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serial: imx: count tty buffer overruns

PATCH New [email protected] 1 participant 1 message Jun 20, 2015

Subsystems (2)
Arm i.MX and Layerscape TTY layer and serial drivers
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PATCH 1/1 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 <[email protected]>
---
 drivers/tty/serial/imx.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
drivers/tty/serial/imx.c +9 -2
index 8825039..384cf1d 100644
@@ -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:

@@ -922,8 +923,13 @@ 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);
Signature · 1 line
1.7.10.4