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powerpc/spufs: Use correct return value for spu_handle_mm_fault

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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>
This commit is contained in:
Jeremy Kerr 2009-02-17 11:44:14 +11:00 committed by Benjamin Herrenschmidt
parent 13870b6575
commit 60ee031940
1 changed files with 22 additions and 26 deletions
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48
arch/powerpc/platforms/cell/spu_fault.c
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@ -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) {
if (mm->pgd == NULL)
return -EFAULT;
}
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++;
out_unlock:
up_read(&mm->mmap_sem);
return ret;
bad_area:
up_read(&mm->mmap_sem);
return -EFAULT;
}
EXPORT_SYMBOL_GPL(spu_handle_mm_fault);