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of: improve reporting invalid overlay target path

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Errors while developing the patch to create of_overlay_fdt_apply()
exposed inadequate error messages to debug problems when overlay
devicetree fragment nodes contain an invalid target path.  Improve
the messages in find_target_node() to remedy this.

Signed-off-by: Frank Rowand <frank.rowand@sony.com>
This commit is contained in:
Frank Rowand 2018-02-12 00:25:04 -08:00 committed by Frank Rowand
parent db2f3762d6
commit e547c00316
1 changed files with 16 additions and 6 deletions
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22
drivers/of/overlay.c
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@ -488,20 +488,30 @@ static int build_changeset(struct overlay_changeset *ovcs)
*/
static struct device_node *find_target_node(struct device_node *info_node)
{
struct device_node *node;
const char *path;
u32 val;
int ret;
ret = of_property_read_u32(info_node, "target", &val);
if (!ret)
return of_find_node_by_phandle(val);
if (!ret) {
node = of_find_node_by_phandle(val);
if (!node)
pr_err("find target, node: %pOF, phandle 0x%x not found\n",
info_node, val);
return node;
}
ret = of_property_read_string(info_node, "target-path", &path);
if (!ret)
return of_find_node_by_path(path);
if (!ret) {
node = of_find_node_by_path(path);
if (!node)
pr_err("find target, node: %pOF, path '%s' not found\n",
info_node, path);
return node;
}
pr_err("Failed to find target for node %p (%s)\n",
info_node, info_node->name);
pr_err("find target, node: %pOF, no target property\n", info_node);
return NULL;
}