Revert "loop: Get rid of loop_index_mutex"
This reverts commit 611f7719 which is commit 0a42e99b58a208839626465af194cfe640ef9493 upstream. It is not needed in the 4.4.y tree at this time. Reported-by: Jan Kara <firstname.lastname@example.org> Cc: Jens Axboe <email@example.com> Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
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