dmaengine: of: bail out early if "dmas" property is not present

And don't print an error: not configured is not an error.

Reported-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index d5fbeaa..ca31f1b 100644 (file)
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -159,6 +159,10 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
                return ERR_PTR(-ENODEV);
        }
 
+       /* Silently fail if there is not even the "dmas" property */
+       if (!of_find_property(np, "dmas", NULL))
+               return ERR_PTR(-ENODEV);
+
        count = of_property_count_strings(np, "dma-names");
        if (count < 0) {
                pr_err("%s: dma-names property of node '%s' missing or empty\n",