gpio/pca953x: Fix wrong pointer type

pca953x_get_alt_pdata() uses uint16_t* as result type for
of_get_property(), but numeric of values are __be32.

Checking for negative values is bogus because of-property
values are unsigned by definition.
Instead check for proper property size.

v3: - assume big-endian properties
    - check property size
v2: - removed bogus check for negative property values

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index a261972f603d..694b0f9c4b6c 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -448,7 +448,8 @@ pca953x_get_alt_pdata(struct i2c_client *client)
 {
         struct pca953x_platform_data *pdata;
         struct device_node *node;
-        const uint16_t *val;
+        const __be32 *val;
+        int size;
 
         node = client->dev.of_node;
         if (node == NULL)
@@ -461,13 +462,13 @@ pca953x_get_alt_pdata(struct i2c_client *client)
         }
 
         pdata->gpio_base = -1;
-        val = of_get_property(node, "linux,gpio-base", NULL);
+        val = of_get_property(node, "linux,gpio-base", &size);
         if (val) {
-                if (*val < 0)
-                        dev_warn(&client->dev,
-                                 "invalid gpio-base in device tree\n");
+                if (size != sizeof(*val))
+                        dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
+                                 node->full_name);
                 else
-                        pdata->gpio_base = *val;
+                        pdata->gpio_base = be32_to_cpup(val);
         }
 
         val = of_get_property(node, "polarity", NULL);