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Date: Wed, 23 Mar 2016 17:53:53 -0700 From: "K. Y. Srinivasan" <kys@...rosoft.com> To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com, jasowang@...hat.com Cc: "K. Y. Srinivasan" <kys@...rosoft.com>, stable@...r.kernel.org Subject: [PATCH 3/7] Drivers: hv: vmbus: Fix a bug in hv_need_to_signal_on_read() We need to issue a full memory barrier prior making a signalling decision. Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com> Cc: stable@...r.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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