ACPI: APEI: EINJ: Do not fail einj_init() on faux_device_create() failure

CXL has a symbol dependency on einj_core.ko, so if einj_init() fails then
cxl_core.ko fails to load. Prior to the faux_device_create() conversion,
einj_probe() failures were tracked by the einj_initialized flag without
failing einj_init().

Revert to that behavior and always succeed einj_init() given there is no
way, and no pressing need, to discern faux device-create vs device-probe
failures.

This situation arose because CXL knows proper kernel named objects to
trigger errors against, but acpi-einj knows how to perform the error
injection. The injection mechanism is shared with non-CXL use cases. The
result is CXL now has a module dependency on einj-core.ko, and init/probe
failures are handled at runtime.

Fixes: 6cb9441bfe8d ("ACPI: APEI: EINJ: Transition to the faux device interface")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patch.msgid.link/20250607033228.1475625-4-dan.j.williams@intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/apei/einj-core.c b/drivers/acpi/apei/einj-core.c
index fea11a35eea3e18ada0f87f9840f2b613b2410db..9b041415a9d0186e34a5fbc7975566dd6aa15a80 100644 (file)
--- a/drivers/acpi/apei/einj-core.c
+++ b/drivers/acpi/apei/einj-core.c
@@ -883,19 +883,16 @@ static int __init einj_init(void)
        }
 
        einj_dev = faux_device_create("acpi-einj", NULL, &einj_device_ops);
-       if (!einj_dev)
-               return -ENODEV;
 
-       einj_initialized = true;
+       if (einj_dev)
+               einj_initialized = true;
 
        return 0;
 }
 
 static void __exit einj_exit(void)
 {
-       if (einj_initialized)
-               faux_device_destroy(einj_dev);
-
+       faux_device_destroy(einj_dev);
 }
 
 module_init(einj_init);