Commit 7915cb5b authored Oct 09, 2019 by Prakash Gupta

iommu: dma-mapping-fast: fix iova alloc wrap



In case of iova_alloc bitmap search wrap, we erroneously update the
previous_next_start as 0, this causes stale tlb logic not detect wrap and
stale TLB entry issues. Fix the same.

Change-Id: Ic8c96e98abc91520f222a7dbe5024814dabd5042
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>

parent 692654ff

drivers/iommu/dma-mapping-fast.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -181,7 +181,6 @@ static dma_addr_t __fast_smmu_alloc_iova(struct dma_fast_smmu_mapping *mapping,
		nbits, align);
		if (unlikely(bit > mapping->num_4k_pages)) {
		/* try wrapping */
		mapping->next_start = 0; /* TODO: SHOULD I REALLY DO THIS?!? */
		bit = bitmap_find_next_zero_area(
		mapping->bitmap, mapping->num_4k_pages, 0, nbits,
		align);