ath9k: do not link receive buffers during flush

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.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index d4df98a..01c3ba4 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -744,6 +744,7 @@ 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;
 
@@ -1254,14 +1255,15 @@ 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);