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author | Richard Fitzgerald <rf@opensource.wolfsonmicro.com> | 2016-09-12 13:01:28 (GMT) |
---|---|---|
committer | Rob Herring <robh@kernel.org> | 2016-09-15 13:32:57 (GMT) |
commit | 79ac5d31df7011e2b60dba4bd1e2f9a9f65e5e1e (patch) | |
tree | c841f12430f9ea9504a3a9a47090e8cccd7cf315 | |
parent | d4b8e2c5b07e20f3ef0ca0a2bde390beb0f8fda5 (diff) | |
download | linux-79ac5d31df7011e2b60dba4bd1e2f9a9f65e5e1e.tar.xz |
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: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Rob Herring <robh@kernel.org>
-rw-r--r-- | drivers/of/base.c | 39 |
1 files changed, 29 insertions, 10 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 3ce6953..b853737 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -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); |