FAILED: patch "[PATCH] ACPI: configfs: Add missing config_item_put() to fix refcount" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 9a2e849fb6de471b82d19989a7944d3b7671793c Mon Sep 17 00:00:00 2001
From: Hanjun Guo <[email protected]>
Date: Fri, 18 Sep 2020 17:13:28 +0800
Subject: [PATCH] ACPI: configfs: Add missing config_item_put() to fix refcount
leak

config_item_put() should be called in the drop_item callback, to decrement refcount for the config item.

index 88c8af455ea3..cf91f49101ea 100644
@@ -228,6 +228,7 @@ static void acpi_table_drop_item(struct config_group *group,
 
 	ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
 	acpi_unload_table(table->index);
+	config_item_put(cfg);
 }
 
 static struct configfs_group_operations acpi_table_group_ops = {