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IB/ipath: drop requirement that PIO buffers be mmaped write-only

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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>
This commit is contained in:
Bryan O'Sullivan 2006-08-25 11:24:30 -07:00 • committed by Roland Dreier
parent ba11203a11
commit 367fe711c5
1 changed files with 4 additions and 9 deletions
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13
drivers/infiniband/hw/ipath/ipath_file_ops.c
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@ -992,15 +992,10 @@ static int mmap_piobufs(struct vm_area_struct *vma,
pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED; pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
#endif #endif
if (vma->vm_flags & VM_READ) { /*
dev_info(&dd->pcidev->dev, * don't allow them to later change to readable with mprotect (for when
"Can't map piobufs as readable (flags=%lx)\n", * not initially mapped readable, as is normally the case)
vma->vm_flags); */
ret = -EPERM;
goto bail;
}
/* don't allow them to later change to readable with mprotect */
vma->vm_flags &= ~VM_MAYREAD; vma->vm_flags &= ~VM_MAYREAD;
vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;