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of: base: Improve argument length mismatch error

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commit 5d05b811b5acb92fc581a7b328b36646c86f5ab9 upstream.

The cells_name field of of_phandle_iterator might be NULL. Use the
phandle name instead. With this change instead of:

  OF: /soc/pinctrl@1000000: (null) = 3 found 2

We get:

  OF: /soc/pinctrl@1000000: phandle pinctrl@1000000 needs 3, found 2

Which is a more helpful messages making DT debugging easier.

In this particular example the phandle name looks like duplicate of the
same node name. But note that the first node is the parent node
(it->parent), while the second is the phandle target (it->node). They
happen to be the same in the case that triggered this improvement. See
commit 72cb4c48a46a ("arm64: dts: qcom: ipq6018: Fix gpio-ranges
property").

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/f6a68e0088a552ea9dfd4d8e3b5b586d92594738.1640881913.git.baruch@tkos.co.il
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baruch Siach 2021-12-30 18:31:53 +02:00 committed by Greg Kroah-Hartman
parent 7bb99c7e13
commit 12224c0d19
1 changed files with 8 additions and 3 deletions
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11
drivers/of/base.c
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@ -1328,9 +1328,14 @@ int of_phandle_iterator_next(struct of_phandle_iterator *it)
* property data length
*/
if (it->cur + count > it->list_end) {
pr_err("%pOF: %s = %d found %td\n",
it->parent, it->cells_name,
count, it->list_end - it->cur);
if (it->cells_name)
pr_err("%pOF: %s = %d found %td\n",
it->parent, it->cells_name,
count, it->list_end - it->cur);
else
pr_err("%pOF: phandle %s needs %d, found %td\n",
it->parent, of_node_full_name(it->node),
count, it->list_end - it->cur);
goto err;
}
}