From 9b289932610edff7d0c11228efbf7a6f81361298 Mon Sep 17 00:00:00 2001 From: Manfred Schlaegl Date: Sat, 20 Jun 2015 19:25:35 +0200 Subject: [PATCH] serial: imx: count tty buffer overruns As can be seen in function uart_insert_char (serial_core) the element buf_overrun of struct uart_icount is used to count overruns of tty-buffer. Added support for counting of overruns in imx driver analogue to serial_core. Signed-off-by: Manfred Schlaegl Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index cddf9026a72b..0628fc4841ca 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -700,7 +700,8 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) if (sport->port.ignore_status_mask & URXD_DUMMY_READ) goto out; - tty_insert_flip_char(port, rx, flg); + if (tty_insert_flip_char(port, rx, flg) == 0) + sport->port.icount.buf_overrun++; } out: @@ -921,8 +922,13 @@ static void dma_rx_callback(void *data) dev_dbg(sport->port.dev, "We get %d bytes.\n", count); if (count) { - if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) - tty_insert_flip_string(port, sport->rx_buf, count); + if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) { + int bytes = tty_insert_flip_string(port, sport->rx_buf, + count); + + if (bytes != count) + sport->port.icount.buf_overrun++; + } tty_flip_buffer_push(port); start_rx_dma(sport); -- 2.20.1