[PATCH v2 1/3] acpi/apei: Add devm_ghes_register_vendor_record_notifier()

[Kai-Heng Feng]

Add a device-managed wrapper around ghes_register_vendor_record_notifier()
so drivers can avoid manual cleanup on device removal or probe failure.

Cc: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>
Signed-off-by: Kai-Heng Feng <kaihengf@xxxxxxxxxx>
---
v2:
 - New patch.

 drivers/acpi/apei/ghes.c | 25 +++++++++++++++++++++++++
 include/acpi/ghes.h      |  3 +++
 2 files changed, 28 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 8acd2742bb27..d31a70a05538 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -689,6 +689,31 @@ void ghes_unregister_vendor_record_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier);
 
+static void ghes_vendor_record_notifier_destroy(void *nb)
+{
+	ghes_unregister_vendor_record_notifier(nb);
+}
+
+/**
+ * devm_ghes_register_vendor_record_notifier - device-managed vendor record notifier registration
+ * @dev: device that owns the notifier lifetime
+ * @nb: pointer to the notifier_block structure of the vendor record handler
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int devm_ghes_register_vendor_record_notifier(struct device *dev,
+					      struct notifier_block *nb)
+{
+	int ret;
+
+	ret = ghes_register_vendor_record_notifier(nb);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, ghes_vendor_record_notifier_destroy, nb);
+}
+EXPORT_SYMBOL_GPL(devm_ghes_register_vendor_record_notifier);
+
 static void ghes_vendor_record_work_func(struct work_struct *work)
 {
 	struct ghes_vendor_record_entry *entry;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 7bea522c0657..ca3ace828c1c 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -71,6 +71,9 @@ int ghes_register_vendor_record_notifier(struct notifier_block *nb);
  */
 void ghes_unregister_vendor_record_notifier(struct notifier_block *nb);
 
+int devm_ghes_register_vendor_record_notifier(struct device *dev,
+					      struct notifier_block *nb);
+
 struct list_head *ghes_get_devices(void);
 
 void ghes_estatus_pool_region_free(unsigned long addr, u32 size);
-- 
2.50.1 (Apple Git-155)