[PATCH v3 2/3] xen/privcmd: Mark pages as dirty

[Souptick Joarder <jrdr.linux@xxxxxxxxx>]

pages need to be marked as dirty before unpinned it in
unlock_pages() which was oversight. This is fixed now.

Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Suggested-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Paul Durrant <xadimgnik@xxxxxxxxx>
---
 drivers/xen/privcmd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index b001673..079d35b 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -611,8 +611,11 @@ static void unlock_pages(struct page *pages[], unsigned 
int nr_pages)
 {
        unsigned int i;
 
-       for (i = 0; i < nr_pages; i++)
+       for (i = 0; i < nr_pages; i++) {
+               if (!PageDirty(pages[i]))
+                       set_page_dirty_lock(pages[i]);
                put_page(pages[i]);
+       }
 }
 
 static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
-- 
1.9.1