diff options
| author | Bob Copeland <me@bobcopeland.com> | 2009-04-15 07:57:36 -0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-04-22 16:57:15 -0400 |
| commit | 26925042b6b105995ee54c6015e95f0caf9632d6 (patch) | |
| tree | 9305c7204ac3aa0bc081b67d36d6ad8a66303c0e | |
| parent | c57ca81576e7ca0369ea52c9ac5f35d0f6ca1270 (diff) | |
ath5k: manipulate rxlink and descriptor address under rxbuf lock
Grabbing an ath5k_buf then dropping the lock is racy because the
referenced descriptor can be obtained in another thread and released
before the buffer is handed to the hardware. Likewise, manipulating
sc->rxlink without the lock can lead to having multiple self-linked
hardware descriptors.
Changes-licensed-under: 3-Clause-BSD
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/net/wireless/ath/ath5k/base.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c index 1a6e72fe7be..c8c658bfcf9 100644 --- a/drivers/net/wireless/ath/ath5k/base.c +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -1618,9 +1618,8 @@ ath5k_rx_start(struct ath5k_softc *sc) ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "cachelsz %u rxbufsize %u\n", sc->cachelsz, sc->rxbufsize); - sc->rxlink = NULL; - spin_lock_bh(&sc->rxbuflock); + sc->rxlink = NULL; list_for_each_entry(bf, &sc->rxbuf, list) { ret = ath5k_rxbuf_setup(sc, bf); if (ret != 0) { @@ -1629,9 +1628,9 @@ ath5k_rx_start(struct ath5k_softc *sc) } } bf = list_first_entry(&sc->rxbuf, struct ath5k_buf, list); + ath5k_hw_set_rxdp(ah, bf->daddr); spin_unlock_bh(&sc->rxbuflock); - ath5k_hw_set_rxdp(ah, bf->daddr); ath5k_hw_start_rx_dma(ah); /* enable recv descriptors */ ath5k_mode_setup(sc); /* set filters, etc. */ ath5k_hw_start_rx_pcu(ah); /* re-enable PCU/DMA engine */ |