Re: 2.6.19-rc3-git7: scsi_device_unbusy: inconsistent lock state

[Mark Lord <liml@rtr.ca>]

And while we're at it:
> 
> (gdb) l *cfq_set_request+0x33e
> 0xc021780e is in cfq_set_request (block/cfq-iosched.c:1224).
> 1219            if (unlikely(!cfqd))
> 1220                    return;
> 1221
> 1222            spin_lock(cfqd->queue->queue_lock);
> 1223
> 1224            cfqq = cic->cfqq[ASYNC];
> 1225            if (cfqq) {
> 1226                    struct cfq_queue *new_cfqq;
> 1227                    new_cfqq = cfq_get_queue(cfqd, CFQ_KEY_ASYNC, cic->ioc->task,
> 1228                                             GFP_ATOMIC);

(gdb) l *scsi_device_unbusy+0x67
0xc029ee87 is in scsi_device_unbusy (drivers/scsi/scsi_lib.c:466).
461                          (shost->host_failed || shost->host_eh_scheduled)))
462                     scsi_eh_wakeup(shost);
463             spin_unlock(shost->host_lock);
464             spin_lock(sdev->request_queue->queue_lock);
465             sdev->device_busy--;
466             spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
467     }
468
469     /*
470      * Called for single_lun devices on IO completion. Clear starget_sdev_user,