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    Subject[PATCH] scsi_execute_async() should add to the tail of the queue

    scsi_execute_async() has replaced scsi_do_req() a few versions ago,
    but it also incurred a change of behavior. I noticed that over-queuing
    a SCSI device using that function causes I/Os to be starved from
    low-level queuing for no justified reason.

    I think it makes much more sense to perserve the original behaviour
    of scsi_do_req() and add the request to the tail of the queue.

    Signed-off-by: Dan Aloni <>

    diff -p -urN a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
    --- a/drivers/scsi/scsi_lib.c 2006-12-19 01:48:50.000000000 +0200
    +++ b/drivers/scsi/scsi_lib.c 2006-12-19 01:49:35.000000000 +0200
    @@ -421,7 +421,7 @@ int scsi_execute_async(struct scsi_devic
    sioc->data = privdata;
    sioc->done = done;

    - blk_execute_rq_nowait(req->q, NULL, req, 1, scsi_end_async);
    + blk_execute_rq_nowait(req->q, NULL, req, 0, scsi_end_async);
    return 0;


    Dan Aloni
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