Merge branch 'stable/for-linus-4.20' of git://git.kernel.org/pub/scm/linux/kernel...

Pull xen swiotlb fix from Konrad Rzeszutek Wilk:
 "One tiny fix for the Xen SWIOTLB mechanism that occasionally happened
  with devices that didn't allocate size in power of two but rather some
  odd sizes.

  We neglected to make the memory coherent leading to all kinds of fun
  crashes"

* 'stable/for-linus-4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  xen-swiotlb: use actually allocated size on check physical continuous

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 28819a0e61d0c7c82e87da1165ad91ec4fbe38b2..f5c1af4ce9abb550083d2cae04a4e19a485cbcdc 100644 (file)
--- 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);