PM: hibernate: flush swap writer after marking

BugLink: https://bugs.launchpad.net/bugs/1916056

commit fef9c8d upstream.

Flush the swap writer after, not before, marking the files, to ensure the
signature is properly written.

Fixes: 6f612af ("PM / Hibernate: Group swap ops")
Signed-off-by: Laurent Badel <[email protected]>
Cc: All applicable <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Stefan Bader <[email protected]>

Author: laurentbadel-eaton

kernel/power/swap.c

@@ -489,10 +489,10 @@ static int swap_writer_finish(struct swap_map_handle *handle,
 		unsigned int flags, int error)
 {
 	if (!error) {
-		flush_swap_writer(handle);
 		pr_info("S");
 		error = mark_swapfiles(handle, flags);
 		pr_cont("|\n");
+		flush_swap_writer(handle);
 	}
 
 	if (error)