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authorFelix Fietkau <nbd@openwrt.org>2013-08-10 14:00:33 +0000
committerFelix Fietkau <nbd@openwrt.org>2013-08-10 14:00:33 +0000
commitfd586c027563a7aa8fcbf45f7b1885d8bd7276cd (patch)
tree8cbb16f205143e32c88de5fd18dbdeb23d75bdbf /package
parent007bd290eaf68a8b8d31f0a3604b07fba96c0f55 (diff)
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ath9k: fix an rx descriptor processing race condition
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 37746
Diffstat (limited to 'package')
-rw-r--r--package/kernel/mac80211/patches/556-ath9k_fix_rx_race.patch82
1 files changed, 82 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/556-ath9k_fix_rx_race.patch b/package/kernel/mac80211/patches/556-ath9k_fix_rx_race.patch
new file mode 100644
index 0000000000..3e5347dfb3
--- /dev/null
+++ b/package/kernel/mac80211/patches/556-ath9k_fix_rx_race.patch
@@ -0,0 +1,82 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -79,10 +79,6 @@ struct ath_config {
+ sizeof(struct ath_buf_state)); \
+ } while (0)
+
+-#define ATH_RXBUF_RESET(_bf) do { \
+- (_bf)->bf_stale = false; \
+- } while (0)
+-
+ /**
+ * enum buffer_type - Buffer type flags
+ *
+@@ -315,6 +311,7 @@ struct ath_rx {
+ struct ath_descdma rxdma;
+ struct ath_rx_edma rx_edma[ATH9K_RX_QUEUE_MAX];
+
++ struct ath_buf *buf_hold;
+ struct sk_buff *frag;
+
+ u32 ampdu_ref;
+--- a/drivers/net/wireless/ath/ath9k/recv.c
++++ b/drivers/net/wireless/ath/ath9k/recv.c
+@@ -42,8 +42,6 @@ static void ath_rx_buf_link(struct ath_s
+ struct ath_desc *ds;
+ struct sk_buff *skb;
+
+- ATH_RXBUF_RESET(bf);
+-
+ ds = bf->bf_desc;
+ ds->ds_link = 0; /* link to null */
+ ds->ds_data = bf->bf_buf_addr;
+@@ -70,6 +68,14 @@ static void ath_rx_buf_link(struct ath_s
+ sc->rx.rxlink = &ds->ds_link;
+ }
+
++static void ath_rx_buf_relink(struct ath_softc *sc, struct ath_buf *bf)
++{
++ if (sc->rx.buf_hold)
++ ath_rx_buf_link(sc, sc->rx.buf_hold);
++
++ sc->rx.buf_hold = bf;
++}
++
+ static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
+ {
+ /* XXX block beacon interrupts */
+@@ -117,7 +123,6 @@ static bool ath_rx_edma_buf_link(struct
+
+ skb = bf->bf_mpdu;
+
+- ATH_RXBUF_RESET(bf);
+ memset(skb->data, 0, ah->caps.rx_status_len);
+ dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
+ ah->caps.rx_status_len, DMA_TO_DEVICE);
+@@ -432,6 +437,7 @@ int ath_startrecv(struct ath_softc *sc)
+ if (list_empty(&sc->rx.rxbuf))
+ goto start_recv;
+
++ sc->rx.buf_hold = NULL;
+ sc->rx.rxlink = NULL;
+ list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
+ ath_rx_buf_link(sc, bf);
+@@ -677,6 +683,9 @@ static struct ath_buf *ath_get_next_rx_b
+ }
+
+ bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
++ if (bf == sc->rx.buf_hold)
++ return NULL;
++
+ ds = bf->bf_desc;
+
+ /*
+@@ -1391,7 +1400,7 @@ requeue:
+ if (edma) {
+ ath_rx_edma_buf_link(sc, qtype);
+ } else {
+- ath_rx_buf_link(sc, bf);
++ ath_rx_buf_relink(sc, bf);
+ ath9k_hw_rxena(ah);
+ }
+ } while (1);