath5k_softc *sc, bool is_suspend);
static irqreturn_t ath5k_intr(int irq, void *dev_id);
static void ath5k_tasklet_reset(unsigned long data);
@@ -646,7 +646,7 @@
ath5k_led_off(sc);
- ath5k_stop_hw(sc);
+ ath5k_stop_hw(sc, true);
free_irq(pdev->irq, sc);
pci_save_state(pdev);
@@ -683,7 +683,7 @@
goto err_no_irq;
}
- err = ath5k_init(sc);
+ err = ath5k_init(sc, true);
if (err)
goto err_irq;
ath5k_led_enable(sc);
@@ -2200,12 +2200,17 @@
\********************/
static int
-ath5k_init(struct ath5k_softc *sc)
+ath5k_init(struct ath5k_softc *sc, bool is_resume)
{
int ret;
mutex_lock(&sc->lock);
+ if (is_resume && !test_bit(ATH_STAT_STARTED, sc->status))
+ goto out_ok;
+
+ __clear_bit(ATH_STAT_STARTED, sc->status);
+
ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "mode %d\n", sc->opmode);
/*
@@ -2230,12 +2235,15 @@
if (ret)
goto done;
+ __set_bit(ATH_STAT_STARTED, sc->status);
+
/* Set ack to be sent at low bit-rates */
ath5k_hw_set_ack_bitrate_high(sc->ah, false);
mod_timer(&sc->calib_tim, round_jiffies(jiffies +
msecs_to_jiffies(ath5k_calinterval * 1000)));
+out_ok:
ret = 0;
done:
mmiowb();
@@ -2290,7 +2298,7 @@
* stop is preempted).
*/
static int
-ath5k_stop_hw(struct ath5k_softc *sc)
+ath5k_stop_hw(struct ath5k_softc *sc, bool is_suspend)
{
int ret;
@@ -2321,6 +2329,9 @@
}
}
ath5k_txbuf_free(sc, sc->bbuf);
+ if (!is_suspend)
+ __clear_bit(ATH_STAT_STARTED, sc->status);
+
mmiowb();
mutex_unlock(&sc->lock);
@@ -2718,12 +2729,12 @@
static int ath5k_start(struct ieee80211_hw *hw)
{
- return ath5k_init(hw->priv);
+ return ath5k_init(hw->priv, false);
}
static void ath5k_stop(struct ieee80211_hw *hw)
{
- ath5k_stop_hw(hw->priv);
+ ath5k_stop_hw(hw->priv, false);
}
static int ath5k_add_interface(struct ieee80211_hw *hw,