• Bart Van Assche's avatar
    block: Avoid that request_fn is invoked on a dead queue · c246e80d
    Bart Van Assche authored
    A block driver may start cleaning up resources needed by its
    request_fn as soon as blk_cleanup_queue() finished, so request_fn
    must not be invoked after draining finished. This is important
    when blk_run_queue() is invoked without any requests in progress.
    As an example, if blk_drain_queue() and scsi_run_queue() run in
    parallel, blk_drain_queue() may have finished all requests after
    scsi_run_queue() has taken a SCSI device off the starved list but
    before that last function has had a chance to run the queue.
    Signed-off-by: default avatarBart Van Assche <bvanassche@acm.org>
    Cc: James Bottomley <JBottomley@Parallels.com>
    Cc: Mike Christie <michaelc@cs.wisc.edu>
    Cc: Chanho Min <chanho.min@lge.com>
    Acked-by: default avatarTejun Heo <tj@kernel.org>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    c246e80d
blk.h 7.13 KB