linux-kernel - [PATCH 1/2] of: overlay: add resolver error prints

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Date:	Sun, 26 Jun 2016 22:11:58 +0200
From:	Michal Suchanek <hramrach@...il.com>
To:	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Michal Suchanek <hramrach@...il.com>
Subject: [PATCH 1/2] of: overlay: add resolver error prints

Applying overlay fails silently in case of an error. Add error prints.
Most notably the lack of symbols in the live tree is not reported.

Signed-off-by: Michal Suchanek <hramrach@...il.com>
---
 drivers/of/resolver.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
index d313d49..5d24a4b 100644
--- a/drivers/of/resolver.c
+++ b/drivers/of/resolver.c
@@ -313,6 +313,11 @@ int of_resolve_phandles(struct device_node *resolve)
 	phandle phandle, phandle_delta;
 	int err;
 
+	if (!resolve)
+		pr_err("%s: null node\n", __func__);
+	if (resolve && !of_node_check_flag(resolve, OF_DETACHED))
+		pr_err("%s: node %s not detached\n", __func__,
+			 resolve->full_name);
 	/* the resolve node must exist, and be detached */
 	if (!resolve || !of_node_check_flag(resolve, OF_DETACHED))
 		return -EINVAL;
@@ -369,6 +374,7 @@ int of_resolve_phandles(struct device_node *resolve)
 
 	/* we need to fixup, but no root symbols... */
 	if (!root_sym) {
+		pr_err("%s: no symbols in root of device tree.\n", __func__);
 		err = -EINVAL;
 		goto out;
 	}
-- 
2.8.1