[RFC, BUGFIX] ACPI, APEI, ERST, Prevent erst_dbg from loading if ERST is disabled

[Huang Ying]

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

Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
---
 drivers/acpi/apei/erst-dbg.c |    4 ++++
 1 file changed, 4 insertions(+)

--- 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);
 }
 
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