From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 9 Jan 2013 15:16:52 +0000 (+0100)
Subject: ath9k: do not link receive buffers during flush
X-Git-Tag: v3.2.38~48
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8e75bb199071d3c86cd04ecb98b35e5b65d39594;p=karo-tx-linux.git

ath9k: do not link receive buffers during flush

commit a3dc48e82bb146ef11cf75676c8410c1df29b0c4 upstream.

On AR9300 the rx FIFO needs to be empty during reset to ensure that no
further DMA activity is generated, otherwise it might lead to memory
corruption issues.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index b4cbc82c2c77..d171a7242e4a 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -786,6 +786,7 @@ static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
 			return NULL;
 	}
 
+	list_del(&bf->list);
 	if (!bf->bf_mpdu)
 		return bf;
 
@@ -1966,14 +1967,15 @@ requeue_drop_frag:
 			sc->rx.frag = NULL;
 		}
 requeue:
+		list_add_tail(&bf->list, &sc->rx.rxbuf);
+		if (flush)
+			continue;
+
 		if (edma) {
-			list_add_tail(&bf->list, &sc->rx.rxbuf);
 			ath_rx_edma_buf_link(sc, qtype);
 		} else {
-			list_move_tail(&bf->list, &sc->rx.rxbuf);
 			ath_rx_buf_link(sc, bf);
-			if (!flush)
-				ath9k_hw_rxena(ah);
+			ath9k_hw_rxena(ah);
 		}
 	} while (1);