[PATCH] Fix blk_stop_queue bug
Benh saw some bugs where the queue would end up being in an invalid state, and this could certainly explain one of them. We must not have a stopped queue on the plug list, and blk_plug_device() right now will happily plug a stopped queue. We don't need to have it plugged either, blk_start_queue() will make sure that request_fn gets run.
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