[PATCH v6 4/7] ACPI: APEI: GHES: use devm_blocking_notifier_chain_register()

[Eliav Farber <farbere@amazon.com>]

Replace the blocking_notifier_chain_register() +
devm_add_action_or_reset() pattern with a single call to
devm_blocking_notifier_chain_register(), removing the
ghes_vendor_record_notifier_destroy() callback.

Signed-off-by: Eliav Farber <farbere@amazon.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
---
Changes in v6:
- Rebased onto v7.4-rc1. No functional change since v4.
- Jonathan Cameron's Reviewed-by retained; the code is unchanged since
  v4, when it was given.

Changes in v4:
- Split removal of unused code into a separate preceding patch
  (Andy Shevchenko)

 drivers/acpi/apei/ghes.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index a81ffacb16d0..92184ced12b8 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -679,23 +679,12 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
 
 static BLOCKING_NOTIFIER_HEAD(vendor_record_notify_list);
 
-static void ghes_vendor_record_notifier_destroy(void *data)
-{
-	struct notifier_block *nb = data;
-
-	blocking_notifier_chain_unregister(&vendor_record_notify_list, nb);
-}
-
 int devm_ghes_register_vendor_record_notifier(struct device *dev,
 					      struct notifier_block *nb)
 {
-	int ret;
-
-	ret = blocking_notifier_chain_register(&vendor_record_notify_list, nb);
-	if (ret)
-		return ret;
-
-	return devm_add_action_or_reset(dev, ghes_vendor_record_notifier_destroy, nb);
+	return devm_blocking_notifier_chain_register(dev,
+						     &vendor_record_notify_list,
+						     nb);
 }
 EXPORT_SYMBOL_GPL(devm_ghes_register_vendor_record_notifier);
 
-- 
2.47.3