APEI: GHES: correctly return NULL for ghes_get_devices()

Since 315bada690e0 ("EDAC: Check for GHES preference in the
chipset-specific EDAC drivers"), vendor specific EDAC driver will not
probe correctly when CONFIG_ACPI_APEI_GHES is enabled but no GHES device
is present.  Make ghes_get_devices() return NULL when the GHES device
list is empty to fix the problem.

Fixes: 9057a3f7ac36 ("EDAC/ghes: Prepare to make ghes_edac a proper module")
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index a4148a7d3afe0b88abd91b74a17890bbb3780b31..ef59d6ea16da0ff693d692dee9e0b197dc213825 100644 (file)
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1542,6 +1542,8 @@ struct list_head *ghes_get_devices(void)
 
                        pr_warn_once("Force-loading ghes_edac on an unsupported platform. You're on your own!\n");
                }
+       } else if (list_empty(&ghes_devs)) {
+               return NULL;
        }
 
        return &ghes_devs;