[PATCH 03/13] serial: 8250_dma: Support for deferred probing when requesting DMA channels

[Peter Ujfalusi <peter.ujfalusi-l0cyMroinI0@public.gmane.org>]

Switch to use ma_request_slave_channel_compat_reason() to request the DMA
channels. In case of error, return the error code we received including
-EPROBE_DEFER

Signed-off-by: Peter Ujfalusi <peter.ujfalusi-l0cyMroinI0@public.gmane.org>
CC: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
---
 drivers/tty/serial/8250/8250_dma.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 21d01a491405..a617eca4e97d 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -182,21 +182,19 @@ int serial8250_request_dma(struct uart_8250_port *p)
 	dma_cap_set(DMA_SLAVE, mask);
 
 	/* Get a channel for RX */
-	dma->rxchan = dma_request_slave_channel_compat(mask,
-						       dma->fn, dma->rx_param,
-						       p->port.dev, "rx");
-	if (!dma->rxchan)
-		return -ENODEV;
+	dma->rxchan = dma_request_slave_channel_compat_reason(mask, dma->fn,
+					dma->rx_param, p->port.dev, "rx");
+	if (IS_ERR(dma->rxchan))
+		return PTR_ERR(dma->rxchan);
 
 	dmaengine_slave_config(dma->rxchan, &dma->rxconf);
 
 	/* Get a channel for TX */
-	dma->txchan = dma_request_slave_channel_compat(mask,
-						       dma->fn, dma->tx_param,
-						       p->port.dev, "tx");
-	if (!dma->txchan) {
+	dma->txchan = dma_request_slave_channel_compat_reason(mask, dma->fn,
+					dma->tx_param, p->port.dev, "tx");
+	if (IS_ERR(dma->txchan)) {
 		dma_release_channel(dma->rxchan);
-		return -ENODEV;
+		return PTR_ERR(dma->txchan);
 	}
 
 	dmaengine_slave_config(dma->txchan, &dma->txconf);
-- 
2.3.5

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