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 stable@vger.kernel.org.

thanks,

greg k-h

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

From 9a2e849fb6de471b82d19989a7944d3b7671793c Mon Sep 17 00:00:00 2001

From: Hanjun Guo guohanjun@huawei.com 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.

Fixes: 772bf1e2878ec ("ACPI: configfs: Unload SSDT on configfs entry removal") Signed-off-by: Hanjun Guo guohanjun@huawei.com [ rjw: Subject edit ] Cc: 4.13+ stable@vger.kernel.org # 4.13+ Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com

diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c index 88c8af455ea3..cf91f49101ea 100644 --- a/drivers/acpi/acpi_configfs.c +++ b/drivers/acpi/acpi_configfs.c @@ -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 = {