io_uring: use bottom half safe lock for fixed file data
io_file_data_ref_zero() can be invoked from soft-irq from the RCU core, hence we need to ensure that the file_data lock is bottom half safe. Use the _bh() variants when grabbing this lock. Reported-by: <syzbot+1f4ba1e5520762c523c6@syzkaller.appspotmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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