pinctrl: freescale: imx: fix bogus check of of_iomap() return value

commit 9a4f424531dabd877259ae0071b8bcc4dede9eb5 upstream.

On error path of_iomap() returns NULL, hence IS_ERR() check is invalid
and may cause a NULL pointer dereference, the change fixes this
problem.

While we are here invert a device node check to simplify the code.

Fixes: 26d8cde5260b ("pinctrl: freescale: imx: add shared input select reg support")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index a5bb939873789710d0b00dfcda9805bd287ce92d..1029aa7889b55233fd0b5e3cf5d31ea245f9e2c7 100644 (file)
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx.c
@@ -726,19 +726,18 @@ int imx_pinctrl_probe(struct platform_device *pdev,
 
        if (of_property_read_bool(dev_np, "fsl,input-sel")) {
                np = of_parse_phandle(dev_np, "fsl,input-sel", 0);
-               if (np) {
-                       ipctl->input_sel_base = of_iomap(np, 0);
-                       if (IS_ERR(ipctl->input_sel_base)) {
-                               of_node_put(np);
-                               dev_err(&pdev->dev,
-                                       "iomuxc input select base address not found\n");
-                               return PTR_ERR(ipctl->input_sel_base);
-                       }
-               } else {
+               if (!np) {
                        dev_err(&pdev->dev, "iomuxc fsl,input-sel property not found\n");
                        return -EINVAL;
                }
+
+               ipctl->input_sel_base = of_iomap(np, 0);
                of_node_put(np);
+               if (!ipctl->input_sel_base) {
+                       dev_err(&pdev->dev,
+                               "iomuxc input select base address not found\n");
+                       return -ENOMEM;
+               }
        }
 
        imx_pinctrl_desc.name = dev_name(&pdev->dev);