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[PATCH] fbdev: Fix incorrect unaligned access in little-endian machines

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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>
This commit is contained in:
Antonino A. Daplas
2005-12-12 22:17:21 -08:00
committed by Linus Torvalds
parent 7275b4b6bc
commit be0d9b6c7a
4 changed files with 36 additions and 36 deletions
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16
drivers/video/cfbfillrect.c
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@@ -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