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ath9k: fix an rx path race condition that might be the cause of the "…

…ath: DMA failed to stop in 10 ms" logspam as well as various connection stability issues

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@28202 3c298f89-4303-0410-b956-a3cf2f4a3e73
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nbd
nbd committed Sep 9, 2011
1 parent 1a1cc0d commit 749a54b34cf93b0e497131c2dd47438832a92c35
Showing with 34 additions and 0 deletions.
  1. +34 −0 package/mac80211/patches/586-ath9k_fix_rx_flush.patch
@@ -0,0 +1,34 @@
+--- a/drivers/net/wireless/ath/ath9k/recv.c
++++ b/drivers/net/wireless/ath/ath9k/recv.c
+@@ -1845,7 +1845,7 @@ int ath_rx_tasklet(struct ath_softc *sc,
+ * If we're asked to flush receive queue, directly
+ * chain it back at the queue without processing it.
+ */
+- if (flush)
++ if (sc->sc_flags & SC_OP_RXFLUSH)
+ goto requeue_drop_frag;
+
+ retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
+@@ -1973,7 +1973,8 @@ requeue:
+ } else {
+ list_move_tail(&bf->list, &sc->rx.rxbuf);
+ ath_rx_buf_link(sc, bf);
+- ath9k_hw_rxena(ah);
++ if (!flush)
++ ath9k_hw_rxena(ah);
+ }
+ } while (1);
+
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -246,8 +246,8 @@ static bool ath_prepare_reset(struct ath
+
+ if (!flush) {
+ if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
+- ath_rx_tasklet(sc, 0, true);
+- ath_rx_tasklet(sc, 0, false);
++ ath_rx_tasklet(sc, 1, true);
++ ath_rx_tasklet(sc, 1, false);
+ } else {
+ ath_flushrecv(sc);
+ }

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