diff options
| author | Corbin <corbinat@gmail.com> | 2012-05-23 09:37:31 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-12 15:40:30 -0700 |
| commit | dabfb351db690964f6c5f5729d4f407586f69a4f (patch) | |
| tree | dec6dc94612e3e37695e2ca248e7b093deb333c7 | |
| parent | 7d0b066fbb912debc18e9556187f2d0313b8469e (diff) | |
serial_core: Update buffer overrun statistics.
Currently, serial drivers don't report buffer overruns. When a buffer overrun
occurs, tty_insert_flip_char returns 0, and no attempt is made to insert that
same character again (i.e. it is lost). This patch reports buffer overruns via
the buf_overrun field in the port's icount structure.
Signed-off-by: Corbin Atkinson <corbin.atkinson@xxxxxx>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 246b823c1b2..a21dc8e3b7c 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2527,14 +2527,16 @@ void uart_insert_char(struct uart_port *port, unsigned int status, struct tty_struct *tty = port->state->port.tty; if ((status & port->ignore_status_mask & ~overrun) == 0) - tty_insert_flip_char(tty, ch, flag); + if (tty_insert_flip_char(tty, ch, flag) == 0) + ++port->icount.buf_overrun; /* * Overrun is special. Since it's reported immediately, * it doesn't affect the current character. */ if (status & ~port->ignore_status_mask & overrun) - tty_insert_flip_char(tty, 0, TTY_OVERRUN); + if (tty_insert_flip_char(tty, 0, TTY_OVERRUN) == 0) + ++port->icount.buf_overrun; } EXPORT_SYMBOL_GPL(uart_insert_char); |