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dm: core: of_access: fix return value in of_property_match_string

Browse source 
of_property_match_string calls of_find_property to search for the
string property.
If the device node does not exist, of_find_property returns NULL, and
of_property_match_string returns -EINVAL, which is correct.
However, if the device node exists, but the property is not found,
of_find_property still returns NULL, but it will place -FDT_ERR_NOTFOUND
in the *lenp variable.
of_property_match_string does not use the lenp parameter, thus this error
case is being lost, and treated as if the node is NULL, and returns
-EINVAL, which is incorrect.

The callers of of_property_match_string treat the error differently if
the return value is -EINVAL or -ENOENT, e.g. in dwc3 driver:

	ret = generic_phy_get_by_name(dev, "usb3-phy", &phy);
	if (!ret) {
		ret = generic_phy_init(&phy);
		if (ret)
			return ret;
	} else if (ret != -ENOENT && ret != -ENODATA) {
		debug("could not get phy (err %d)\n", ret);
		return ret;
	} else {
		phy.dev = NULL;
	}

So the caller drivers will just consider the property missing if -ENOENT
is returned, versus the case of -EINVAL, which means something else.

To fix this situation, changed the code to call the of_find_property
with the right third argument to catch this error code and treat it
accordingly.

Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
This commit is contained in:
Eugen Hristev 2023-05-04 15:22:21 +03:00 committed by Simon Glass
parent 0274eb61e1
commit 15a2865515
1 changed files with 4 additions and 1 deletions
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5
drivers/core/of_access.c
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@ -593,11 +593,14 @@ int of_read_u64(const struct device_node *np, const char *propname, u64 *outp)
int of_property_match_string(const struct device_node *np, const char *propname,
const char *string)
{
const struct property *prop = of_find_property(np, propname, NULL);
int len = 0;
const struct property *prop = of_find_property(np, propname, &len);
size_t l;
int i;
const char *p, *end;
if (!prop && len == -FDT_ERR_NOTFOUND)
return -ENOENT;
if (!prop)
return -EINVAL;
if (!prop->value)