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drm/fb-helper: Fix clip rectangle height

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Computing the clip rectangle is prone to off-by-one errors when writes
happen near the end of a memory page. Point the end of the memory area
to the first trailing byte, so that (end - start) returns the area's
length.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220209161617.3553-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2022-02-09 17:16:13 +01:00
parent f5666d4823
commit a3c286dcef
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_fb_helper.c
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@ -699,7 +699,7 @@ void drm_fb_helper_deferred_io(struct fb_info *info,
max = 0;
list_for_each_entry(page, pagelist, lru) {
start = page->index << PAGE_SHIFT;
end = start + PAGE_SIZE - 1;
end = start + PAGE_SIZE;
min = min(min, start);
max = max(max, end);
}