linux-kernel - [PATCH v2] regmap: Fix debugfs-file 'registers' mode

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Date:	Mon,  8 Sep 2014 08:43:37 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kernel@...gutronix.de, Markus Pargmann <mpa@...gutronix.de>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
Subject: [PATCH v2] regmap: Fix debugfs-file 'registers' mode

The macro "REGMAP_ALLOW_WRITE_DEBUGFS" can be used to enable write
support on the registers file in the debugfs. The mode of the file is
fixed to 0400 so it is not possible to write the file ever.

This patch fixes the mode by setting it to the correct value depending
on the macro.

Cc: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
---

Notes:
    Changes in v2:
    - Change registers_mode type to umode_t.

 drivers/base/regmap/regmap-debugfs.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 625417e53bdd..d4e8a6f30c16 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -512,7 +512,14 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
 			    map, &regmap_reg_ranges_fops);
 
 	if (map->max_register || regmap_readable(map, 0)) {
-		debugfs_create_file("registers", 0400, map->debugfs,
+		umode_t registers_mode;
+
+		if (IS_ENABLED(REGMAP_ALLOW_WRITE_DEBUGFS))
+			registers_mode = 0600;
+		else
+			registers_mode = 0400;
+
+		debugfs_create_file("registers", registers_mode, map->debugfs,
 				    map, &regmap_map_fops);
 		debugfs_create_file("access", 0400, map->debugfs,
 				    map, &regmap_access_fops);
-- 
2.1.0

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