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提交 4f794097 编写于 作者: J Jeremy Kerr 提交者: Greg Kroah-Hartman

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: NJeremy Kerr <jk@ozlabs.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 c685af11
...@@ -1786,6 +1786,8 @@ static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) ...@@ -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); seq_printf(m, " brk:%d", uport->icount.brk);
if (uport->icount.overrun) if (uport->icount.overrun)
seq_printf(m, " oe:%d", 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) \ #define INFOBIT(bit, str) \
if (uport->mctrl & (bit)) \ if (uport->mctrl & (bit)) \
......
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