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serial: sh-sci: Call dma_async_issue_pending when transaction completes 

dmaengine_submit() will not start the DMA operation, it merely adds
it to the pending queue.  If the queue is no longer running, it won't be
restarted until dma_async_issue_pending() is called.

Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
[geert: Add more description]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Muhammad Hamza Farooq 2015-09-18 13:08:30 +02:00 committed by Greg Kroah-Hartman
parent 371cfed311
commit 1d3db608f9
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/sh-sci.c
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@ -1104,6 +1104,7 @@ static void sci_rx_dma_release(struct sci_port *s, bool enable_pio)
static void sci_dma_rx_complete(void *arg)
{
struct sci_port *s = arg;
struct dma_chan *chan = s->chan_rx;
struct uart_port *port = &s->port;
struct dma_async_tx_descriptor *desc;
unsigned long flags;
@ -1137,6 +1138,8 @@ static void sci_dma_rx_complete(void *arg)
s->active_rx = s->cookie_rx[!active];
dma_async_issue_pending(chan);
dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n",
__func__, s->cookie_rx[active], active, s->active_rx);
spin_unlock_irqrestore(&port->lock, flags);