ath9k: do not link receive buffers during flush
authorFelix Fietkau <nbd@openwrt.org>
Wed, 9 Jan 2013 15:16:52 +0000 (16:16 +0100)
committerJohn W. Linville <linville@tuxdriver.com>
Fri, 11 Jan 2013 19:12:01 +0000 (14:12 -0500)
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>
drivers/net/wireless/ath/ath9k/recv.c

index d4df98a..01c3ba4 100644 (file)
@@ -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);