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| author | Souptick Joarder <jrdr.linux@gmail.com> | 2019-05-26 18:11:10 +0200 |
|---|---|---|
| committer | Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> | 2019-06-20 15:06:24 +0200 |
| commit | f4bb1f895aa07dfcb96169192ff7c9154620df87 (patch) | |
| tree | e5d8d73d37c870727faa14cf2c45d25f02d6c72b /drivers | |
| parent | auxdisplay/cfag12864bfb.c: Convert to use vm_map_pages_zero() (diff) | |
| download | linux-f4bb1f895aa07dfcb96169192ff7c9154620df87.tar.xz linux-f4bb1f895aa07dfcb96169192ff7c9154620df87.zip | |
auxdisplay/ht16k33.c: Convert to use vm_map_pages_zero()
While using mmap, the incorrect values of length and vm_pgoff are
ignored and this driver goes 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>
Acked-by: Robin van der Gracht <robin@protonic.nl>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/auxdisplay/ht16k33.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c index 21393ec3b9a4..9c0bb771751d 100644 --- a/drivers/auxdisplay/ht16k33.c +++ b/drivers/auxdisplay/ht16k33.c @@ -223,9 +223,9 @@ static const struct backlight_ops ht16k33_bl_ops = { 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 = { |