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SubjectApplied "regmap: debugfs: document why we don't create the debugfs entries" to the regmap tree
The patch

regmap: debugfs: document why we don't create the debugfs entries

has been applied to the regmap tree at

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From 078711d7f88d33b0adebb402a1bcb2aa89afe68b Mon Sep 17 00:00:00 2001
From: Bartosz Golaszewski <>
Date: Fri, 22 Dec 2017 18:42:08 +0100
Subject: [PATCH] regmap: debugfs: document why we don't create the debugfs

This is a follow-up to commit a5ba91c380b8 ("regmap: debugfs: emit a
debug message when locking is disabled"). I figured that a user may
see this message, grep the code, come to this place and he still won't
know why we actually disabled debugfs.

Add a comment explaining the reason.

Signed-off-by: Bartosz Golaszewski <>
Signed-off-by: Mark Brown <>
drivers/base/regmap/regmap-debugfs.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index ae962b756863..f3266334063e 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -529,6 +529,13 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
struct regmap_range_node *range_node;
const char *devname = "dummy";

+ /*
+ * Userspace can initiate reads from the hardware over debugfs.
+ * Normally internal regmap structures and buffers are protected with
+ * a mutex or a spinlock, but if the regmap owner decided to disable
+ * all locking mechanisms, this is no longer the case. For safety:
+ * don't create the debugfs entries if locking is disabled.
+ */
if (map->debugfs_disable) {
dev_dbg(map->dev, "regmap locking disabled - not creating debugfs entries\n");
 \ /
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