Mark shared producer and consumer indices volatile

diff --git a/sys/dev/pv/if_xnf.c b/sys/dev/pv/if_xnf.c
index ecea2b2..2b5d4bf 100644 (file)
--- a/sys/dev/pv/if_xnf.c
+++ b/sys/dev/pv/if_xnf.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_xnf.c,v 1.29 2016/07/29 22:25:28 mikeb Exp $       */
+/*     $OpenBSD: if_xnf.c,v 1.30 2016/08/01 13:48:33 mikeb Exp $       */
 
 /*
  * Copyright (c) 2015, 2016 Mike Belopuhov
@@ -85,10 +85,10 @@ union xnf_rx_desc {
 #define XNF_RX_MIN             32
 
 struct xnf_rx_ring {
-       uint32_t                 rxr_prod;
-       uint32_t                 rxr_prod_event;
-       uint32_t                 rxr_cons;
-       uint32_t                 rxr_cons_event;
+       volatile uint32_t        rxr_prod;
+       volatile uint32_t        rxr_prod_event;
+       volatile uint32_t        rxr_cons;
+       volatile uint32_t        rxr_cons_event;
        uint32_t                 rxr_reserved[12];
        union xnf_rx_desc        rxr_desc[XNF_RX_DESC];
 } __packed;
@@ -124,10 +124,10 @@ union xnf_tx_desc {
 #define XNF_TX_FRAG            18
 
 struct xnf_tx_ring {
-       uint32_t                 txr_prod;
-       uint32_t                 txr_prod_event;
-       uint32_t                 txr_cons;
-       uint32_t                 txr_cons_event;
+       volatile uint32_t        txr_prod;
+       volatile uint32_t        txr_prod_event;
+       volatile uint32_t        txr_cons;
+       volatile uint32_t        txr_cons_event;
        uint32_t                 txr_reserved[12];
        union xnf_tx_desc        txr_desc[XNF_TX_DESC];
 } __packed;