libreCMC/target/linux/sunxi/patches-4.4/141-reset-fix-of_reset_control_get.patch

From 7fd7a26b60090a7df15f30ba10b0d39cbbd6a94e Mon Sep 17 00:00:00 2001
From: Alban Bedel <albeu@free.fr>
Date: Tue, 1 Sep 2015 17:28:31 +0200
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@free.fr>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/reset/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -215,9 +215,12 @@ struct reset_control *of_reset_control_g
 {
 	int index = 0;
 
-	if (id)
+	if (id) {
 		index = of_property_match_string(node,
 						 "reset-names", id);
+		if (index < 0)
+			return ERR_PTR(-ENOENT);
+	}
 	return of_reset_control_get_by_index(node, index);
 }
 EXPORT_SYMBOL_GPL(of_reset_control_get);