Commit 1f704fd0 authored Dec 14, 2017 by Christophe JAILLET Committed by Linus Torvalds Dec 14, 2017

mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'

A semaphore is acquired before this check, so we must release it before
leaving.

Link: http://lkml.kernel.org/r/20171211211009.4971-1-christophe.jaillet@wanadoo.fr


Fixes: b7f0554a ("mm: fail get_vaddr_frames() for filesystem-dax mappings")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 0b265c3b

mm/frame_vector.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -62,8 +62,10 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
		* get_user_pages_longterm() and disallow it for filesystem-dax
		* mappings.
		*/
		if (vma_is_fsdax(vma))
		return -EOPNOTSUPP;
		if (vma_is_fsdax(vma)) {
		ret = -EOPNOTSUPP;
		goto out;
		}

		if (!(vma->vm_flags & (VM_IO \| VM_PFNMAP))) {
		vec->got_ref = true;