drivers: hv: vmbus: Increase the time between retries in vmbus_post_msg()

Commit c0bb03924f ("Drivers: hv: vmbus: Raise retry/wait limits in
vmbus_post_msg()") increased the retry/wait limits of vmbus_post_msg()
to address the new DoS protection policies in WS2016.
Increase the time between retries to make the
code more robust.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/connection.c

@@ -390,7 +390,7 @@ int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep)
 		else
 			mdelay(usec / 1000);
 
-		if (usec < 256000)
+		if (retries < 22)
 			usec *= 2;
 	}
 	return ret;