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authorJeremy Kerr <jk@ozlabs.org>2018-03-21 10:52:38 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-23 16:34:06 +0100
commit4f794097797f551917b68797e39f25fcb17d5b3a (patch)
tree0e3744bc26a6170e36de43337d3d3ff1828839a3 /drivers/tty/serial
parentc685af1108d7c303f0b901413405d68eaeac4477 (diff)
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op-kernel-dev-4f794097797f551917b68797e39f25fcb17d5b3a.tar.gz
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>
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r--drivers/tty/serial/serial_core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 35b9201..0466f9f 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -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)) \
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