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ath5k: use rx hw descriptor pointer for self-linked check

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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>
This commit is contained in:
Bob Copeland
2009-04-15 07:57:35 -04:00
committed by John W. Linville
parent 46802a4f07
commit c57ca81576
3 changed files with 4 additions and 23 deletions
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24
drivers/net/wireless/ath/ath5k/base.c
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@@ -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))