We need to issue a full memory barrier prior making a signalling decision.
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
Cc: sta...@vger.kernel.org
---
drivers/hv/ring_buffer.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 2919395..67dc245 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -104,6 +104,7 @@ static bool hv_need_to_signal_on_read(struct
hv_ring_buffer_info *rbi)
u32 cur_write_sz;
u32 pending_sz;
+ mb();
pending_sz = READ_ONCE(rbi->ring_buffer->pending_send_sz);
/* If the other end is not blocked on write don't bother. */
if (pending_sz == 0)
--
1.7.4.1
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