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Commit 367fe711 authored by Bryan O'Sullivan's avatar Bryan O'Sullivan Committed by Roland Dreier
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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: default avatarBryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent ba11203a

drivers/infiniband/hw/ipath/ipath_file_ops.c

+4 −9
Original line number Diff line number Diff line
@@ -992,15 +992,10 @@ static int mmap_piobufs(struct vm_area_struct *vma, 
	pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;

#endif



	if (vma->vm_flags & VM_READ) {

		dev_info(&dd->pcidev->dev,

			 "Can't map piobufs as readable (flags=%lx)\n",

			 vma->vm_flags);

		ret = -EPERM;

		goto bail;

	}



	/* don't allow them to later change to readable with mprotect */

	/*

	 * don't allow them to later change to readable with mprotect (for when

	 * not initially mapped readable, as is normally the case)

	 */

	vma->vm_flags &= ~VM_MAYREAD;

	vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;