linux-kernel - [PATCH 1/5] iommu/vt-d: Allocate IRQ remapping data structures only for all IOMMUs

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Date:	Mon, 15 Dec 2014 16:13:20 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, hpa@...or.com, x86@...nel.org,
	Joerg Roedel <joro@...tes.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>
Cc:	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 1/5] iommu/vt-d: Allocate IRQ remapping data structures only for all IOMMUs

From: Joerg Roedel <jroedel@...e.de>

IRQ remapping is only supported when all IOMMUs in the
system support it. So check if all IOMMUs in the system
support IRQ remapping before doing the allocations.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/intel_irq_remapping.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index ff35b03..3ef63b8 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -568,14 +568,16 @@ static int __init intel_prepare_irq_remapping(void)
 		goto error;
 	}
 
-	for_each_iommu(iommu, drhd) {
+	/* First make sure all IOMMUs support IRQ remapping */
+	for_each_iommu(iommu, drhd)
 		if (!ecap_ir_support(iommu->ecap))
-			continue;
+			goto error;
 
-		/* Do the allocations early */
+	/* Do the allocations early */
+	for_each_iommu(iommu, drhd)
 		if (intel_setup_irq_remapping(iommu))
 			goto error;
-	}
+
 	return 0;
 error:
 	intel_cleanup_irq_remapping();
-- 
1.9.1

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