[02/89] intel-iommu: Flush unmaps at domain_exit

From: Greg KH
Date: Thu Jun 16 2011 - 03:43:07 EST

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


From: Alex Williamson <alex.williamson@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: David Woodhouse <David.Woodhouse@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

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)

+ /* Flush any lazy unmaps that may reference this domain */
+ if (!intel_iommu_strict)
+ flush_unmaps_timeout(0);
/* destroy iovas */

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