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>

diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index 1a6e72f..c8c658b 100644 (file)
--- 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 */