[BUG] scsi/qla2xxx: a possible sleep-in-atomic bug in qlt_get_tag

[Jia-Ju Bai]

The driver may sleep under a spinlock.
The function call paths are:
qlt_handle_abts_recv_work (acquire the spinlock)
  qlt_response_pkt_all_vps
    qlt_response_pkt
      qlt_handle_cmd_for_atio
        qlt_get_tag
          percpu_ida_alloc --> may sleep

qla82xx_msix_rsp_q (acquire the spinlock)
  qla24xx_process_response_queue
    qlt_handle_abts_recv
      qlt_response_pkt_all_vps
        qlt_response_pkt
          qlt_handle_cmd_for_atio
            qlt_get_tag
              percpu_ida_alloc --> may sleep-in-atomic

qla24xx_intr_handler (acquire the spinlock)
  qla24xx_process_response_queue
    qlt_handle_abts_recv
      qlt_response_pkt
        qlt_handle_cmd_for_atio
          qlt_get_tag
            percpu_ida_alloc --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and checked 
by my code review.


Thanks,
Jia-Ju Bai