From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 7 Jun 2015 13:53:35 +0200
Subject: [PATCH] ath9k: force rx_clear when disabling rx

This makes stopping Rx more reliable and should reduce the frequency of
Rx related DMA stop warnings. Don't use rx_clear in TX99 mode.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
---

--- a/drivers/net/wireless/ath/ath9k/mac.c
+++ b/drivers/net/wireless/ath/ath9k/mac.c
@@ -677,13 +677,18 @@ void ath9k_hw_startpcureceive(struct ath
 
 	ath9k_ani_reset(ah, is_scanning);
 
-	REG_CLR_BIT(ah, AR_DIAG_SW, (AR_DIAG_RX_DIS | AR_DIAG_RX_ABORT));
+	REG_CLR_BIT(ah, AR_DIAG_SW,
+		    AR_DIAG_RX_DIS | AR_DIAG_RX_ABORT | AR_DIAG_FORCE_RX_CLEAR);
 }
 EXPORT_SYMBOL(ath9k_hw_startpcureceive);
 
 void ath9k_hw_abortpcurecv(struct ath_hw *ah)
 {
-	REG_SET_BIT(ah, AR_DIAG_SW, AR_DIAG_RX_ABORT | AR_DIAG_RX_DIS);
+	u32 reg = AR_DIAG_RX_DIS | AR_DIAG_RX_ABORT;
+
+	if (!IS_ENABLED(CPTCFG_ATH9K_TX99))
+		reg |= AR_DIAG_FORCE_RX_CLEAR;
+	REG_SET_BIT(ah, AR_DIAG_SW, reg);
 
 	ath9k_hw_disable_mib_counters(ah);
 }