[Patch v2] iommu/vt-d: Adjsut the return value of the parse_ioapics_under_ir

[Baoquan He <bhe@redhat.com>]

Adjust the return value of parse_ioapics_under_ir as negative value 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 <bhe@redhat.com>
---
v1->v2:
    Drop the patch 2/1 of v1 patchset since it's a wrong patch.
    Joerg suggested that replace "-1" with "-ENODEV" which is more specific.

 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 9ec4e0d..12b11be 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;
 	}
@@ -916,7 +916,7 @@ static int __init parse_ioapics_under_ir(void)
 		}
 
 	if (!ir_supported)
-		return 0;
+		return -ENODEV;
 
 	for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) {
 		int ioapic_id = mpc_ioapic_id(ioapic_idx);
@@ -928,7 +928,7 @@ static int __init parse_ioapics_under_ir(void)
 		}
 	}
 
-	return 1;
+	return 0;
 }
 
 static int __init ir_dev_scope_init(void)
-- 
2.1.0