Commit d452ab7b authored Feb 26, 2016 by Vitaly Kuznetsov Committed by Greg Kroah-Hartman Mar 01, 2016

Drivers: hv: vmbus: avoid unneeded compiler optimizations in vmbus_wait_for_unload()



Message header is modified by the hypervisor and we read it in a loop,
we need to prevent compilers from optimizing accesses. There are no such
optimizations at this moment, this is just a future proof.

Suggested-by: Radim Krcmar <rkrcmar@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Radim <Kr.má&lt;rkrcmar@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 0f70b669

drivers/hv/channel_mgmt.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -605,7 +605,7 @@ static void vmbus_wait_for_unload(void)
		bool unloaded = false;

		while (1) {
		if (msg->header.message_type == HVMSG_NONE) {
		if (READ_ONCE(msg->header.message_type) == HVMSG_NONE) {
		mdelay(10);
		continue;
		}