Source of sr.c - linux-imx - PHYTEC BitBucket (Stash)

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static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
{
    int block = 0, this_count, s_size;
    struct scsi_cd *cd;
    struct request *rq = SCpnt->request;
    blk_status_t ret;
​
    ret = scsi_init_io(SCpnt);
    if (ret != BLK_STS_OK)
        goto out;
    WARN_ON_ONCE(SCpnt != rq->special);
    cd = scsi_cd(rq->rq_disk);
​
    /* from here on until we're complete, any goto out
     * is used for a killable error condition */
    ret = BLK_STS_IOERR;
​
    SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
        "Doing sr request, block = %d\n", block));
​
    if (!cd->device || !scsi_device_online(cd->device)) {