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serial_core: Update buffer overrun statistics.

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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>
This commit is contained in:
Corbin 2012-05-23 09:37:31 -05:00 committed by Greg Kroah-Hartman
parent 10e7d0980f
commit 24a7d449b0
1 changed files with 4 additions and 2 deletions
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6
drivers/tty/serial/serial_core.c
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@ -2527,14 +2527,16 @@ void uart_insert_char(struct uart_port *port, unsigned int status,
struct tty_struct *tty = port->state->port.tty; struct tty_struct *tty = port->state->port.tty;
if ((status & port->ignore_status_mask & ~overrun) == 0) 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, * Overrun is special. Since it's reported immediately,
* it doesn't affect the current character. * it doesn't affect the current character.
*/ */
if (status & ~port->ignore_status_mask & overrun) 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); EXPORT_SYMBOL_GPL(uart_insert_char);