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    Subject[PATCH] [81/106] ath9k: fix a chip wakeup related crash in ath9k_start
    Date
    2.6.35-longterm review patch.  If anyone has any objections, please let me know.

    ------------------
    From: Felix Fietkau <nbd@openwrt.org>

    [ upstream commit f62d816fc4324afbb7cf90110c70b6a14139b225 ]

    When the chip is still asleep when ath9k_start is called,
    ath9k_hw_configpcipowersave can trigger a data bus error.

    Signed-off-by: Felix Fietkau <nbd@openwrt.org>
    Signed-off-by: Andi Kleen <ak@linux.intel.com>
    Cc: stable@kernel.org
    Signed-off-by: John W. Linville <linville@tuxdriver.com>

    Index: linux-2.6.35.y/drivers/net/wireless/ath/ath9k/main.c
    ===================================================================
    --- linux-2.6.35.y.orig/drivers/net/wireless/ath/ath9k/main.c
    +++ linux-2.6.35.y/drivers/net/wireless/ath/ath9k/main.c
    @@ -1124,6 +1124,8 @@ static int ath9k_start(struct ieee80211_
    "Starting driver with initial channel: %d MHz\n",
    curchan->center_freq);

    + ath9k_ps_wakeup(sc);
    +
    mutex_lock(&sc->mutex);

    if (ath9k_wiphy_started(sc)) {
    @@ -1238,6 +1240,8 @@ static int ath9k_start(struct ieee80211_
    mutex_unlock:
    mutex_unlock(&sc->mutex);

    + ath9k_ps_restore(sc);
    +
    return r;
    }


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