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Date: Thu, 20 Jun 2013 12:58:57 +0800 From: Jason Wang <jasowang@...hat.com> To: kys@...rosoft.com, devel@...uxdriverproject.org, linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org Cc: haiyangz@...rosoft.com, Jason Wang <jasowang@...hat.com> Subject: [PATCH] drivers: hv: check interrupt mask before read_index This patches add a read barriers to force the driver to check the interrupt mask before read_index. Otherwise we may lost a kick to host. Cc: K. Y. Srinivasan <kys@...rosoft.com> Cc: Haiyang Zhang <haiyangz@...rosoft.com> Signed-off-by: Jason Wang <jasowang@...hat.com> --- drivers/hv/ring_buffer.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 791f45d..26c93cf 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -75,6 +75,8 @@ static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi) if (rbi->ring_buffer->interrupt_mask) return false; + /* check interrupt_mask before read_index */ + rmb(); /* * This is the only case we need to signal when the * ring transitions from being empty to non-empty. -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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