Commit 62280cf2 authored Nov 11, 2016 by Robin Murphy Committed by Joerg Roedel Nov 15, 2016

iommu/iova: Extend cached node lookup condition

When searching for a free IOVA range, we optimise the tree traversal
by starting from the cached32_node, instead of the last node, when
limit_pfn is equal to dma_32bit_pfn. However, if limit_pfn happens to
be smaller, then we'll go ahead and start from the top even though
dma_32bit_pfn is still a more suitable upper bound. Since this is
clearly a silly thing to do, adjust the lookup condition appropriately.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent 5d1d43b0

drivers/iommu/iova.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -56,7 +56,7 @@ EXPORT_SYMBOL_GPL(init_iova_domain);
		static struct rb_node *
		__get_cached_rbnode(struct iova_domain iovad, unsigned long limit_pfn)
		{
		if ((*limit_pfn != iovad->dma_32bit_pfn) \|\|
		if ((*limit_pfn > iovad->dma_32bit_pfn) \|\|
		(iovad->cached32_node == NULL))
		return rb_last(&iovad->rbroot);
		else {

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