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40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From 5a28bd29fed8c74021b3e4079ea3035f290615d2 Mon Sep 17 00:00:00 2001
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From: Vitaly Kuznetsov <vkuznets@redhat.com>
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Date: Fri, 26 Feb 2016 15:13:18 -0800
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Subject: [PATCH 35/44] Drivers: hv: vmbus: avoid unneeded compiler
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optimizations in vmbus_wait_for_unload()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Message header is modified by the hypervisor and we read it in a loop,
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we need to prevent compilers from optimizing accesses. There are no such
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optimizations at this moment, this is just a future proof.
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Suggested-by: Radim Krcmar <rkrcmar@redhat.com>
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Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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Reviewed-by: Radim Kr.má<rkrcmar@redhat.com>
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Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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(cherry picked from commit d452ab7b4c65dfcaee88a0d6866eeeb98a3d1884)
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---
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drivers/hv/channel_mgmt.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
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index f70e35278b94..c892db5df665 100644
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--- a/drivers/hv/channel_mgmt.c
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+++ b/drivers/hv/channel_mgmt.c
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@@ -605,7 +605,7 @@ static void vmbus_wait_for_unload(void)
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bool unloaded = false;
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while (1) {
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- if (msg->header.message_type == HVMSG_NONE) {
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+ if (READ_ONCE(msg->header.message_type) == HVMSG_NONE) {
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mdelay(10);
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continue;
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}
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--
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2.11.0
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