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-rw-r--r--sys/netgraph/ng_base.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/netgraph/ng_base.c b/sys/netgraph/ng_base.c
index 78b4aaa59bf9..d7370eb82ad2 100644
--- a/sys/netgraph/ng_base.c
+++ b/sys/netgraph/ng_base.c
@@ -3027,7 +3027,7 @@ ng_getqblk(void)
* ngqfree is the final arbiter. We have our little reserve
* because we use M_NOWAIT for malloc. This just helps us
* avoid dropping packets while not increasing the time
- * we take to service the interrupt (on average) (we hope).
+ * we take to service the interrupt (on average) (I hope).
*/
for (;;) {
if ((ngqfreesize < ngqfreelow) || (ngqfree == NULL)) {
@@ -3062,15 +3062,19 @@ ng_getqblk(void)
*/
if (atomic_cmpset_ptr(&ngqfree, item, item->el_next)) {
atomic_subtract_int(&ngqfreesize, 1);
+ item->el_flags &= ~NGQF_FREE;
break;
}
+ /*
+ * something got there before we did.. try again
+ * (go around the loop again)
+ */
item = NULL;
} else {
/* We really ran out */
break;
}
}
- item->el_flags &= ~NGQF_FREE;
return (item);
}