[PATCH 1/4] hwmon: Support guard() and scoped_guard for subsystem locks

[Guenter Roeck <linux@roeck-us.net>]

Add support for guard() and scoped_guard() for the hwmon subsystem lock
to simplify its use.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 Documentation/hwmon/hwmon-kernel-api.rst | 7 ++++---
 include/linux/hwmon.h                    | 2 ++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/Documentation/hwmon/hwmon-kernel-api.rst b/Documentation/hwmon/hwmon-kernel-api.rst
index 1d7f1397a827..9fcde32a140d 100644
--- a/Documentation/hwmon/hwmon-kernel-api.rst
+++ b/Documentation/hwmon/hwmon-kernel-api.rst
@@ -85,9 +85,10 @@ removal.
 When using ``[devm_]hwmon_device_register_with_info()`` to register the
 hardware monitoring device, accesses using the associated access functions
 are serialised by the hardware monitoring core. If a driver needs locking
-for other functions such as interrupt handlers or for attributes which are
-fully implemented in the driver, hwmon_lock() and hwmon_unlock() can be used
-to ensure that calls to those functions are serialized.
+for other functions such as interrupt handlers, attributes which are fully
+implemented in the driver, or debugfs functions, hwmon_lock() and hwmon_unlock()
+can be used to ensure that calls to those functions are serialized. Those
+functions also support guard() and scoped_guard() variants.
 
 Using devm_hwmon_device_register_with_info()
 --------------------------------------------
diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
index 301a83afbd66..04959e044fd0 100644
--- a/include/linux/hwmon.h
+++ b/include/linux/hwmon.h
@@ -495,6 +495,8 @@ char *devm_hwmon_sanitize_name(struct device *dev, const char *name);
 void hwmon_lock(struct device *dev);
 void hwmon_unlock(struct device *dev);
 
+DEFINE_GUARD(hwmon_lock, struct device *, hwmon_lock(_T), hwmon_unlock(_T))
+
 /**
  * hwmon_is_bad_char - Is the char invalid in a hwmon name
  * @ch: the char to be considered
-- 
2.45.2