jffs2: Fix page lock / f->sem deadlock

jffs2: Fix page lock / f->sem deadlock

Orabug: 23330971

[ Upstream commit 49e91e7079febe59a20ca885a87dd1c54240d0f1 ]

With this fix, all code paths should now be obtaining the page lock before
f->sem.

Reported-by: Szabó Tamás <sztomi89@gmail.com>
Tested-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit e0dae728bf0878ad831440ff5d2e90ec10b794a4)

Signed-off-by: Dan Duval <dan.duval@oracle.com>