xen_swiotlb_{alloc,free}_coherent() allocate/free memory by order,
but passed required size to range_straddles_page_boundary(),
when first pages are physical continuous,
range_straddles_page_boundary() returned true, then did not
exchanged memory with Xen, later on free memory, it tried to
exchanged non-contiguous memory with Xen, then kernel panic.
Signed-off-by: Joe Jin <joe....@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Cc: Boris Ostrovsky <boris.ostrov...@oracle.com>
Cc: Christoph Helwig <h...@lst.de>
Cc: Dongli Zhang <dongli.zh...@oracle.com>
Cc: John Sobecki <john.sobe...@oracle.com>
---
drivers/xen/swiotlb-xen.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index a6f9ba85dc4b..aa081f806728 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -303,6 +303,9 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t
size,
*/
flags &= ~(__GFP_DMA | __GFP_HIGHMEM);
+ /* Convert the size to actually allocated. */
+ size = 1UL << (order + XEN_PAGE_SHIFT);
+
/* On ARM this function returns an ioremap'ped virtual address for
* which virt_to_phys doesn't return the corresponding physical
* address. In fact on ARM virt_to_phys only works for kernel direct
@@ -351,6 +354,9 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t
size, void *vaddr,
* physical address */
phys = xen_bus_to_phys(dev_addr);
+ /* Convert the size to actually allocated. */
+ size = 1UL << (order + XEN_PAGE_SHIFT);
+
if (((dev_addr + size - 1 <= dma_mask)) ||
range_straddles_page_boundary(phys, size))
xen_destroy_contiguous_region(phys, order);
--
2.15.2 (Apple Git-101.1)
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