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| author | Corbin Atkinson <corbinat@gmail.com> | 2012-05-04 12:35:10 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-09 14:41:54 -0700 |
| commit | 642180871bc91afebb6ccf40d1615a7dd33699a3 (patch) | |
| tree | 10026174fd0c41dd5169160abfbf23928100a313 /drivers/tty | |
| parent | b1d679afd766cf425ba1cd2a0fd17451bd212f4a (diff) | |
| download | linux-642180871bc91afebb6ccf40d1615a7dd33699a3.tar.gz linux-642180871bc91afebb6ccf40d1615a7dd33699a3.tar.xz linux-642180871bc91afebb6ccf40d1615a7dd33699a3.zip | |
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@ni.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -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 9c4c05b2825b..59fb3ba1e7ca 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2526,14 +2526,16 @@ 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); |