xen/privcmd: Mark pages as dirty

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 <[email protected]> Suggested-by: John Hubbard <[email protected]> Reviewed-by: Juergen Gross <[email protected]> Reviewed-by: Paul Durrant <[email protected]> Cc: John Hubbard <[email protected]> Cc: Boris Ostrovsky <[email protected]> Cc: Paul Durrant <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Juergen Gross <[email protected]>
berg · Aug 3, 2020 · a0c34d2 · a0c34d2
1 parent e398fb4
commit a0c34d2
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
@@ -612,8 +612,11 @@ 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)