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| author | Antonino A. Daplas <adaplas@gmail.com> | 2005-12-12 22:17:21 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-12 22:31:17 -0800 |
| commit | be0d9b6c7aeaad1683059c00131cabd4c894c17c (patch) | |
| tree | f7e55af855531331113cbddb98688f3901d48425 /drivers/video/cfbcopyarea.c | |
| parent | 7275b4b6bc2f783c135c3f0eeecc4fdc6e788aa8 (diff) | |
| download | lwn-be0d9b6c7aeaad1683059c00131cabd4c894c17c.tar.gz lwn-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/cfbcopyarea.c')
| -rw-r--r-- | drivers/video/cfbcopyarea.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/video/cfbcopyarea.c b/drivers/video/cfbcopyarea.c index cdc71572cf35..74415325b016 100644 --- a/drivers/video/cfbcopyarea.c +++ b/drivers/video/cfbcopyarea.c @@ -64,8 +64,8 @@ bitcpy(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src int const shift = dst_idx-src_idx; int left, right; - 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 (!shift) { // Same alignment for source and dest @@ -216,8 +216,8 @@ bitcpy_rev(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem shift = dst_idx-src_idx; - first = ~0UL << (bits - 1 - dst_idx); - last = ~(~0UL << (bits - 1 - ((dst_idx-n) % bits))); + first = FB_SHIFT_LOW(~0UL, bits - 1 - dst_idx); + last = ~(FB_SHIFT_LOW(~0UL, bits - 1 - ((dst_idx-n) % bits))); if (!shift) { // Same alignment for source and dest |