[098/145] ath9k: fix beacon timer restart after a card reset

[Greg KH]

2.6.32-stable review patch.  If anyone has any objections, please let me know.

----------------
From: Felix Fietkau <nbd@xxxxxxxxxxx>

commit d8728ee919282c7b01b65cd479ec1e2a9c5d3ba8 upstream.

In AP mode, ath_beacon_config_ap only restarts the timer if a TSF
restart is requested. Apparently this was added, because this function
unconditionally sets the flag for TSF reset.

The problem with this is, that ath9k_hw_reset() clobbers the timer
registers (specified in the initvals), thus effectively disabling the
SWBA interrupt whenever a card reset without TSF reset is issued
(happens in a few places in the code).

This patch fixes ath_beacon_config_ap to only issue the TSF reset flag
when necessary, but reinitialize the timer unconditionally. Tests show,
that this is enough to keep the SWBA interrupt going after a call to
ath_reset()

Signed-off-by: Felix Fietkau <nbd@xxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/wireless/ath/ath9k/beacon.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -512,16 +512,13 @@ static void ath_beacon_config_ap(struct
 {
 	u32 nexttbtt, intval;
 
-	/* Configure the timers only when the TSF has to be reset */
-
-	if (!(sc->sc_flags & SC_OP_TSF_RESET))
-		return;
-
 	/* NB: the beacon interval is kept internally in TU's */
 	intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
 	intval /= ATH_BCBUF;    /* for staggered beacons */
 	nexttbtt = intval;
-	intval |= ATH9K_BEACON_RESET_TSF;
+
+	if (sc->sc_flags & SC_OP_TSF_RESET)
+		intval |= ATH9K_BEACON_RESET_TSF;
 
 	/*
 	 * In AP mode we enable the beacon timers and SWBA interrupts to


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