Hi Chunyan Zhang,

On Fri, Jan 16, 2015 at 06:00:11PM +0800, Chunyan Zhang wrote:

+		if (uart_handle_sysrq_char(port, ch))
+			continue;

You don't define SUPPORT_SYSRQ, so uart_handle_sysrq_char has no effect. See 
include/linux/serial_core.h.

baruch

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