diff options
author | Jeremy Kerr <jk@ozlabs.org> | 2009-02-17 00:44:14 (GMT) |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-02-22 23:48:58 (GMT) |
commit | 60ee031940c1b09c137b617a8829e2f081961fe0 (patch) | |
tree | eb61ad956dc3b6e2e4e5f7434451fddc97cda160 /arch/powerpc/platforms/cell/spu_fault.c | |
parent | 13870b657578bcce167978ee93dc02bf54e3beb0 (diff) | |
download | linux-fsl-qoriq-60ee031940c1b09c137b617a8829e2f081961fe0.tar.xz |
powerpc/spufs: Use correct return value for spu_handle_mm_fault
Currently, spu_handle_mm_fault disregards the 'ret' variable and always
returns -EFAULT on error.
This change refactos spu_handle_mm_fault a little, to return the
ret variable as appropriate. This allows us to combine the error and
sucess paths.
Also, remove the #if-0-ed IS_VALID_EA() check, it has never been
used.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/cell/spu_fault.c')
-rw-r--r-- | arch/powerpc/platforms/cell/spu_fault.c | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/arch/powerpc/platforms/cell/spu_fault.c b/arch/powerpc/platforms/cell/spu_fault.c index c8b1cd4..95d8dad 100644 --- a/arch/powerpc/platforms/cell/spu_fault.c +++ b/arch/powerpc/platforms/cell/spu_fault.c @@ -39,60 +39,56 @@ int spu_handle_mm_fault(struct mm_struct *mm, unsigned long ea, unsigned long is_write; int ret; -#if 0 - if (!IS_VALID_EA(ea)) { + if (mm == NULL) return -EFAULT; - } -#endif /* XXX */ - if (mm == NULL) { - return -EFAULT; - } - if (mm->pgd == NULL) { + + if (mm->pgd == NULL) return -EFAULT; - } down_read(&mm->mmap_sem); + ret = -EFAULT; vma = find_vma(mm, ea); if (!vma) - goto bad_area; - if (vma->vm_start <= ea) - goto good_area; - if (!(vma->vm_flags & VM_GROWSDOWN)) - goto bad_area; - if (expand_stack(vma, ea)) - goto bad_area; -good_area: + goto out_unlock; + + if (ea < vma->vm_start) { + if (!(vma->vm_flags & VM_GROWSDOWN)) + goto out_unlock; + if (expand_stack(vma, ea)) + goto out_unlock; + } + is_write = dsisr & MFC_DSISR_ACCESS_PUT; if (is_write) { if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; + goto out_unlock; } else { if (dsisr & MFC_DSISR_ACCESS_DENIED) - goto bad_area; + goto out_unlock; if (!(vma->vm_flags & (VM_READ | VM_EXEC))) - goto bad_area; + goto out_unlock; } + ret = 0; *flt = handle_mm_fault(mm, vma, ea, is_write); if (unlikely(*flt & VM_FAULT_ERROR)) { if (*flt & VM_FAULT_OOM) { ret = -ENOMEM; - goto bad_area; + goto out_unlock; } else if (*flt & VM_FAULT_SIGBUS) { ret = -EFAULT; - goto bad_area; + goto out_unlock; } BUG(); } + if (*flt & VM_FAULT_MAJOR) current->maj_flt++; else current->min_flt++; - up_read(&mm->mmap_sem); - return ret; -bad_area: +out_unlock: up_read(&mm->mmap_sem); - return -EFAULT; + return ret; } EXPORT_SYMBOL_GPL(spu_handle_mm_fault); |