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authorNikita Yushchenko <nikita.yoush@cogentembedded.com>2017-01-11 21:56:31 +0300
committerKonrad Rzeszutek Wilk <konrad@kernel.org>2017-01-15 20:37:24 +0300
commit602d9858f07c72eab64f5f00e2fae55f9902cfbe (patch)
tree274545ab1eed32ac6528047ad363c169753b1f7e /lib/swiotlb.c
parent7453c549f5f6485c0d79cad7844870dcc7d1b34d (diff)
downloadlinux-602d9858f07c72eab64f5f00e2fae55f9902cfbe.tar.xz
swiotlb: ensure that page-sized mappings are page-aligned
Some drivers do depend on page mappings to be page aligned. Swiotlb already enforces such alignment for mappings greater than page, extend that to page-sized mappings as well. Without this fix, nvme hits BUG() in nvme_setup_prps(), because that routine assumes page-aligned mappings. Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
Diffstat (limited to 'lib/swiotlb.c')
-rw-r--r--lib/swiotlb.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 975b8fc4f1e1..a8d74a733a38 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -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;