tty: serial: msm_serial: Don't require DT aliases

If there isn't a DT alias then of_alias_get_id() will return -ENODEV. This will cause the msm_serial driver to fail probe, when we want to keep the previous behavior where we generated a dynamic line number at probe time. Restore this behavior by generating a dynamic id if the line number is still negative after checking for an alias or in the non-DT case looking at the .id field of the platform device.

---
 drivers/tty/serial/msm_serial.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

index 09364dd8cf3a..d1bc6b6cbc70 100644
@@ -1046,14 +1046,14 @@ static int msm_serial_probe(struct platform_device *pdev)
 	const struct of_device_id *id;
 	int irq, line;
 
-	if (pdev->id == -1)
-		pdev->id = atomic_inc_return(&msm_uart_next_id) - 1;
-
 	if (pdev->dev.of_node)
 		line = of_alias_get_id(pdev->dev.of_node, "serial");
 	else
 		line = pdev->id;
 
+	if (line < 0)
+		line = atomic_inc_return(&msm_uart_next_id) - 1;
+
 	if (unlikely(line < 0 || line >= UART_NR))
 		return -ENXIO;
 

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Greg,

Can you add this to tty-next. Without this, all the ARM/qcom boards do not boot in linux-next.

Thanks,

Kevin