[lkml]   [2010]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[patch 071/123] ath9k: fix beacon timer restart after a card reset
2.6.33-stable review patch.  If anyone has any objections, please let me know.


From: Felix Fietkau <>

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

Signed-off-by: Felix Fietkau <>
Signed-off-by: John W. Linville <>
Signed-off-by: Greg Kroah-Hartman <>

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
@@ -525,16 +525,13 @@ 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;
+ if (sc->sc_flags & SC_OP_TSF_RESET)

* In AP mode we enable the beacon timers and SWBA interrupts to

 \ /
  Last update: 2010-03-13 01:23    [W:0.343 / U:6.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site