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As of 2.6.31, if the rq_timed_out_fn field in the request_queue is set to NULL, then blk_add_timer() will not start the timer request when called from
blk_start_request() in blk-core.c
So not setting rq_timed_out_fn (i.e. not calling blk_queue_rq_timed_out()) seems the way to disable any timing for the requests in that queue.
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