From: K. Y. Srinivasan <kys@microsoft.com>
Date: Mon, 6 Jun 2011 22:49:53 +0000 (-0700)
Subject: Staging: hv: vmbus: Change the memory barrier in hv_ringbuffer_write()
X-Git-Tag: upstream/snapshot3+hdmi~9540^2~568^2~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e690b5a9be26965543b7252492ed22052af960b6;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

Staging: hv: vmbus: Change the memory barrier in hv_ringbuffer_write()

Use the correct memory barrier interface in Change the memory barrier
in hv_ringbuffer_write().

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/hv/ring_buffer.c b/drivers/staging/hv/ring_buffer.c
index 8b62553..42f7672 100644
--- a/drivers/staging/hv/ring_buffer.c
+++ b/drivers/staging/hv/ring_buffer.c
@@ -413,7 +413,7 @@ int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
 					     sizeof(u64));
 
 	/* Make sure we flush all writes before updating the writeIndex */
-	mb();
+	smp_wmb();
 
 	/* Now, update the write location */
 	hv_set_next_write_location(outring_info, next_write_location);