of: Remove duplicated code for validating property and value

Several functions in of/base.c have the same code duplicated for
finding and validating a property and value.

struct property *prop = of_find_property(np, propname, NULL);
if (!prop)
	return -EINVAL;
if (!prop->value)
	return -ENODATA;
if (<some length> > prop->length)
	return -EOVERFLOW;

This patch adds of_find_property_value_of_size() which performs the
equivalent of the above code and removes the instances where it was
duplicated in several functions.

Reported-by: Rob Herring <robherring2@gmail.com>
Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>

diff --git a/drivers/of/base.c b/drivers/of/base.c
index f6c89ed..c6443de 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -746,6 +746,34 @@ struct device_node *of_find_node_by_phandle(phandle handle)
 EXPORT_SYMBOL(of_find_node_by_phandle);
 
 /**
+ * of_find_property_value_of_size
+ *
+ * @np:                device node from which the property value is to be read.
+ * @propname:  name of the property to be searched.
+ * @len:       requested length of property value
+ *
+ * Search for a property in a device node and valid the requested size.
+ * Returns the property value on success, -EINVAL if the property does not
+ *  exist, -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ */
+static void *of_find_property_value_of_size(const struct device_node *np,
+                       const char *propname, u32 len)
+{
+       struct property *prop = of_find_property(np, propname, NULL);
+
+       if (!prop)
+               return ERR_PTR(-EINVAL);
+       if (!prop->value)
+               return ERR_PTR(-ENODATA);
+       if (len > prop->length)
+               return ERR_PTR(-EOVERFLOW);
+
+       return prop->value;
+}
+
+/**
  * of_property_read_u32_index - Find and read a u32 from a multi-value property.
  *
  * @np:                device node from which the property value is to be read.
@@ -764,16 +792,13 @@ int of_property_read_u32_index(const struct device_node *np,
                                       const char *propname,
                                       u32 index, u32 *out_value)
 {
-       struct property *prop = of_find_property(np, propname, NULL);
+       const u32 *val = of_find_property_value_of_size(np, propname,
+                                       ((index + 1) * sizeof(*out_value)));
 
-       if (!prop)
-               return -EINVAL;
-       if (!prop->value)
-               return -ENODATA;
-       if (((index + 1) * sizeof(*out_value)) > prop->length)
-               return -EOVERFLOW;
+       if (IS_ERR(val))
+               return PTR_ERR(val);
 
-       *out_value = be32_to_cpup(((__be32 *)prop->value) + index);
+       *out_value = be32_to_cpup(((__be32 *)val) + index);
        return 0;
 }
 EXPORT_SYMBOL_GPL(of_property_read_u32_index);
@@ -799,17 +824,12 @@ EXPORT_SYMBOL_GPL(of_property_read_u32_index);
 int of_property_read_u8_array(const struct device_node *np,
                        const char *propname, u8 *out_values, size_t sz)
 {
-       struct property *prop = of_find_property(np, propname, NULL);
-       const u8 *val;
+       const u8 *val = of_find_property_value_of_size(np, propname,
+                                               (sz * sizeof(*out_values)));
 
-       if (!prop)
-               return -EINVAL;
-       if (!prop->value)
-               return -ENODATA;
-       if ((sz * sizeof(*out_values)) > prop->length)
-               return -EOVERFLOW;
+       if (IS_ERR(val))
+               return PTR_ERR(val);
 
-       val = prop->value;
        while (sz--)
                *out_values++ = *val++;
        return 0;
@@ -837,17 +857,12 @@ EXPORT_SYMBOL_GPL(of_property_read_u8_array);
 int of_property_read_u16_array(const struct device_node *np,
                        const char *propname, u16 *out_values, size_t sz)
 {
-       struct property *prop = of_find_property(np, propname, NULL);
-       const __be16 *val;
+       const __be16 *val = of_find_property_value_of_size(np, propname,
+                                               (sz * sizeof(*out_values)));
 
-       if (!prop)
-               return -EINVAL;
-       if (!prop->value)
-               return -ENODATA;
-       if ((sz * sizeof(*out_values)) > prop->length)
-               return -EOVERFLOW;
+       if (IS_ERR(val))
+               return PTR_ERR(val);
 
-       val = prop->value;
        while (sz--)
                *out_values++ = be16_to_cpup(val++);
        return 0;
@@ -874,17 +889,12 @@ int of_property_read_u32_array(const struct device_node *np,
                               const char *propname, u32 *out_values,
                               size_t sz)
 {
-       struct property *prop = of_find_property(np, propname, NULL);
-       const __be32 *val;
+       const __be32 *val = of_find_property_value_of_size(np, propname,
+                                               (sz * sizeof(*out_values)));
 
-       if (!prop)
-               return -EINVAL;
-       if (!prop->value)
-               return -ENODATA;
-       if ((sz * sizeof(*out_values)) > prop->length)
-               return -EOVERFLOW;
+       if (IS_ERR(val))
+               return PTR_ERR(val);
 
-       val = prop->value;
        while (sz--)
                *out_values++ = be32_to_cpup(val++);
        return 0;
@@ -907,15 +917,13 @@ EXPORT_SYMBOL_GPL(of_property_read_u32_array);
 int of_property_read_u64(const struct device_node *np, const char *propname,
                         u64 *out_value)
 {
-       struct property *prop = of_find_property(np, propname, NULL);
+       const __be32 *val = of_find_property_value_of_size(np, propname,
+                                               sizeof(*out_value));
 
-       if (!prop)
-               return -EINVAL;
-       if (!prop->value)
-               return -ENODATA;
-       if (sizeof(*out_value) > prop->length)
-               return -EOVERFLOW;
-       *out_value = of_read_number(prop->value, 2);
+       if (IS_ERR(val))
+               return PTR_ERR(val);
+
+       *out_value = of_read_number(val, 2);
        return 0;
 }
 EXPORT_SYMBOL_GPL(of_property_read_u64);