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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: b7f0554a56 ("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>
This commit is contained in:
Christophe JAILLET 2017-12-14 15:33:08 -08:00 committed by Linus Torvalds
parent 0b265c3b3b
commit 1f704fd0d1
1 changed files with 4 additions and 2 deletions
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6
mm/frame_vector.c
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@ -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 * get_user_pages_longterm() and disallow it for filesystem-dax
* mappings. * mappings.
*/ */
if (vma_is_fsdax(vma)) if (vma_is_fsdax(vma)) {
return -EOPNOTSUPP; ret = -EOPNOTSUPP;
goto out;
}
if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
vec->got_ref = true; vec->got_ref = true;