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SubjectRe: [PATCH 2/9] arch/arm/mm/dma-mapping.c: Convert to use vm_insert_range
On Fri, Jan 25, 2019 at 11:54 AM Souptick Joarder <jrdr.linux@gmail.com> wrote:
>
> On Fri, Jan 11, 2019 at 8:33 PM Souptick Joarder <jrdr.linux@gmail.com> wrote:
> >
> > Convert to use vm_insert_range() to map range of kernel
> > memory to user vma.
> >
> > Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
>
> Any comment on this patch ?

Any comment on this patch ?

>
> > ---
> > arch/arm/mm/dma-mapping.c | 22 ++++++----------------
> > 1 file changed, 6 insertions(+), 16 deletions(-)
> >
> > diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> > index 78de138..5334391 100644
> > --- a/arch/arm/mm/dma-mapping.c
> > +++ b/arch/arm/mm/dma-mapping.c
> > @@ -1582,31 +1582,21 @@ static int __arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma
> > void *cpu_addr, dma_addr_t dma_addr, size_t size,
> > unsigned long attrs)
> > {
> > - unsigned long uaddr = vma->vm_start;
> > - unsigned long usize = vma->vm_end - vma->vm_start;
> > struct page **pages = __iommu_get_pages(cpu_addr, attrs);
> > unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
> > - unsigned long off = vma->vm_pgoff;
> > + int err;
> >
> > if (!pages)
> > return -ENXIO;
> >
> > - if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
> > + if (vma->vm_pgoff >= nr_pages)
> > return -ENXIO;
> >
> > - pages += off;
> > -
> > - do {
> > - int ret = vm_insert_page(vma, uaddr, *pages++);
> > - if (ret) {
> > - pr_err("Remapping memory failed: %d\n", ret);
> > - return ret;
> > - }
> > - uaddr += PAGE_SIZE;
> > - usize -= PAGE_SIZE;
> > - } while (usize > 0);
> > + err = vm_insert_range(vma, pages, nr_pages);
> > + if (err)
> > + pr_err("Remapping memory failed: %d\n", err);
> >
> > - return 0;
> > + return err;
> > }
> > static int arm_iommu_mmap_attrs(struct device *dev,
> > struct vm_area_struct *vma, void *cpu_addr,
> > --
> > 1.9.1
> >

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