ath6kl: Recover from "wmi ctrl ep is full" condition

In some error conditions, fw pauses HTC pipes which would
result in control endpoint full condition. When we hit this
case, most of the time the device will be unusable. Re-initialize
the target to recover from this situation.
Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath6kl/core.h

@@ -660,6 +660,7 @@ enum ath6kl_state {
 enum ath6kl_fw_err {
 	ATH6KL_FW_ASSERT,
 	ATH6KL_FW_HB_RESP_FAILURE,
+	ATH6KL_FW_EP_FULL,
 };
 
 struct ath6kl {

drivers/net/wireless/ath/ath6kl/recovery.c

@@ -30,6 +30,8 @@ static void ath6kl_recovery_work(struct work_struct *work)
 	ath6kl_init_hw_restart(ar);
 
 	ar->state = ATH6KL_STATE_ON;
+	clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
+
 	ar->fw_recovery.err_reason = 0;
 
 	if (ar->fw_recovery.enable)

drivers/net/wireless/ath/ath6kl/txrx.c

@@ -594,6 +594,7 @@ enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
 		 */
 		set_bit(WMI_CTRL_EP_FULL, &ar->flag);
 		ath6kl_err("wmi ctrl ep is full\n");
+		ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL);
 		return action;
 	}