diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-08-21 20:02:57 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 17:33:48 +0100 |
| commit | 99dc8e400e93773fb45c57cc969c7be443d98141 (patch) | |
| tree | 601794804a0b4865fc9e416b89ed502646489f18 /drivers/tty/serial/sh-sci.c | |
| parent | 8eadb56d6830f169fd225a59e0e27dd97fc762c1 (diff) | |
serial: sh-sci: Don't call sci_dma_rx_push() if no data has arrived
On receive DMA time-out, avoid calling sci_dma_rx_push() if no data was
transferred by the timed out DMA request.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/sh-sci.c')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index ffcbf6eaf5f9..d8b73e791a55 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1467,10 +1467,11 @@ static void work_fn_rx(struct work_struct *work) dev_dbg(port->dev, "Read %u bytes with cookie %d\n", read, s->active_rx); - count = sci_dma_rx_push(s, s->rx_buf[new], read); - - if (count) - tty_flip_buffer_push(&port->state->port); + if (read) { + count = sci_dma_rx_push(s, s->rx_buf[new], read); + if (count) + tty_flip_buffer_push(&port->state->port); + } spin_unlock_irqrestore(&port->lock, flags); |