From 1d3db608f933605d2dce44a0262ea94da3407465 Mon Sep 17 00:00:00 2001 From: Muhammad Hamza Farooq Date: Fri, 18 Sep 2015 13:08:30 +0200 Subject: [PATCH] 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 [geert: Add more description] Signed-off-by: Geert Uytterhoeven Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sh-sci.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 5dcd8b382e90..84c15152e111 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -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); -- 2.39.2