[PATCH] dma: of-dma: return error when 'dma-cells' not found

[Padmavathi Venna]

This patch returns error when 'dma-cells' property not found
in the corresponding device node. With out this change there
is a crash in the generic dma incompatible platforms.

Signed-off-by: Padmavathi Venna <padma.v at samsung.com>
---

Based on Vinod Koul next branch.

 drivers/dma/of-dma.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 69d04d2..46aca0d 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -92,6 +92,7 @@ int of_dma_controller_register(struct device_node *np,
 				void *data)
 {
 	struct of_dma	*ofdma;
+	const	 __be32 *ip;
 	int		nbcells;
 
 	if (!np || !of_dma_xlate) {
@@ -103,7 +104,12 @@ int of_dma_controller_register(struct device_node *np,
 	if (!ofdma)
 		return -ENOMEM;
 
-	nbcells = be32_to_cpup(of_get_property(np, "#dma-cells", NULL));
+	ip = of_get_property(np, "#dma-cells", NULL);
+	if (!ip)
+		return -ENXIO;
+
+	nbcells = be32_to_cpup(ip);
+
 	if (!nbcells) {
 		pr_err("%s: #dma-cells property is missing or invalid\n",
 		       __func__);
-- 
1.7.4.4