Adjust the return value of parse_ioapics_under_ir as "-1" representing
failure and "0" representing succcess. Just make it consistent with other
function implementation, and we can judge if calling is successfull by
if (!parse_ioapics_under_ir()) style.

Signed-off-by: Baoquan He <[email protected]>
---
 drivers/iommu/intel_irq_remapping.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel_irq_remapping.c 
b/drivers/iommu/intel_irq_remapping.c
index 37b93f5..0f441b7 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -672,7 +672,7 @@ static int __init intel_prepare_irq_remapping(void)
        if (!dmar_ir_support())
                return -ENODEV;
 
-       if (parse_ioapics_under_ir() != 1) {
+       if (!parse_ioapics_under_ir()) {
                pr_info("Not enabling interrupt remapping\n");
                goto error;
        }
@@ -918,7 +918,7 @@ static int __init parse_ioapics_under_ir(void)
                }
 
        if (!ir_supported)
-               return 0;
+               return -1;
 
        for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) {
                int ioapic_id = mpc_ioapic_id(ioapic_idx);
@@ -930,7 +930,7 @@ static int __init parse_ioapics_under_ir(void)
                }
        }
 
-       return 1;
+       return 0;
 }
 
 static int __init ir_dev_scope_init(void)
-- 
2.1.0

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