linux-kernel - [PATCH] regmap: Fallback to dev_name(map->dev) in case there is no `driver'

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Message-Id: <1342690265-4518-1-git-send-email-dp@opensource.wolfsonmicro.com>
Date:	Thu, 19 Jul 2012 10:31:05 +0100
From:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com
Subject: [PATCH] regmap: Fallback to dev_name(map->dev) in case there is no `driver'

This is useful when we want to use regmap with character devices.

Signed-off-by: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
---
 drivers/base/regmap/regmap-debugfs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index bb1ff17..c2fbf57 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -39,7 +39,10 @@ static ssize_t regmap_name_read_file(struct file *file,
 	if (!buf)
 		return -ENOMEM;
 
-	ret = snprintf(buf, PAGE_SIZE, "%s\n", map->dev->driver->name);
+	if (map->dev->driver && map->dev->driver->name)
+		ret = snprintf(buf, PAGE_SIZE, "%s\n", map->dev->driver->name);
+	else
+		ret = snprintf(buf, PAGE_SIZE, "%s\n", dev_name(map->dev));
 	if (ret < 0) {
 		kfree(buf);
 		return ret;
-- 
1.7.11.2

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