[PATCH v1 07/17] platform/x86: apple-gmux: Switch to use acpi_bus_get_primary_device()

[Rafael J. Wysocki]

From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>

Replace acpi_get_first_physical_node() that is slated for removal
with acpi_bus_get_primary_device() that takes a reference to the
device it is about to return.

This addresses a potential use-after-free that may occur if the
device returned by acpi_get_first_physical_node() is removed right
after dropping its ACPI companion's physical_node_lock in that
function.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
 include/linux/apple-gmux.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/apple-gmux.h b/include/linux/apple-gmux.h
index 206d97ffda79..d7939c3a08fd 100644
--- a/include/linux/apple-gmux.h
+++ b/include/linux/apple-gmux.h
@@ -109,7 +109,7 @@ static inline bool apple_gmux_detect(struct pnp_dev *pnp_dev, enum apple_gmux_ty
 		if (!adev)
 			return false;
 
-		dev = get_device(acpi_get_first_physical_node(adev));
+		dev = acpi_bus_get_primary_device(adev);
 		acpi_dev_put(adev);
 		if (!dev)
 			return false;
-- 
2.51.0