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| author | James Hogan <james@albanarts.com> | 2010-10-27 15:33:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-27 18:03:08 -0700 |
| commit | f11b478d461b7113eb4603b3914aaf15b7788e87 (patch) | |
| tree | 84e673927a071c64658d8b24ae423de86948b573 /include | |
| parent | c9c62dce35e7fc54beebafb071393a0008989e49 (diff) | |
| download | linux-f11b478d461b7113eb4603b3914aaf15b7788e87.tar.gz linux-f11b478d461b7113eb4603b3914aaf15b7788e87.tar.bz2 linux-f11b478d461b7113eb4603b3914aaf15b7788e87.zip | |
fbmem: fix fb_read, fb_write unaligned accesses
fb_{read,write} access the framebuffer using lots of fb_{read,write}l's
but don't check that the file position is aligned which can cause problems
on some architectures which do not support unaligned accesses.
Since the operations are essentially memcpy_{from,to}io, new
fb_memcpy_{from,to}fb macros have been defined and these are used instead.
For Sparc, fb_{read,write} macros use sbus_{read,write}, so this defines
new sbus_memcpy_{from,to}io functions the same as memcpy_{from,to}io but
using sbus_{read,write}b instead of {read,write}b.
Signed-off-by: James Hogan <james@albanarts.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fb.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/fb.h b/include/linux/fb.h index f0268deca658..7fca3dc4e475 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -931,6 +931,8 @@ static inline struct apertures_struct *alloc_apertures(unsigned int max_num) { #define fb_writel sbus_writel #define fb_writeq sbus_writeq #define fb_memset sbus_memset_io +#define fb_memcpy_fromfb sbus_memcpy_fromio +#define fb_memcpy_tofb sbus_memcpy_toio #elif defined(__i386__) || defined(__alpha__) || defined(__x86_64__) || defined(__hppa__) || defined(__sh__) || defined(__powerpc__) || defined(__avr32__) || defined(__bfin__) @@ -943,6 +945,8 @@ static inline struct apertures_struct *alloc_apertures(unsigned int max_num) { #define fb_writel __raw_writel #define fb_writeq __raw_writeq #define fb_memset memset_io +#define fb_memcpy_fromfb memcpy_fromio +#define fb_memcpy_tofb memcpy_toio #else @@ -955,6 +959,8 @@ static inline struct apertures_struct *alloc_apertures(unsigned int max_num) { #define fb_writel(b,addr) (*(volatile u32 *) (addr) = (b)) #define fb_writeq(b,addr) (*(volatile u64 *) (addr) = (b)) #define fb_memset memset +#define fb_memcpy_fromfb memcpy +#define fb_memcpy_tofb memcpy #endif |