On Wed, Feb 14, 2018 at 09:35:46PM -0800, frowand.list@xxxxxxxxx wrote:
> From: Frank Rowand <frank.rowand@xxxxxxxx>
>
> 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@xxxxxxxx>
> ---
>
> changes from v2:
> - add fragment node name as suggested by Geert
> - existing error message printed short node name, thus not
> discriminating between fragments; change to full node name
> - existing error message printed node address, which is devicetree
> internal debugging, not useful in an overlay apply error message;
> remove node address from message
>
> drivers/of/overlay.c | 22 ++++++++++++++++------
> 1 file changed, 16 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> index 5f6c5569e97d..852e566d7744 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -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",
I'm wondering if the core should print the error rather than having all
the callers do it. The question is whether there are cases where failing
is okay? I guess sometimes we use 0 to skip cells, but the core handle
not printing an error in that case.
Rob
> + 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;
> }
> --
> Frank Rowand <frank.rowand@xxxxxxxx>
>
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