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| author | Antonino A. Daplas <adaplas@gmail.com> | 2005-12-13 07:17:21 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-13 07:31:17 +0100 |
| commit | be0d9b6c7aeaad1683059c00131cabd4c894c17c (patch) | |
| tree | f7e55af855531331113cbddb98688f3901d48425 /drivers/video/cfbfillrect.c | |
| parent | [PATCH] fbdev: Shift pixel value before entering loop in cfbimageblit (diff) | |
| download | linux-be0d9b6c7aeaad1683059c00131cabd4c894c17c.tar.xz linux-be0d9b6c7aeaad1683059c00131cabd4c894c17c.zip | |
[PATCH] fbdev: Fix incorrect unaligned access in little-endian machines
The drawing function cfbfillrect does not work correctly when access is not
unsigned-long aligned. It manifests as extra lines of pixels that are not
complete drawn. Reversing the shift operator solves the problem, so I would
presume that this bug would manifest only on little endian machines. The
function cfbcopyarea may also have this bug.
Aligned access should present no problems.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/cfbfillrect.c')
| -rw-r--r-- | drivers/video/cfbfillrect.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/video/cfbfillrect.c b/drivers/video/cfbfillrect.c index 167d9314e6eb..e5ff62e9cfb8 100644 --- a/drivers/video/cfbfillrect.c +++ b/drivers/video/cfbfillrect.c @@ -110,8 +110,8 @@ bitfill_aligned(unsigned long __iomem *dst, int dst_idx, unsigned long pat, unsi if (!n) return; - first = ~0UL >> dst_idx; - last = ~(~0UL >> ((dst_idx+n) % bits)); + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); if (dst_idx+n <= bits) { // Single word @@ -167,8 +167,8 @@ bitfill_unaligned(unsigned long __iomem *dst, int dst_idx, unsigned long pat, if (!n) return; - first = ~0UL >> dst_idx; - last = ~(~0UL >> ((dst_idx+n) % bits)); + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); if (dst_idx+n <= bits) { // Single word @@ -221,8 +221,8 @@ bitfill_aligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat, if (!n) return; - first = ~0UL >> dst_idx; - last = ~(~0UL >> ((dst_idx+n) % bits)); + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); if (dst_idx+n <= bits) { // Single word @@ -290,8 +290,8 @@ bitfill_unaligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat if (!n) return; - first = ~0UL >> dst_idx; - last = ~(~0UL >> ((dst_idx+n) % bits)); + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); if (dst_idx+n <= bits) { // Single word |