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serial: imx: count tty buffer overruns

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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 <manfred.schlaegl@gmx.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manfred Schlaegl 2015-06-20 19:25:35 +02:00 committed by Greg Kroah-Hartman
parent 8a61f0c70a
commit 9b28993261
1 changed files with 9 additions and 3 deletions
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12
drivers/tty/serial/imx.c
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@ -700,7 +700,8 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
if (sport->port.ignore_status_mask & URXD_DUMMY_READ) if (sport->port.ignore_status_mask & URXD_DUMMY_READ)
goto out; goto out;
tty_insert_flip_char(port, rx, flg); if (tty_insert_flip_char(port, rx, flg) == 0)
sport->port.icount.buf_overrun++;
} }
out: out:
@ -921,8 +922,13 @@ static void dma_rx_callback(void *data)
dev_dbg(sport->port.dev, "We get %d bytes.\n", count); dev_dbg(sport->port.dev, "We get %d bytes.\n", count);
if (count) { if (count) {
if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) {
tty_insert_flip_string(port, sport->rx_buf, count); int bytes = tty_insert_flip_string(port, sport->rx_buf,
count);
if (bytes != count)
sport->port.icount.buf_overrun++;
}
tty_flip_buffer_push(port); tty_flip_buffer_push(port);
start_rx_dma(sport); start_rx_dma(sport);