[PATCH 1/3] ACPI: Make acpi_fwnode_handle safer

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Check that the fwnode argument passed to acpi_fwnode_handle is non-NULL,
and return NULL if it is, otherwise the fwnode. Thus the caller doesn't
have to ensure the argument is a valid non-NULL fwnode.

Cc: stable@vger.kernel.org # v5.15 and up
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 include/acpi/acpi_bus.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 53b6e9f9de7b4..c34d94521d40c 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -445,7 +445,7 @@ static inline bool acpi_data_node_match(const struct fwnode_handle *fwnode,
 
 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
 {
-	return &adev->fwnode;
+	return adev ? &adev->fwnode : NULL;
 }
 
 static inline void *acpi_driver_data(struct acpi_device *d)
-- 
2.30.2