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Merge branch 'stable/for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb 

Pull swiotlb fix from Konrad Rzeszutek Wilk:
 "A tiny fix to make sure that page-sized mappings are page-aligned (and
  not say straddle two pages). This is important for some drivers (such
  as NVME)"

* 'stable/for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: ensure that page-sized mappings are page-aligned
This commit is contained in:
Linus Torvalds 2017-01-17 09:27:50 -08:00
parent 7e84b30355 602d9858f0
commit 203f80f1c4
1 changed files with 3 additions and 3 deletions
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6
lib/swiotlb.c
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@ -483,11 +483,11 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
: 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
/*
* For mappings greater than a page, we limit the stride (and
* hence alignment) to a page size.
* For mappings greater than or equal to a page, we limit the stride
* (and hence alignment) to a page size.
*/
nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
if (size > PAGE_SIZE)
if (size >= PAGE_SIZE)
stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
else
stride = 1;