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    Subject[73/73] ath9k: Fix kernel panic in AR2427 in AP mode
    3.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------
    Content-Length: 2620
    Lines: 69

    From: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>

    commit b25bfda38236f349cde0d1b28952f4eea2148d3f upstream.

    don't do aggregation related stuff for 'AP mode client power save
    handling' if aggregation is not enabled in the driver, otherwise it
    will lead to panic because those data structures won't be never
    intialized in 'ath_tx_node_init' if aggregation is disabled

    EIP is at ath_tx_aggr_wakeup+0x37/0x80 [ath9k]
    EAX: e8c09a20 EBX: f2a304e8 ECX: 00000001 EDX: 00000000
    ESI: e8c085e0 EDI: f2a304ac EBP: f40e1ca4 ESP: f40e1c8c
    DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
    Process swapper/1 (pid: 0, ti=f40e0000 task=f408e860
    task.ti=f40dc000)
    Stack:
    0001e966 e8c09a20 00000000 f2a304ac e8c085e0 f2a304ac
    f40e1cb0 f8186741
    f8186700 f40e1d2c f922988d f2a304ac 00000202 00000001
    c0b4ba43 00000000
    0000000f e8eb75c0 e8c085e0 205b0001 34383220 f2a304ac
    f2a30000 00010020
    Call Trace:
    [<f8186741>] ath9k_sta_notify+0x41/0x50 [ath9k]
    [<f8186700>] ? ath9k_get_survey+0x110/0x110 [ath9k]
    [<f922988d>] ieee80211_sta_ps_deliver_wakeup+0x9d/0x350
    [mac80211]
    [<c018dc75>] ? __module_address+0x95/0xb0
    [<f92465b3>] ap_sta_ps_end+0x63/0xa0 [mac80211]
    [<f9246746>] ieee80211_rx_h_sta_process+0x156/0x2b0
    [mac80211]
    [<f9247d1e>] ieee80211_rx_handlers+0xce/0x510 [mac80211]
    [<c018440b>] ? trace_hardirqs_on+0xb/0x10
    [<c056936e>] ? skb_queue_tail+0x3e/0x50
    [<f9248271>] ieee80211_prepare_and_rx_handle+0x111/0x750
    [mac80211]
    [<f9248bf9>] ieee80211_rx+0x349/0xb20 [mac80211]
    [<f9248949>] ? ieee80211_rx+0x99/0xb20 [mac80211]
    [<f818b0b8>] ath_rx_tasklet+0x818/0x1d00 [ath9k]
    [<f8187a75>] ? ath9k_tasklet+0x35/0x1c0 [ath9k]
    [<f8187a75>] ? ath9k_tasklet+0x35/0x1c0 [ath9k]
    [<f8187b33>] ath9k_tasklet+0xf3/0x1c0 [ath9k]
    [<c0151b7e>] tasklet_action+0xbe/0x180

    Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com>
    Cc: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
    Reported-by: Ashwin Mendonca <ashwinloyal@gmail.com>
    Tested-by: Ashwin Mendonca <ashwinloyal@gmail.com>
    Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
    Signed-off-by: John W. Linville <linville@tuxdriver.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/net/wireless/ath/ath9k/main.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/drivers/net/wireless/ath/ath9k/main.c
    +++ b/drivers/net/wireless/ath/ath9k/main.c
    @@ -1828,6 +1828,9 @@ static void ath9k_sta_notify(struct ieee
    struct ath_softc *sc = hw->priv;
    struct ath_node *an = (struct ath_node *) sta->drv_priv;

    + if (!(sc->sc_flags & SC_OP_TXAGGR))
    + return;
    +
    switch (cmd) {
    case STA_NOTIFY_SLEEP:
    an->sleeping = true;



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