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authorAntonino A. Daplas <adaplas@gmail.com>2005-12-13 09:17:21 +0300
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-13 09:31:17 +0300
commitbe0d9b6c7aeaad1683059c00131cabd4c894c17c (patch)
treef7e55af855531331113cbddb98688f3901d48425 /drivers/video/cfbfillrect.c
parent7275b4b6bc2f783c135c3f0eeecc4fdc6e788aa8 (diff)
downloadlinux-be0d9b6c7aeaad1683059c00131cabd4c894c17c.tar.xz
[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.c16
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