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Commit daeec1f0 authored by Tony Prisk's avatar Tony Prisk
Browse files

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: default avatarRob Herring <robherring2@gmail.com>
Signed-off-by: default avatarTony Prisk <linux@prisktech.co.nz>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarRob Herring <rob.herring@calxeda.com>
parent 3daf3726

drivers/of/base.c

+51 −43
Original line number Diff line number Diff line
@@ -745,6 +745,34 @@ 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.

 *
@@ -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);