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authorCorbin Atkinson <corbinat@gmail.com>2012-05-04 12:35:10 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-09 14:41:54 -0700
commit642180871bc91afebb6ccf40d1615a7dd33699a3 (patch)
tree10026174fd0c41dd5169160abfbf23928100a313 /drivers/tty
parentb1d679afd766cf425ba1cd2a0fd17451bd212f4a (diff)
downloadop-kernel-dev-642180871bc91afebb6ccf40d1615a7dd33699a3.zip
op-kernel-dev-642180871bc91afebb6ccf40d1615a7dd33699a3.tar.gz
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.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9c4c05b..59fb3ba 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);
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