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| author | George G. Davis <george_davis@mentor.com> | 2016-09-28 10:51:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-28 18:53:16 +0300 |
| commit | 9ca5d4fd08d1c560a46ff649221a891065039891 (patch) | |
| tree | e81dfaa7f9347ed4b15d0dc1897acda838c0a8c9 /drivers/base | |
| parent | e7604239c1c56430f1b40ebad161b23d44485c30 (diff) | |
| download | linux-9ca5d4fd08d1c560a46ff649221a891065039891.tar.xz | |
drivers: dma-coherent: Fix DMA coherent size for less than page
We fix a bug in dma_mmap_from_coherent() that appears when we map non page
aligned DMA memory. It cuts off the non aligned part (this is different to
dma_alloc_coherent() that always rounds up to full pages). So for mappings
of less than a page we get -ENXIO as dma_mmap_from_coherent() assumes we
want to map zero pages.
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Mark Craske <Mark_Craske@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/dma-coherent.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c index db122a06edc5..2789f7a95b93 100644 --- a/drivers/base/dma-coherent.c +++ b/drivers/base/dma-coherent.c @@ -262,7 +262,7 @@ int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma, unsigned long off = vma->vm_pgoff; int start = (vaddr - mem->virt_base) >> PAGE_SHIFT; int user_count = vma_pages(vma); - int count = size >> PAGE_SHIFT; + int count = PAGE_ALIGN(size) >> PAGE_SHIFT; *ret = -ENXIO; if (off < count && user_count <= count - off) { |