[RFC PATCH 3/3] ACPI: platform_profile: Add platform_profile_refresh_choices()

[Kurt Borja <kuurtb@gmail.com>]

Let drivers dynamically refresh selected choices safely, while holding
`profile_lock`.

Signed-off-by: Kurt Borja <kuurtb@gmail.com>
---
 drivers/acpi/platform_profile.c  | 23 +++++++++++++++++++++++
 include/linux/platform_profile.h |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index ec749c2d0695..087280d786b1 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -459,6 +459,29 @@ int platform_profile_cycle(void)
 }
 EXPORT_SYMBOL_GPL(platform_profile_cycle);
 
+int platform_profile_refresh_choices(struct platform_profile_handler *pprof)
+{
+	unsigned long backup[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
+	int err;
+
+	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
+		bitmap_copy(backup, pprof->choices, PLATFORM_PROFILE_LAST);
+
+		err = pprof->ops->choices(pprof);
+		if (err) {
+			bitmap_copy(pprof->choices, backup, PLATFORM_PROFILE_LAST);
+			return err;
+		}
+
+		_notify_class_profile(pprof->class_dev, NULL);
+	}
+
+	sysfs_notify(acpi_kobj, NULL, "platform_profile");
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(platform_profile_refresh_choices);
+
 int platform_profile_register(struct platform_profile_handler *pprof)
 {
 	int err;
diff --git a/include/linux/platform_profile.h b/include/linux/platform_profile.h
index 7f266a60b41a..7d543dd8c164 100644
--- a/include/linux/platform_profile.h
+++ b/include/linux/platform_profile.h
@@ -50,6 +50,7 @@ int platform_profile_register(struct platform_profile_handler *pprof);
 int platform_profile_remove(struct platform_profile_handler *pprof);
 int devm_platform_profile_register(struct platform_profile_handler *pprof);
 int platform_profile_cycle(void);
+int platform_profile_refresh_choices(struct platform_profile_handler *pprof);
 void platform_profile_notify(struct platform_profile_handler *pprof);
 
 #endif  /*_PLATFORM_PROFILE_H_*/
-- 
2.47.1