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fix a some txq races (merge from madwifi-trunk)

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10895 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2008-04-20 22:01:27 +00:00
parent deb3135ef2
commit 29e18fb10f
1 changed files with 38 additions and 0 deletions
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38
package/madwifi/patches/360-txqueue_races.patch Normal file
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@ -0,0 +1,38 @@
Merged from madwifi trunk r3551, r3552
Index: madwifi-trunk-r3314/ath/if_ath.c
===================================================================
--- madwifi-trunk-r3314.orig/ath/if_ath.c 2008-04-20 23:18:52.000000000 +0200
+++ madwifi-trunk-r3314/ath/if_ath.c 2008-04-20 23:20:36.000000000 +0200
@@ -8245,6 +8245,17 @@
goto bf_fail;
}
+ /* We make sure we don't remove the TX descriptor on
+ * which the HW is pointing since it contains the
+ * ds_link field, except if this is the last TX
+ * descriptor in the queue */
+
+ if ((txq->axq_depth > 1) &&
+ (bf->bf_daddr == ath_hal_gettxbuf(ah, txq->axq_qnum))) {
+ ATH_TXQ_UNLOCK_IRQ_EARLY(txq);
+ goto bf_fail;
+ }
+
ATH_TXQ_REMOVE_HEAD(txq, bf_list);
ATH_TXQ_UNLOCK_IRQ(txq);
Index: madwifi-trunk-r3314/ath/if_athvar.h
===================================================================
--- madwifi-trunk-r3314.orig/ath/if_athvar.h 2008-04-20 23:18:48.000000000 +0200
+++ madwifi-trunk-r3314/ath/if_athvar.h 2008-04-20 23:21:12.000000000 +0200
@@ -586,7 +586,8 @@
} while (0)
#define ATH_TXQ_REMOVE_HEAD(_tq, _field) do { \
STAILQ_REMOVE_HEAD(&(_tq)->axq_q, _field); \
- (_tq)->axq_depth--; \
+ if (--(_tq)->axq_depth <= 0) \
+ (_tq)->axq_link = NULL; \
} while (0)
/* move buffers from MCASTQ to CABQ */
#define ATH_TXQ_MOVE_MCASTQ(_tqs,_tqd) do { \