With this fix, all code paths should now be obtaining the page lock before
f->sem.
Reported-by: NSzabó Tamás <sztomi89@gmail.com>
Tested-by: NThomas Betker <thomas.betker@rohde-schwarz.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
Cc: stable@vger.kernel.org