linux-kernel - [PATCH 27/37] nvmem: core: return -ENOENT if nvmem cell is not found

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Date:   Fri, 27 Jan 2023 11:15:55 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Michael Walle <michael@...le.cc>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 27/37] nvmem: core: return -ENOENT if nvmem cell is not found

From: Michael Walle <michael@...le.cc>

Prior to commit 3cb05fdbaed6 ("nvmem: core: add an index parameter to
the cell") of_nvmem_cell_get() would return -ENOENT if the cell wasn't
found. Particularly, if of_property_match_string() returned -EINVAL,
that return code was passed as the index to of_parse_phandle(), which
then detected it as invalid and returned NULL. That led to an return
code of -ENOENT.

With the new code, the negative index will lead to an -EINVAL of
of_parse_phandle_with_optional_args() which pass straight to the
caller and break those who expect an -ENOENT.

Fix it by always returning -ENOENT.

Fixes: e894d5ad177c ("nvmem: core: add an index parameter to the cell")
Reported-by: Alexander Stein <alexander.stein@...tq-group.com>
Signed-off-by: Michael Walle <michael@...le.cc>
Tested-by: Alexander Stein <alexander.stein@...tq-group.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 81ad6a4c4f86..30057b0094a2 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -1346,7 +1346,7 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id)
 						  "#nvmem-cell-cells",
 						  index, &cell_spec);
 	if (ret)
-		return ERR_PTR(ret);
+		return ERR_PTR(-ENOENT);

 	if (cell_spec.args_count > 1)
 		return ERR_PTR(-EINVAL);
-- 
2.25.1