ibm_rtl: _RTL_ is not available in UEFI mode

Some of the IBM servers that are supported by ibm_rtl
can run in both Legacy mode (BIOS) and in UEFI mode.
When running in UEFI mode, it is possible that the
EBDA table exists but cannot be mapped and reports
errors.  We need to make sure that by default we don't
try to probe the machines if they are running in UEFI
mode.

Signed-off-by: Vernon Mauery <vernux@us.ibm.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/ibm_rtl.c b/drivers/platform/x86/ibm_rtl.c
index 5c975edb3c81befd6c0f5b4bb7f20c1255f7ec16..94a114aa8e286fd5fc91f97d8c7b416204c19ea2 100644 (file)
--- a/drivers/platform/x86/ibm_rtl.c
+++ b/drivers/platform/x86/ibm_rtl.c
@@ -28,6 +28,7 @@
 #include <linux/io.h>
 #include <linux/sysdev.h>
 #include <linux/dmi.h>
+#include <linux/efi.h>
 #include <linux/mutex.h>
 #include <asm/bios_ebda.h>
 
@@ -238,7 +239,7 @@ static int __init ibm_rtl_init(void) {
        if (force)
                pr_warning("ibm-rtl: module loaded by force\n");
        /* first ensure that we are running on IBM HW */
-       else if (!dmi_check_system(ibm_rtl_dmi_table))
+       else if (efi_enabled || !dmi_check_system(ibm_rtl_dmi_table))
                return -ENODEV;
 
        /* Get the address for the Extended BIOS Data Area */