[PATCH v3 12/22] ACPI: platform_profile: Only remove group when no more handler registered

[Mario Limonciello]

As multiple handlers may register for ACPI platform profile handler,
only remove the sysfs group when the last one unregisters.

Tested-by: Matthew Schwartz <matthew.schwartz@xxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/acpi/platform_profile.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 2d971dba2d917..b70ceb11947d0 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -23,6 +23,12 @@ static const char * const profile_names[] = {
 };
 static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);
 
+static bool platform_profile_is_registered(void)
+{
+	lockdep_assert_held(&profile_lock);
+	return !list_empty(&platform_profile_handler_list);
+}
+
 static ssize_t platform_profile_choices_show(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
@@ -184,8 +190,10 @@ int platform_profile_remove(struct platform_profile_handler *pprof)
 
 	list_del(&pprof->list);
 
-	sysfs_remove_group(acpi_kobj, &platform_profile_group);
 	cur_profile = NULL;
+	if (!platform_profile_is_registered())
+		sysfs_remove_group(acpi_kobj, &platform_profile_group);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(platform_profile_remove);
-- 
2.43.0