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| author | Paul Mackerras <paulus@samba.org> | 2005-05-20 16:50:55 +1000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-20 07:54:10 -0700 |
| commit | 72480ef863740c3dc301b0803c9ed6d10716aa11 (patch) | |
| tree | 958a49f87b40c6a208d95f85e5e93f2f39b77d3d /arch/ppc/lib/string.S | |
| parent | 3207a80a6e11c7ceff7e46d5ec6bfcc03c14e729 (diff) | |
| download | lwn-72480ef863740c3dc301b0803c9ed6d10716aa11.tar.gz lwn-72480ef863740c3dc301b0803c9ed6d10716aa11.zip | |
[PATCH] ppc32: Fix __copy_tofrom_user return value
Recently the __copy_tofrom_user routine was modified to avoid doing
prefetches past the end of the source array. However, in doing so we
introduced a bug in that it now returns the wrong value for the number
of bytes not copied when a fault is encountered. This fixes it to
return the correct number.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc/lib/string.S')
| -rw-r--r-- | arch/ppc/lib/string.S | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/ppc/lib/string.S b/arch/ppc/lib/string.S index 8d08a2eb225e..36c9b97fd92a 100644 --- a/arch/ppc/lib/string.S +++ b/arch/ppc/lib/string.S @@ -446,6 +446,7 @@ _GLOBAL(__copy_tofrom_user) #ifdef CONFIG_8xx /* Don't use prefetch on 8xx */ mtctr r0 + li r0,0 53: COPY_16_BYTES_WITHEX(0) bdnz 53b @@ -564,7 +565,9 @@ _GLOBAL(__copy_tofrom_user) /* or write fault in cacheline loop */ 105: li r9,1 92: li r3,LG_CACHELINE_BYTES - b 99f + mfctr r8 + add r0,r0,r8 + b 106f /* read fault in final word loop */ 108: li r9,0 b 93f @@ -585,7 +588,7 @@ _GLOBAL(__copy_tofrom_user) * r5 + (ctr << r3), and r9 is 0 for read or 1 for write. */ 99: mfctr r0 - slw r3,r0,r3 +106: slw r3,r0,r3 add. r3,r3,r5 beq 120f /* shouldn't happen */ cmpwi 0,r9,0 |