[PATCH] Fix UV4 Hub Revision adjustment

[Mike Travis]

Fix UV4 Hub Revision adjustment as Hub chip starts with revision 1.
Incorrectly identifies UV4 as UV4A and UV4A as UV5.

Fixes 647128f1536ef: x86/platform/uv: Update UV MMRs for UV5

Signed-off-by: Mike Travis <mike.tra...@hpe.com>
Acked-by: Dimitri Sivanich <dimitri.sivan...@hpe.com>
---
 arch/x86/kernel/apic/x2apic_uv_x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c 
b/arch/x86/kernel/apic/x2apic_uv_x.c
index 1b98f8c12b96..235f5cde06fc 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -161,7 +161,7 @@ static int __init early_set_hub_type(void)
        /* UV4/4A only have a revision difference */
        case UV4_HUB_PART_NUMBER:
                uv_min_hub_revision_id = node_id.s.revision
-                                        + UV4_HUB_REVISION_BASE;
+                                        + UV4_HUB_REVISION_BASE - 1;
                uv_hub_type_set(UV4);
                if (uv_min_hub_revision_id == UV4A_HUB_REVISION_BASE)
                        uv_hub_type_set(UV4|UV4A);
-- 
2.21.0