linux-kernel - [tip:x86/apic] iommu/irq_remapping: Refine function irq_remapping

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Message-ID: <tip-30969e34ae6edf10a003f6c0be1fecf6dadcd421@git.kernel.org>
Date:	Thu, 15 Jan 2015 05:03:00 -0800
From:	tip-bot for Jiang Liu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	benh@...nel.crashing.org, tony.luck@...el.com, joro@...tes.org,
	yinghai@...nel.org, mingo@...nel.org, hpa@...or.com,
	tglx@...utronix.de, bp@...en8.de, linux-kernel@...r.kernel.org,
	jiang.liu@...ux.intel.com
Subject: [tip:x86/apic] iommu/irq_remapping:
  Refine function irq_remapping_prepare() for maintenance

Commit-ID:  30969e34ae6edf10a003f6c0be1fecf6dadcd421
Gitweb:     http://git.kernel.org/tip/30969e34ae6edf10a003f6c0be1fecf6dadcd421
Author:     Jiang Liu <jiang.liu@...ux.intel.com>
AuthorDate: Wed, 7 Jan 2015 15:31:41 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 15 Jan 2015 11:24:24 +0100

iommu/irq_remapping: Refine function irq_remapping_prepare() for maintenance

Assign intel_irq_remap_ops to remap_ops only if
intel_irq_remap_ops.prepare() succeeds.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Tested-by: Joerg Roedel <joro@...tes.org>
Cc: Tony Luck <tony.luck@...el.com>
Cc: iommu@...ts.linux-foundation.org
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Link: http://lkml.kernel.org/r/1420615903-28253-15-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/iommu/irq_remapping.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index e7449b4..7d85d2b 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -204,15 +204,15 @@ int __init irq_remapping_prepare(void)
 	if (disable_irq_remap)
 		return -ENOSYS;
 
-	remap_ops = &intel_irq_remap_ops;
-
-#ifdef CONFIG_AMD_IOMMU
-	if (amd_iommu_irq_ops.prepare() == 0) {
+	if (intel_irq_remap_ops.prepare() == 0)
+		remap_ops = &intel_irq_remap_ops;
+	else if (IS_ENABLED(CONFIG_AMD_IOMMU) &&
+		 amd_iommu_irq_ops.prepare() == 0)
 		remap_ops = &amd_iommu_irq_ops;
-		return 0;
-	}
-#endif
-	return remap_ops->prepare();
+	else
+		return -ENOSYS;
+
+	return 0;
 }
 
 int __init irq_remapping_enable(void)
--
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