linux-kernel - [PATCH] reset: Fix of_reset_control_get() for consistent return values

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Date:	Tue,  1 Sep 2015 17:28:31 +0200
From:	Alban Bedel <albeu@...e.fr>
To:	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, Alban Bedel <albeu@...e.fr>
Subject: [PATCH] reset: Fix of_reset_control_get() for consistent return values

When of_reset_control_get() is called without connection ID it returns
-ENOENT when the 'resets' property doesn't exists or is an empty entry.
However when a connection ID is given it returns -EINVAL when the 'resets'
property doesn't exists or the requested name can't be found. This is
because the error code returned by of_property_match_string() is just
passed down as an index to of_parse_phandle_with_args(), which then
returns -EINVAL.

To get a consistent return value with both code paths we must return
-ENOENT when of_property_match_string() fails.

Signed-off-by: Alban Bedel <albeu@...e.fr>
---
 drivers/reset/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 3cbc764..fd6ac9b 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -265,9 +265,12 @@ struct reset_control *of_reset_control_get(struct device_node *node,
 	int rstc_id;
 	int ret;
 
-	if (id)
+	if (id) {
 		index = of_property_match_string(node,
 						 "reset-names", id);
+		if (index < 0)
+			return ERR_PTR(-ENOENT);
+	}
 	ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
 					 index, &args);
 	if (ret)
-- 
2.0.0

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