ath9k: Protect config() callback with a mutex

This should fix the timeout issues seen when using wpa_supplicant.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index e768be4669e7..94c526669a4d 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1324,6 +1324,7 @@ static int ath_init(u16 devid, struct ath_softc *sc)
                 printk(KERN_ERR "Unable to create debugfs files\n");
 
         spin_lock_init(&sc->sc_resetlock);
+        mutex_init(&sc->mutex);
         tasklet_init(&sc->intr_tq, ath9k_tasklet, (unsigned long)sc);
         tasklet_init(&sc->bcon_tasklet, ath9k_beacon_tasklet,
                      (unsigned long)sc);
@@ -2133,6 +2134,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
         struct ath_softc *sc = hw->priv;
         struct ieee80211_conf *conf = &hw->conf;
 
+        mutex_lock(&sc->mutex);
         if (changed & (IEEE80211_CONF_CHANGE_CHANNEL |
                        IEEE80211_CONF_CHANGE_HT)) {
                 struct ieee80211_channel *curchan = hw->conf.channel;
@@ -2145,6 +2147,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
                 if (pos == -1) {
                         DPRINTF(sc, ATH_DBG_FATAL, "Invalid channel: %d\n",
                                 curchan->center_freq);
+                        mutex_unlock(&sc->mutex);
                         return -EINVAL;
                 }
 
@@ -2165,6 +2168,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 
                 if (ath_set_channel(sc, &sc->sc_ah->ah_channels[pos]) < 0) {
                         DPRINTF(sc, ATH_DBG_FATAL, "Unable to set channel\n");
+                        mutex_unlock(&sc->mutex);
                         return -EINVAL;
                 }
 
@@ -2174,6 +2178,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
         if (changed & IEEE80211_CONF_CHANGE_POWER)
                 sc->sc_config.txpowlimit = 2 * conf->power_level;
 
+        mutex_unlock(&sc->mutex);
         return 0;
 }