diff options
| author | Bob Copeland <me@bobcopeland.com> | 2009-04-15 07:57:35 -0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-04-22 16:57:14 -0400 |
| commit | c57ca81576e7ca0369ea52c9ac5f35d0f6ca1270 (patch) | |
| tree | c121d33c69a2eccf0658c7f7953d6eb9435c8d44 /drivers/net/wireless/ath | |
| parent | 46802a4f07cd2367d584bb1a2e6998d22d4d4f3a (diff) | |
| download | linux-c57ca81576e7ca0369ea52c9ac5f35d0f6ca1270.tar.gz | |
ath5k: use rx hw descriptor pointer for self-linked check
This patch simplifies the code used to detect when the self-linked DMA buffer is still in use by hardware, by checking the hardware's rxdp register instead of looking at the software buffer list. Signed-off-by: Bob Copeland <me@bobcopeland.com> Acked-by: Nick Kossifidis <mickflemm@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath')
| -rw-r--r-- | drivers/net/wireless/ath/ath5k/base.c | 24 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/ath5k/base.h | 1 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/ath5k/dma.c | 2 |
3 files changed, 4 insertions, 23 deletions
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c index 3bde18f91450..1a6e72fe7be9 100644 --- a/drivers/net/wireless/ath/ath5k/base.c +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -1780,7 +1780,7 @@ ath5k_tasklet_rx(unsigned long data) struct sk_buff *skb, *next_skb; dma_addr_t next_skb_addr; struct ath5k_softc *sc = (void *)data; - struct ath5k_buf *bf, *bf_last; + struct ath5k_buf *bf; struct ath5k_desc *ds; int ret; int hdrlen; @@ -1791,7 +1791,6 @@ ath5k_tasklet_rx(unsigned long data) ATH5K_WARN(sc, "empty rx buf pool\n"); goto unlock; } - bf_last = list_entry(sc->rxbuf.prev, struct ath5k_buf, list); do { rxs.flag = 0; @@ -1800,24 +1799,9 @@ ath5k_tasklet_rx(unsigned long data) skb = bf->skb; ds = bf->desc; - /* - * last buffer must not be freed to ensure proper hardware - * function. When the hardware finishes also a packet next to - * it, we are sure, it doesn't use it anymore and we can go on. - */ - if (bf_last == bf) - bf->flags |= 1; - if (bf->flags) { - struct ath5k_buf *bf_next = list_entry(bf->list.next, - struct ath5k_buf, list); - ret = sc->ah->ah_proc_rx_desc(sc->ah, bf_next->desc, - &rs); - if (ret) - break; - bf->flags &= ~1; - /* skip the overwritten one (even status is martian) */ - goto next; - } + /* bail if HW is still using self-linked descriptor */ + if (ath5k_hw_get_rxdp(sc->ah) == bf->daddr) + break; ret = sc->ah->ah_proc_rx_desc(sc->ah, ds, &rs); if (unlikely(ret == -EINPROGRESS)) diff --git a/drivers/net/wireless/ath/ath5k/base.h b/drivers/net/wireless/ath/ath5k/base.h index 822956114cd7..852b2c189fd8 100644 --- a/drivers/net/wireless/ath/ath5k/base.h +++ b/drivers/net/wireless/ath/ath5k/base.h @@ -56,7 +56,6 @@ struct ath5k_buf { struct list_head list; - unsigned int flags; /* rx descriptor flags */ struct ath5k_desc *desc; /* virtual addr of desc */ dma_addr_t daddr; /* physical addr of desc */ struct sk_buff *skb; /* skbuff for buf */ diff --git a/drivers/net/wireless/ath/ath5k/dma.c b/drivers/net/wireless/ath/ath5k/dma.c index b65b4feb2d28..941b51130a6f 100644 --- a/drivers/net/wireless/ath/ath5k/dma.c +++ b/drivers/net/wireless/ath/ath5k/dma.c @@ -80,8 +80,6 @@ int ath5k_hw_stop_rx_dma(struct ath5k_hw *ah) * ath5k_hw_get_rxdp - Get RX Descriptor's address * * @ah: The &struct ath5k_hw - * - * XXX: Is RXDP read and clear ? */ u32 ath5k_hw_get_rxdp(struct ath5k_hw *ah) { |