diff options
| author | Mark Brown <broonie@kernel.org> | 2017-12-12 19:56:43 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-12-13 19:22:31 +0300 |
| commit | 72465736adf2aade263a9475a1d42007fd49e703 (patch) | |
| tree | ddc19ef33b47c55b130e78cca79b3f6b064cd2c4 /drivers/base/regmap/internal.h | |
| parent | 81e30b189f593afbf10a7bf47f18f030f8aea3b5 (diff) | |
| download | linux-72465736adf2aade263a9475a1d42007fd49e703.tar.xz | |
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/internal.h')
| -rw-r--r-- | drivers/base/regmap/internal.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index 8641183cac2f..53785e0e297a 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -77,6 +77,7 @@ struct regmap { int async_ret; #ifdef CONFIG_DEBUG_FS + bool debugfs_disable; struct dentry *debugfs; const char *debugfs_name; @@ -215,10 +216,17 @@ struct regmap_field { extern void regmap_debugfs_initcall(void); extern void regmap_debugfs_init(struct regmap *map, const char *name); extern void regmap_debugfs_exit(struct regmap *map); + +static inline void regmap_debugfs_disable(struct regmap *map) +{ + map->debugfs_disable = true; +} + #else static inline void regmap_debugfs_initcall(void) { } static inline void regmap_debugfs_init(struct regmap *map, const char *name) { } static inline void regmap_debugfs_exit(struct regmap *map) { } +static inline void regmap_debugfs_disable(struct regmap *map) { } #endif /* regcache core declarations */ |