It should be placed before first time producer and consumer are used.
Signed-off-by: Wei Liu <wei.l...@citrix.com>
---
Cc: Stefano Stabellini <sstabell...@kernel.org>
Cc: Anthony Perard <anthony.per...@citrix.com>
Backport candidate to our own tree.
---
hw/display/xenfb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
index 9866dfd..7f4fad7 100644
--- a/hw/display/xenfb.c
+++ b/hw/display/xenfb.c
@@ -775,10 +775,10 @@ static void xenfb_handle_events(struct XenFB *xenfb)
prod = page->out_prod;
out_cons = page->out_cons;
+ xen_rmb();
if (prod - out_cons > XENFB_OUT_RING_LEN) {
return;
}
- xen_rmb(); /* ensure we see ring contents up to prod */
for (cons = out_cons; cons != prod; cons++) {
union xenfb_out_event *event = &XENFB_OUT_RING_REF(page, cons);
uint8_t type = event->type;
--
2.1.4
