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Commit e16d24ba authored by Robin Murphy's avatar Robin Murphy Committed by Patrick Daly
Browse files

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.

Change-Id: I013e6b1b10abbe63f5e7e6ae29e91a0b903a59a0
Signed-off-by: default avatarRobin Murphy <robin.murphy@arm.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Git-commit: 56c1dd5f6c0adb99aba0594881bb1d8ec32cd5b4
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent 9e700121

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 {