[Xen-changelog] [xen master] ACPI: disable ACPI cleanly when bad RSDP found

[patchbot@xxxxxxx]

commit 0f09ae7bcbef680c9a6edb816557d1af4179b591
Author:     Len Brown <len.brown@xxxxxxxxx>
AuthorDate: Wed Sep 9 16:26:12 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 9 16:26:12 2015 +0200

    ACPI: disable ACPI cleanly when bad RSDP found
    
    When ACPI is disabled in the BIOS of this VIA C3 box,
    it invalidates the RSDP, which Linux notices:
    
    ACPI Error (tbxfroot-0218): A valid RSDP was not found [20080926]
    
    Bug Linux neglected to disable ACPI at that stage,
    and later scribbled on smp_found_config:
    
    ACPI: No APIC-table, disabling MPS
    
    But this box doesn't run well in legacy PIC mode,
    it needed IOAPIC mode to perform correctly:
    
    http://lkml.org/lkml/2009/2/5/39
    
    So exit ACPI mode cleanly when we first detect
    that it is hopeless.
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
    [Linux commit 9e3a9d1ed8cc8db93e5c53e9a5b09065bd95de8b]
    Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 xen/drivers/acpi/tables.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/xen/drivers/acpi/tables.c b/xen/drivers/acpi/tables.c
index 1da2127..6085fda 100644
--- a/xen/drivers/acpi/tables.c
+++ b/xen/drivers/acpi/tables.c
@@ -329,7 +329,12 @@ static void __init check_multiple_madt(void)
 
 int __init acpi_table_init(void)
 {
-       acpi_initialize_tables(NULL, ACPI_MAX_TABLES, 0);
+       acpi_status status;
+
+       status = acpi_initialize_tables(NULL, ACPI_MAX_TABLES, 0);
+       if (ACPI_FAILURE(status))
+               return 1;
+
        check_multiple_madt();
        return 0;
 }
--
generated by git-patchbot for /home/xen/git/xen.git#master

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