watchdog: Orion: Fix possible null-deference in orion_wdt_probe

If the DT does not include a regs parameter then the null res
would be dereferenced.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index 0478b001b1ef..7c18b3bffcf7 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -156,6 +156,8 @@ static int orion_wdt_probe(struct platform_device *pdev)
         wdt_tclk = clk_get_rate(clk);
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENODEV;
         wdt_reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
         if (!wdt_reg)
                 return -ENOMEM;