From fc5c3230ae483b7cd10f32fe2ca37eeb04bb5270 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 10 Aug 2013 14:04:15 +0000 Subject: [PATCH] ath9k: fix an rx descriptor processing race condition Signed-off-by: Felix Fietkau Backport of r37746 SVN-Revision: 37747 --- .../patches/556-ath9k_fix_rx_race.patch | 82 +++++++++++++++++++ .../560-ath9k_tx_queueing_rework.patch | 12 +-- 2 files changed, 88 insertions(+), 6 deletions(-) create mode 100644 package/mac80211/patches/556-ath9k_fix_rx_race.patch diff --git a/package/mac80211/patches/556-ath9k_fix_rx_race.patch b/package/mac80211/patches/556-ath9k_fix_rx_race.patch new file mode 100644 index 0000000000..69030d27a3 --- /dev/null +++ b/package/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 + * +@@ -317,6 +313,7 @@ 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); diff --git a/package/mac80211/patches/560-ath9k_tx_queueing_rework.patch b/package/mac80211/patches/560-ath9k_tx_queueing_rework.patch index 814bca81a6..c5bcbbedfc 100644 --- a/package/mac80211/patches/560-ath9k_tx_queueing_rework.patch +++ b/package/mac80211/patches/560-ath9k_tx_queueing_rework.patch @@ -1,6 +1,6 @@ --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h -@@ -137,7 +137,8 @@ int ath_descdma_setup(struct ath_softc * +@@ -133,7 +133,8 @@ int ath_descdma_setup(struct ath_softc * #define ATH_AGGR_ENCRYPTDELIM 10 /* minimum h/w qdepth to be sustained to maximize aggregation */ #define ATH_AGGR_MIN_QDEPTH 2 @@ -10,7 +10,7 @@ #define IEEE80211_SEQ_SEQ_SHIFT 4 #define IEEE80211_SEQ_MAX 4096 -@@ -174,12 +175,6 @@ int ath_descdma_setup(struct ath_softc * +@@ -170,12 +171,6 @@ int ath_descdma_setup(struct ath_softc * #define ATH_TX_COMPLETE_POLL_INT 1000 @@ -23,7 +23,7 @@ #define ATH_TXFIFO_DEPTH 8 struct ath_txq { int mac80211_qnum; /* mac80211 queue number, -1 means not mac80211 Q */ -@@ -212,8 +207,9 @@ struct ath_frame_info { +@@ -208,8 +203,9 @@ struct ath_frame_info { int framelen; enum ath9k_key_type keytype; u8 keyix; @@ -34,7 +34,7 @@ }; struct ath_buf_state { -@@ -241,6 +237,7 @@ struct ath_buf { +@@ -237,6 +233,7 @@ struct ath_buf { struct ath_atx_tid { struct list_head list; struct sk_buff_head buf_q; @@ -42,7 +42,7 @@ struct ath_node *an; struct ath_atx_ac *ac; unsigned long tx_buf[BITS_TO_LONGS(ATH_TID_MAX_BUFS)]; -@@ -268,6 +265,7 @@ struct ath_node { +@@ -264,6 +261,7 @@ struct ath_node { u8 mpdudensity; bool sleeping; @@ -50,7 +50,7 @@ #if defined(CPTCFG_MAC80211_DEBUGFS) && defined(CPTCFG_ATH9K_DEBUGFS) struct dentry *node_stat; -@@ -367,6 +365,7 @@ void ath9k_release_buffered_frames(struc +@@ -364,6 +362,7 @@ void ath9k_release_buffered_frames(struc /********/ struct ath_vif { -- 2.30.2