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Subject[patch 27/27] ath5k: fix suspend-related oops on rmmod
2.6.27-stable review patch.  If anyone has any objections, please let us 
know.

------------------
From: Bob Copeland <me@bobcopeland.com>
commit 8bdd5b9c6bd53add260756b6673a0545fbdbba21 upstream

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>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/wireless/ath5k/base.c | 28 ++++++++++++++++++++--------
drivers/net/wireless/ath5k/base.h | 3 ++-
2 files changed, 22 insertions(+), 9 deletions(-)
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -294,9 +294,9 @@ static inline u64 ath5k_extend_tsf(struc
}

/* 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);

@@ -584,7 +584,7 @@ ath5k_pci_suspend(struct pci_dev *pdev,

ath5k_led_off(sc);

- ath5k_stop_hw(sc);
+ ath5k_stop_hw(sc, true);

free_irq(pdev->irq, sc);
pci_save_state(pdev);
@@ -621,7 +621,7 @@ ath5k_pci_resume(struct pci_dev *pdev)
goto err_no_irq;
}

- err = ath5k_init(sc);
+ err = ath5k_init(sc, true);
if (err)
goto err_irq;
ath5k_led_enable(sc);
@@ -2197,12 +2197,17 @@ ath5k_beacon_config(struct ath5k_softc *
\********************/

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);

/*
@@ -2250,12 +2255,16 @@ ath5k_init(struct ath5k_softc *sc)
AR5K_INT_MIB;

ath5k_hw_set_intr(sc->ah, sc->imask);
+
+ __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();
@@ -2310,7 +2319,7 @@ ath5k_stop_locked(struct ath5k_softc *sc
* stop is preempted).
*/
static int
-ath5k_stop_hw(struct ath5k_softc *sc)
+ath5k_stop_hw(struct ath5k_softc *sc, bool is_suspend)
{
int ret;

@@ -2341,6 +2350,9 @@ ath5k_stop_hw(struct ath5k_softc *sc)
}
}
ath5k_txbuf_free(sc, sc->bbuf);
+ if (!is_suspend)
+ __clear_bit(ATH_STAT_STARTED, sc->status);
+
mmiowb();
mutex_unlock(&sc->lock);

@@ -2719,12 +2731,12 @@ err:

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,
--- a/drivers/net/wireless/ath5k/base.h
+++ b/drivers/net/wireless/ath5k/base.h
@@ -132,11 +132,12 @@ struct ath5k_softc {
size_t desc_len; /* size of TX/RX descriptors */
u16 cachelsz; /* cache line size */

- DECLARE_BITMAP(status, 4);
+ DECLARE_BITMAP(status, 5);
#define ATH_STAT_INVALID 0 /* disable hardware accesses */
#define ATH_STAT_MRRETRY 1 /* multi-rate retry support */
#define ATH_STAT_PROMISC 2
#define ATH_STAT_LEDSOFT 3 /* enable LED gpio status */
+#define ATH_STAT_STARTED 4 /* opened & irqs enabled */

unsigned int filter_flags; /* HW flags, AR5K_RX_FILTER_* */
unsigned int curmode; /* current phy mode */
--
--
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