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| author | Mark Brown <broonie@kernel.org> | 2017-12-12 17:56:43 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-12-13 17:22:31 +0100 |
| commit | 72465736adf2aade263a9475a1d42007fd49e703 (patch) | |
| tree | ddc19ef33b47c55b130e78cca79b3f6b064cd2c4 /drivers/base/regmap/regmap-debugfs.c | |
| parent | regmap: rename regmap_lock_unlock_empty() to regmap_lock_unlock_none() (diff) | |
| download | linux-72465736adf2aade263a9475a1d42007fd49e703.tar.xz linux-72465736adf2aade263a9475a1d42007fd49e703.zip | |
regmap: Disable debugfs when locking is disabled
The recently added support for disabling the regmap internal locking left
debugfs enabled for devices with the locking disabled. This is a problem
since debugfs allows userspace to do things like initiate reads from the
hardware which will use the scratch buffers protected by the regmap locking
so could cause data corruption.
For safety address this by just disabling debugfs for these devices. That
is overly conservative since some of the debugfs files just read internal
data structures but it's much simpler to implmement and less likely to
lead to problems with tooling that works with debugfs.
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base/regmap/regmap-debugfs.c')
| -rw-r--r-- | drivers/base/regmap/regmap-debugfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index 36ce3511c733..c8ecefd75d6f 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -529,6 +529,9 @@ void regmap_debugfs_init(struct regmap *map, const char *name) struct regmap_range_node *range_node; const char *devname = "dummy"; + if (map->debugfs_disable) + return; + /* If we don't have the debugfs root yet, postpone init */ if (!regmap_debugfs_root) { struct regmap_debugfs_node *node; |