linux-kernel - [PATCH v6 11/12] of: earlycon: Log more helpful message if stdout-path node not found

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Message-Id: <1452986629-17210-12-git-send-email-peter@hurleysoftware.com>
Date:	Sat, 16 Jan 2016 15:23:48 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Grant Likely <grant.likely@...aro.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, Kevin Cernekee <cernekee@...il.com>,
	Jon Hunter <jonathanh@...dia.com>,
	Paul Burton <paul.burton@...tec.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Sebastian Frias <sf84@...oste.net>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v6 11/12] of: earlycon: Log more helpful message if stdout-path node not found

Earlycon may fail to initialize for a variety of reasons, most of
which log the default early param message. If the stdout-path node is
not found, log the path which was not found (and suppress the
default early param message).

Acked-by: Rob Herring <robh@...nel.org>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/of/fdt.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 918809e..e2295b2 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -820,11 +820,14 @@ static int __init early_init_dt_scan_chosen_serial(void)
 	q = strchrnul(p, ':');
 	if (*q != '\0')
 		options = q + 1;
+	l = q - p;
 
 	/* Get the node specified by stdout-path */
-	offset = fdt_path_offset_namelen(fdt, p, q - p);
-	if (offset < 0)
-		return -ENODEV;
+	offset = fdt_path_offset_namelen(fdt, p, l);
+	if (offset < 0) {
+		pr_warn("earlycon: stdout-path %.*s not found\n", l, p);
+		return 0;
+	}
 
 	for (match = __earlycon_table; match < __earlycon_table_end; match++) {
 		if (!match->compatible[0])
-- 
2.7.0