linux-kernel - [RFC Patch V1 8/9] iommu/irq_remapping: Normailize the way to detect whether IR is enabled

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Date:	Wed, 10 Dec 2014 14:47:50 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Borislav Petkov <bp@...en8.de>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>,
	iommu@...ts.linux-foundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC Patch V1 8/9] iommu/irq_remapping: Normailize the way to detect whether IR is enabled

Refine code by normailizing the way to detect whether IR is enabled.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/iommu/irq_remapping.c |   30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index fbd585e49ebd..c7ef51a2555a 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -112,22 +112,16 @@ int __init irq_remapping_enable(void)
 
 void irq_remapping_disable(void)
 {
-	if (!irq_remapping_enabled ||
-	    !remap_ops ||
-	    !remap_ops->disable)
-		return;
-
-	remap_ops->disable();
+	if (irq_remapping_enabled && remap_ops->disable)
+		remap_ops->disable();
 }
 
 int irq_remapping_reenable(int mode)
 {
-	if (!irq_remapping_enabled ||
-	    !remap_ops ||
-	    !remap_ops->reenable)
-		return 0;
+	if (irq_remapping_enabled && remap_ops->reenable)
+		return remap_ops->reenable(mode);
 
-	return remap_ops->reenable(mode);
+	return 0;
 }
 
 int __init irq_remap_enable_fault_handling(void)
@@ -135,7 +129,7 @@ int __init irq_remap_enable_fault_handling(void)
 	if (!irq_remapping_enabled)
 		return 0;
 
-	if (!remap_ops || !remap_ops->enable_faulting)
+	if (!remap_ops->enable_faulting)
 		return -ENODEV;
 
 	return remap_ops->enable_faulting();
@@ -176,10 +170,10 @@ void irq_remapping_print_chip(struct irq_data *data, struct seq_file *p)
 struct irq_domain *
 irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
 {
-	if (!remap_ops || !remap_ops->get_ir_irq_domain)
-		return NULL;
+	if (irq_remapping_enabled && remap_ops->get_ir_irq_domain)
+		return remap_ops->get_ir_irq_domain(info);
 
-	return remap_ops->get_ir_irq_domain(info);
+	return NULL;
 }
 
 /**
@@ -194,8 +188,8 @@ irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
 struct irq_domain *
 irq_remapping_get_irq_domain(struct irq_alloc_info *info)
 {
-	if (!remap_ops || !remap_ops->get_irq_domain)
-		return NULL;
+	if (irq_remapping_enabled && remap_ops->get_irq_domain)
+		return remap_ops->get_irq_domain(info);
 
-	return remap_ops->get_irq_domain(info);
+	return NULL;
 }
-- 
1.7.10.4

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