Commit 79ac5d31 authored by Richard Fitzgerald's avatar Richard Fitzgerald Committed by Rob Herring
Browse files

of: Make of_find_property_value_of_size take a length range 



In preparation for adding variable-length array reads, change
of_find_property_value_of_size so that it takes an optional
maximum length. If the maximum is passed as 0, the behaviour is
unchanged and it will return a property if it's >= the requested
minimum length. If maximum is non-zero it will only return a
property whose length is min <= l <= max.

Signed-off-by: default avatarRichard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent d4b8e2c5

drivers/of/base.c

+29 −10
Original line number Diff line number Diff line
@@ -1146,16 +1146,18 @@ EXPORT_SYMBOL_GPL(of_property_count_elems_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

 * @min:	minimum allowed length of property value

 * @max:	maximum allowed length of property value (0 means unlimited)

 * @len:	if !=NULL, actual length is written to here

 *

 * 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.

 * property data is too small or too large.

 *

 */

static void *of_find_property_value_of_size(const struct device_node *np,

			const char *propname, u32 len)

			const char *propname, u32 min, u32 max, size_t *len)

{

	struct property *prop = of_find_property(np, propname, NULL);
@@ -1163,9 +1165,14 @@ static void *of_find_property_value_of_size(const struct device_node *np, 
		return ERR_PTR(-EINVAL);

	if (!prop->value)

		return ERR_PTR(-ENODATA);

	if (len > prop->length)

	if (prop->length < min)

		return ERR_PTR(-EOVERFLOW);

	if (max && prop->length > max)

		return ERR_PTR(-EOVERFLOW);



	if (len)

		*len = prop->length;



	return prop->value;

}
@@ -1189,7 +1196,9 @@ int of_property_read_u32_index(const struct device_node *np, 
				       u32 index, u32 *out_value)

{

	const u32 *val = of_find_property_value_of_size(np, propname,

					((index + 1) * sizeof(*out_value)));

					((index + 1) * sizeof(*out_value)),

					0,

					NULL);



	if (IS_ERR(val))

		return PTR_ERR(val);
@@ -1221,7 +1230,9 @@ int of_property_read_u8_array(const struct device_node *np, 
			const char *propname, u8 *out_values, size_t sz)

{

	const u8 *val = of_find_property_value_of_size(np, propname,

						(sz * sizeof(*out_values)));

						(sz * sizeof(*out_values)),

						0,

						NULL);



	if (IS_ERR(val))

		return PTR_ERR(val);
@@ -1254,7 +1265,9 @@ int of_property_read_u16_array(const struct device_node *np, 
			const char *propname, u16 *out_values, size_t sz)

{

	const __be16 *val = of_find_property_value_of_size(np, propname,

						(sz * sizeof(*out_values)));

						(sz * sizeof(*out_values)),

						0,

						NULL);



	if (IS_ERR(val))

		return PTR_ERR(val);
@@ -1286,7 +1299,9 @@ int of_property_read_u32_array(const struct device_node *np, 
			       size_t sz)

{

	const __be32 *val = of_find_property_value_of_size(np, propname,

						(sz * sizeof(*out_values)));

						(sz * sizeof(*out_values)),

						0,

						NULL);



	if (IS_ERR(val))

		return PTR_ERR(val);
@@ -1314,7 +1329,9 @@ int of_property_read_u64(const struct device_node *np, const char *propname, 
			 u64 *out_value)

{

	const __be32 *val = of_find_property_value_of_size(np, propname,

						sizeof(*out_value));

						sizeof(*out_value),

						0,

						NULL);



	if (IS_ERR(val))

		return PTR_ERR(val);
@@ -1345,7 +1362,9 @@ int of_property_read_u64_array(const struct device_node *np, 
			       size_t sz)

{

	const __be32 *val = of_find_property_value_of_size(np, propname,

						(sz * sizeof(*out_values)));

						(sz * sizeof(*out_values)),

						0,

						NULL);



	if (IS_ERR(val))

		return PTR_ERR(val);

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