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ath9k: fix a DMA related race condition at hw reset time

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24261 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2010-12-05 16:26:38 +00:00
parent e82b1d80fc
commit 342bbc147b
1 changed files with 74 additions and 0 deletions
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74
package/mac80211/patches/520-ath9k_reset_fix.patch Normal file
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@ -0,0 +1,74 @@
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1172,7 +1172,7 @@ void ath_draintxq(struct ath_softc *sc,
}
}
-void ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
+bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
@@ -1180,7 +1180,7 @@ void ath_drain_all_txq(struct ath_softc
int i, npend = 0;
if (sc->sc_flags & SC_OP_INVALID)
- return;
+ return true;
/* Stop beacon queue */
ath9k_hw_stoptxdma(sc->sc_ah, sc->beacon.beaconq);
@@ -1194,23 +1194,15 @@ void ath_drain_all_txq(struct ath_softc
}
}
- if (npend) {
- int r;
-
- ath_print(common, ATH_DBG_FATAL,
- "Failed to stop TX DMA. Resetting hardware!\n");
-
- r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false);
- if (r)
- ath_print(common, ATH_DBG_FATAL,
- "Unable to reset hardware; reset status %d\n",
- r);
- }
+ if (npend)
+ ath_print(common, ATH_DBG_FATAL, "Failed to stop TX DMA!\n");
for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
if (ATH_TXQ_SETUP(sc, i))
ath_draintxq(sc, &sc->tx.txq[i], retry_tx);
}
+
+ return !npend;
}
void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -311,7 +311,7 @@ void ath_rx_cleanup(struct ath_softc *sc
int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp);
struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype);
void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq);
-void ath_drain_all_txq(struct ath_softc *sc, bool retry_tx);
+bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx);
void ath_draintxq(struct ath_softc *sc,
struct ath_txq *txq, bool retry_tx);
void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an);
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -246,9 +246,10 @@ int ath_set_channel(struct ath_softc *sc
* the relevant bits of the h/w.
*/
ath9k_hw_disable_interrupts(ah);
- ath_drain_all_txq(sc, false);
+ stopped = ath_drain_all_txq(sc, false);
- stopped = ath_stoprecv(sc);
+ if (!ath_stoprecv(sc))
+ stopped = false;
/* XXX: do not flush receive queue here. We don't want
* to flush data frames already in queue because of