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由 Mike Qiu 提交于
Serial session should not be closed for it may be used in next test cases. If it was closed, next test case may fail, in case of the guest hasn't shutdown after the first test case. Becasue, close() function will close the serial fifo file description, and remove that file. The second test case also need to use serial, but it try to open an un-exist fifo file. That lead to the second case fail. Signed-off-by: NMike Qiu <qiudayu@linux.vnet.ibm.com>
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