• Tony Battersby's avatar
    scsi-mq: fix requests that use a separate CDB buffer · 6f4a1626
    Tony Battersby authored
    This patch fixes code such as the following with scsi-mq enabled:
    
        rq = blk_get_request(...);
        blk_rq_set_block_pc(rq);
    
        rq->cmd = my_cmd_buffer; /* separate CDB buffer */
    
        blk_execute_rq_nowait(...);
    
    Code like this appears in e.g. sg_start_req() in drivers/scsi/sg.c (for
    large CDBs only).  Without this patch, scsi_mq_prep_fn() will set
    rq->cmd back to rq->__cmd, causing the wrong CDB to be sent to the device.
    Signed-off-by: default avatarTony Battersby <tonyb@cybernetics.com>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    6f4a1626
scsi_lib.c 76.2 KB