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Commit 4f794097 authored by Jeremy Kerr's avatar Jeremy Kerr Committed by Greg Kroah-Hartman
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serial: expose buf_overrun count through proc interface 



The buf_overrun count is only every written, and not exposed to
userspace anywhere. This means that dropped characters due to flip
buffer overruns are never visible to userspace.

The /proc/tty/driver/serial file exports a bunch of metrics (including
hardware overruns) already, so add the buf_overrun (as "bo:") to this
file.

Signed-off-by: default avatarJeremy Kerr <jk@ozlabs.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c685af11

drivers/tty/serial/serial_core.c

+2 −0
Original line number Diff line number Diff line
@@ -1786,6 +1786,8 @@ static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 
			seq_printf(m, " brk:%d", uport->icount.brk);

		if (uport->icount.overrun)

			seq_printf(m, " oe:%d", uport->icount.overrun);

		if (uport->icount.buf_overrun)

			seq_printf(m, " bo:%d", uport->icount.buf_overrun);



#define INFOBIT(bit, str) \

	if (uport->mctrl & (bit)) \