D46152.diff
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D46152.diff
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	diff --git a/sys/sys/buf_ring.h b/sys/sys/buf_ring.h
	--- a/sys/sys/buf_ring.h
	+++ b/sys/sys/buf_ring.h
	@@ -91,7 +91,7 @@
	do {
	prod_head = br->br_prod_head;
	prod_next = prod_head + 1;
	- cons_tail = br->br_cons_tail;
	+ cons_tail = atomic_load_acq_32(&br->br_cons_tail);

	if ((int32_t)(cons_tail + br->br_prod_size - prod_next) < 1) {
	rmb();
	@@ -229,7 +229,7 @@
	panic("inconsistent list cons_tail=%d cons_head=%d",
	br->br_cons_tail, cons_head);
	#endif
	- br->br_cons_tail = cons_next;
	+ atomic_store_rel_32(&br->br_cons_tail, cons_next);
	return (buf);
	}

	@@ -257,7 +257,7 @@
	#ifdef DEBUG_BUFRING
	br->br_ring[cons_head & mask] = NULL;
	#endif
	- br->br_cons_tail = cons_next;
	+ atomic_store_rel_32(&br->br_cons_tail, cons_next);
	}

	/*