linux-kernel - [PATCH 5.4 368/434] iommu: set group default domain before creating direct mappings

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Date:   Sun, 29 Dec 2019 18:27:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        Jerry Snitselaar <jsnitsel@...hat.com>
Subject: [PATCH 5.4 368/434] iommu: set group default domain before creating direct mappings

From: Jerry Snitselaar <jsnitsel@...hat.com>

commit d360211524bece6db9920f32c91808235290b51c upstream.

iommu_group_create_direct_mappings uses group->default_domain, but
right after it is called, request_default_domain_for_dev calls
iommu_domain_free for the default domain, and sets the group default
domain to a different domain. Move the
iommu_group_create_direct_mappings call to after the group default
domain is set, so the direct mappings get associated with that domain.

Cc: Joerg Roedel <jroedel@...e.de>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: iommu@...ts.linux-foundation.org
Cc: stable@...r.kernel.org
Fixes: 7423e01741dd ("iommu: Add API to request DMA domain for device")
Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/iommu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2221,13 +2221,13 @@ request_default_domain_for_dev(struct de
 		goto out;
 	}
 
-	iommu_group_create_direct_mappings(group, dev);
-
 	/* Make the domain the default for this group */
 	if (group->default_domain)
 		iommu_domain_free(group->default_domain);
 	group->default_domain = domain;
 
+	iommu_group_create_direct_mappings(group, dev);
+
 	dev_info(dev, "Using iommu %s mapping\n",
 		 type == IOMMU_DOMAIN_DMA ? "dma" : "direct");