From: Corbin Date: Wed, 23 May 2012 14:37:31 +0000 (-0500) Subject: serial_core: Update buffer overrun statistics. X-Git-Tag: upstream/snapshot3+hdmi~6943^2~8 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=24a7d449b066bdba8b8b2486dc481f02043e0656;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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 Cc: Jiri Slaby Cc: Alan Cox Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 246b823..a21dc8e 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);