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Subject[ 081/128] ath9k: do not link receive buffers during flush
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felix Fietkau <nbd@openwrt.org>

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>
---
drivers/net/wireless/ath/ath9k/recv.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index d4df98a..01c3ba4 100644
--- 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);




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