Messages in this thread | | | Date | Tue, 21 May 2019 08:55:47 +0200 | From | Robin van der Gracht <> | Subject | Re: [PATCH 2/2] auxdisplay/ht16k33.c: Convert to use vm_map_pages_zero() |
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On Mon, 20 May 2019 21:00:58 +0530 Souptick Joarder <jrdr.linux@gmail.com> wrote:
> While using mmap, the incorrect value of length and vm_pgoff are > ignored and this driver go ahead with mapping fbdev.buffer > to user vma. > > Convert vm_insert_pages() to use vm_map_pages_zero(). We could later > "fix" these drivers to behave according to the normal vm_pgoff > offsetting simply by removing the _zero suffix on the function name > and if that causes regressions, it gives us an easy way to revert. > > Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com> > --- > drivers/auxdisplay/ht16k33.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c > index 21393ec..9c0bb77 100644 > --- a/drivers/auxdisplay/ht16k33.c > +++ b/drivers/auxdisplay/ht16k33.c > @@ -223,9 +223,9 @@ static int ht16k33_bl_check_fb(struct backlight_device *bl, struct fb_info *fi) > static int ht16k33_mmap(struct fb_info *info, struct vm_area_struct *vma) > { > struct ht16k33_priv *priv = info->par; > + struct page *pages = virt_to_page(priv->fbdev.buffer); > > - return vm_insert_page(vma, vma->vm_start, > - virt_to_page(priv->fbdev.buffer)); > + return vm_map_pages_zero(vma, &pages, 1); > } > > static struct fb_ops ht16k33_fb_ops = {
Acked-by: Robin van der Gracht <robin@protonic.nl>
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