From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 13 Nov 2014 18:27:47 +0100
Subject: [PATCH] ath9k: prevent early IRQs from accessing hardware

IRQs are suppressed if ah == NULL and ATH_OP_INVALID being set in
common->op_flags. Close a short time window between those two.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---

--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -513,10 +513,14 @@ static int ath9k_init_softc(u16 devid, s
 	ah->reg_ops.read = ath9k_ioread32;
 	ah->reg_ops.write = ath9k_iowrite32;
 	ah->reg_ops.rmw = ath9k_reg_rmw;
-	sc->sc_ah = ah;
 	pCap = &ah->caps;
 
 	common = ath9k_hw_common(ah);
+
+	/* Will be cleared in ath9k_start() */
+	set_bit(ATH_OP_INVALID, &common->op_flags);
+
+	sc->sc_ah = ah;
 	sc->dfs_detector = dfs_pattern_detector_init(common, NL80211_DFS_UNSET);
 	sc->tx99_power = MAX_RATE_POWER + 1;
 	init_waitqueue_head(&sc->tx_wait);
@@ -876,9 +880,6 @@ int ath9k_init_device(u16 devid, struct 
 	common = ath9k_hw_common(ah);
 	ath9k_set_hw_capab(sc, hw);
 
-	/* Will be cleared in ath9k_start() */
-	set_bit(ATH_OP_INVALID, &common->op_flags);
-
 	/* Initialize regulatory */
 	error = ath_regd_init(&common->regulatory, sc->hw->wiphy,
 			      ath9k_reg_notifier);