wl12xx: implement SW Tx watchdog

Track freed FW blocks during Tx. If no blocks were freed during a
predefined timeout, initiate a HW recovery. This helps in situations
when the FW watchdog fails.

Don't trigger recovery during activities that can temporarily stop
Tx. This includes:
- scanning
- buffering packets for sleeping stations (AP role)
- ROC on any role

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/scan.c b/drivers/net/wireless/wl12xx/scan.c
index e43a6b2c1d91..fcba055ef196 100644
--- a/drivers/net/wireless/wl12xx/scan.c
+++ b/drivers/net/wireless/wl12xx/scan.c
@@ -55,6 +55,12 @@ void wl1271_scan_complete_work(struct work_struct *work)
         vif = wl->scan_vif;
         wlvif = wl12xx_vif_to_data(vif);
 
+        /*
+         * Rearm the tx watchdog just before idling scan. This
+         * prevents just-finished scans from triggering the watchdog
+         */
+        wl12xx_rearm_tx_watchdog_locked(wl);
+
         wl->scan.state = WL1271_SCAN_STATE_IDLE;
         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
         wl->scan.req = NULL;