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path: root/drivers/tty/serial/8250/8250_omap.c
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Diffstat (limited to 'drivers/tty/serial/8250/8250_omap.c')
-rw-r--r--drivers/tty/serial/8250/8250_omap.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index e7e64913a748..833771bca0a5 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -613,6 +613,10 @@ static int omap_8250_startup(struct uart_port *port)
up->lsr_saved_flags = 0;
up->msr_saved_flags = 0;
+ /* Disable DMA for console UART */
+ if (uart_console(port))
+ up->dma = NULL;
+
if (up->dma) {
ret = serial8250_request_dma(up);
if (ret) {
@@ -782,8 +786,27 @@ unlock:
static void __dma_rx_complete(void *param)
{
- __dma_rx_do_complete(param);
- omap_8250_rx_dma(param);
+ struct uart_8250_port *p = param;
+ struct uart_8250_dma *dma = p->dma;
+ struct dma_tx_state state;
+ unsigned long flags;
+
+ spin_lock_irqsave(&p->port.lock, flags);
+
+ /*
+ * If the tx status is not DMA_COMPLETE, then this is a delayed
+ * completion callback. A previous RX timeout flush would have
+ * already pushed the data, so exit.
+ */
+ if (dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state) !=
+ DMA_COMPLETE) {
+ spin_unlock_irqrestore(&p->port.lock, flags);
+ return;
+ }
+ __dma_rx_do_complete(p);
+ omap_8250_rx_dma(p);
+
+ spin_unlock_irqrestore(&p->port.lock, flags);
}
static void omap_8250_rx_dma_flush(struct uart_8250_port *p)