[win-pv-devel] [PATCH 01/15] Add missing barrier

[Paul Durrant <pdurrant@xxxxxxxxx>]

Testing an event word flag should always be preceded by a barrier (unless
using a locked operation).

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
 src/xenbus/evtchn_fifo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/xenbus/evtchn_fifo.c b/src/xenbus/evtchn_fifo.c
index e045cd0..cef639d 100644
--- a/src/xenbus/evtchn_fifo.c
+++ b/src/xenbus/evtchn_fifo.c
@@ -102,6 +102,7 @@ __EvtchnFifoTestFlag(
     IN  ULONG           Flag
     )
 {
+    KeMemoryBarrier();
     return (*EventWord & (1 << Flag)) ? TRUE : FALSE;
 }
 
-- 
2.1.1


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