IB/ipath: drop requirement that PIO buffers be mmaped write-only
Some userlands try to mmap these pages read-write, so accommodate them. Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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@ -992,15 +992,10 @@ static int mmap_piobufs(struct vm_area_struct *vma,
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pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
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#endif
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if (vma->vm_flags & VM_READ) {
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dev_info(&dd->pcidev->dev,
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"Can't map piobufs as readable (flags=%lx)\n",
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vma->vm_flags);
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ret = -EPERM;
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goto bail;
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}
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/* don't allow them to later change to readable with mprotect */
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/*
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* don't allow them to later change to readable with mprotect (for when
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* not initially mapped readable, as is normally the case)
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*/
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vma->vm_flags &= ~VM_MAYREAD;
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vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
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