ACPI, APEI, ERST, Prevent erst_dbg from loading if ERST is disabled

erst_dbg module can not work when ERST is disabled.  So disable module
loading to provide clearer information to user.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/apei/erst-dbg.c b/drivers/acpi/apei/erst-dbg.c
index a4cfb64c86a157bcf8ae22730d6a7943e31af7e0..cb04aa43c33a411d4f43397d4485345a001866f9 100644 (file)
--- a/drivers/acpi/apei/erst-dbg.c
+++ b/drivers/acpi/apei/erst-dbg.c
@@ -213,6 +213,10 @@ static struct miscdevice erst_dbg_dev = {
 
 static __init int erst_dbg_init(void)
 {
+       if (erst_disable) {
+               pr_info(ERST_DBG_PFX "ERST support is disabled.\n");
+               return -ENODEV;
+       }
        return misc_register(&erst_dbg_dev);
 }