linux-kernel - [02/89] intel-iommu: Flush unmaps at domain

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Date:	Wed, 15 Jun 2011 16:59:25 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Alex Williamson <alex.williamson@...hat.com>,
	David Woodhouse <David.Woodhouse@...el.com>
Subject: [02/89] intel-iommu: Flush unmaps at domain_exit

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Alex Williamson <alex.williamson@...hat.com>

commit 7b668357810ecb5fdda4418689d50f5d95aea6a8 upstream.

We typically batch unmaps to be lazily flushed out at
regular intervals.  When we destroy a domain, we need
to force a flush of these lazy unmaps to be sure none
reference the domain we're about to free.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=35062
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1416,6 +1416,10 @@ static void domain_exit(struct dmar_doma
 	if (!domain)
 		return;
 
+	/* Flush any lazy unmaps that may reference this domain */
+	if (!intel_iommu_strict)
+		flush_unmaps_timeout(0);
+
 	domain_remove_dev_info(domain);
 	/* destroy iovas */
 	put_iova_domain(&domain->iovad);


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