diff options
| author | Sherry Sun <sherry.sun@nxp.com> | 2022-01-11 16:51:30 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-26 14:54:12 +0100 |
| commit | 93cf538e23d024ef19cb6de531c5490576c23ccb (patch) | |
| tree | baf3777ba6cad8272e72dc599ad494fd4fd05822 /drivers/tty/serial | |
| parent | 7a637784d517863e20d0556037aa4758a706a79f (diff) | |
| download | linux-93cf538e23d024ef19cb6de531c5490576c23ccb.tar.bz2 | |
tty: serial: fsl_lpuart: count tty buffer overruns
Added support for counting the tty buffer overruns in fsl_lpuart driver
like other uart drivers.
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20220111085130.5817-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index ce3e26144689..7d90c5a530ee 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -931,7 +931,8 @@ static void lpuart_rxint(struct lpuart_port *sport) sport->port.sysrq = 0; } - tty_insert_flip_char(port, rx, flg); + if (tty_insert_flip_char(port, rx, flg) == 0) + sport->port.icount.buf_overrun++; } out: @@ -1024,7 +1025,8 @@ static void lpuart32_rxint(struct lpuart_port *sport) flg = TTY_OVERRUN; } - tty_insert_flip_char(port, rx, flg); + if (tty_insert_flip_char(port, rx, flg) == 0) + sport->port.icount.buf_overrun++; } out: @@ -1116,7 +1118,7 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport) struct dma_chan *chan = sport->dma_rx_chan; struct circ_buf *ring = &sport->rx_ring; unsigned long flags; - int count = 0; + int count = 0, copied; if (lpuart_is_32(sport)) { unsigned long sr = lpuart32_read(&sport->port, UARTSTAT); @@ -1218,20 +1220,24 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport) if (ring->head < ring->tail) { count = sport->rx_sgl.length - ring->tail; - tty_insert_flip_string(port, ring->buf + ring->tail, count); + copied = tty_insert_flip_string(port, ring->buf + ring->tail, count); + if (copied != count) + sport->port.icount.buf_overrun++; ring->tail = 0; - sport->port.icount.rx += count; + sport->port.icount.rx += copied; } /* Finally we read data from tail to head */ if (ring->tail < ring->head) { count = ring->head - ring->tail; - tty_insert_flip_string(port, ring->buf + ring->tail, count); + copied = tty_insert_flip_string(port, ring->buf + ring->tail, count); + if (copied != count) + sport->port.icount.buf_overrun++; /* Wrap ring->head if needed */ if (ring->head >= sport->rx_sgl.length) ring->head = 0; ring->tail = ring->head; - sport->port.icount.rx += count; + sport->port.icount.rx += copied; } exit: |