ath9k: fix dma mapping leak of rx buffer upon rmmod

We were claiming DMA buffers on the RX tasklet but never
upon a simple module removal.

Cc: stable@kernel.org
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index 917bac7af6f6..71cb18d6757d 100644
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -344,8 +344,13 @@ void ath_rx_cleanup(struct ath_softc *sc)
 
         list_for_each_entry(bf, &sc->rx.rxbuf, list) {
                 skb = bf->bf_mpdu;
-                if (skb)
+                if (skb) {
+                        dma_unmap_single(sc->dev,
+                                         bf->bf_buf_addr,
+                                         sc->rx.bufsize,
+                                         DMA_FROM_DEVICE);
                         dev_kfree_skb(skb);
+                }
         }
 
         if (sc->rx.rxdma.dd_desc_len != 0)