tree 0e3744bc26a6170e36de43337d3d3ff1828839a3
parent c685af1108d7c303f0b901413405d68eaeac4477
author Jeremy Kerr <jk@ozlabs.org> 1521600758 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1521819246 +0100

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: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>