linux-kernel - [PATCH 2/2] vfio: type1: conditionally check MSI remapping at irq domain level

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Message-Id: <20170302100132.20502-2-yousaf.kaukab@suse.com>
Date:   Thu,  2 Mar 2017 11:01:32 +0100
From:   Mian Yousaf Kaukab <yousaf.kaukab@...e.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        marc.zyngier@....com, alex.williamson@...hat.com
Cc:     eric.auger@...hat.com, will.deacon@....com,
        Mian Yousaf Kaukab <yousaf.kaukab@...e.com>
Subject: [PATCH 2/2] vfio: type1: conditionally check MSI remapping at irq domain level

Check only if irq domains are available.

Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@...e.com>
---
 drivers/vfio/vfio_iommu_type1.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index bd6f293c4ebd..e3ed50e40ead 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1287,8 +1287,9 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
 	INIT_LIST_HEAD(&domain->group_list);
 	list_add(&group->next, &domain->group_list);
 
-	msi_remap = resv_msi ? irq_domain_check_msi_remap() :
-				iommu_capable(bus, IOMMU_CAP_INTR_REMAP);
+	msi_remap = resv_msi && IS_ENABLED(CONFIG_IRQ_DOMAIN) ?
+			irq_domain_check_msi_remap() :
+			iommu_capable(bus, IOMMU_CAP_INTR_REMAP);
 
 	if (!allow_unsafe_interrupts && !msi_remap) {
 		pr_warn("%s: No interrupt remapping support.  Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
-- 
2.11.0