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Commit 64218087 authored by Corbin Atkinson's avatar Corbin Atkinson Committed by Greg Kroah-Hartman
Browse files

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: default avatarCorbin Atkinson <corbin.atkinson@ni.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b1d679af

drivers/tty/serial/serial_core.c

+4 −2
Original line number Diff line number Diff line
@@ -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);