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[SCSI] virtio-scsi: Add vdrv->scan for post VIRTIO_CONFIG_S_DRIVER_OK LUN scanning
This patch changes virtio-scsi to use a new virtio_driver->scan() callback so that scsi_scan_host() can be properly invoked once virtio_dev_probe() has set add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK) to signal active virtio-ring operation, instead of from within virtscsi_probe(). This fixes a bug where SCSI LUN scanning for both virtio-scsi-raw and virtio-scsi/tcm_vhost setups was happening before VIRTIO_CONFIG_S_DRIVER_OK had been set, causing VIRTIO_SCSI_S_BAD_TARGET to occur. This fixes a bug with virtio-scsi/tcm_vhost where LUN scan was not detecting LUNs. Tested with virtio-scsi-raw + virtio-scsi/tcm_vhost w/ IBLOCK on 3.5-rc2 code. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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0b1017aab1
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@ -571,6 +571,13 @@ static struct virtio_scsi_target_state *virtscsi_alloc_tgt(
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return tgt;
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}
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static void virtscsi_scan(struct virtio_device *vdev)
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{
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struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv;
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scsi_scan_host(shost);
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}
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static void virtscsi_remove_vqs(struct virtio_device *vdev)
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{
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struct Scsi_Host *sh = virtio_scsi_host(vdev);
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@ -677,9 +684,10 @@ static int __devinit virtscsi_probe(struct virtio_device *vdev)
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err = scsi_add_host(shost, &vdev->dev);
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if (err)
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goto scsi_add_host_failed;
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scsi_scan_host(shost);
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/*
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* scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan()
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* after VIRTIO_CONFIG_S_DRIVER_OK has been set..
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*/
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return 0;
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scsi_add_host_failed:
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@ -735,6 +743,7 @@ static struct virtio_driver virtio_scsi_driver = {
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.driver.owner = THIS_MODULE,
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.id_table = id_table,
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.probe = virtscsi_probe,
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.scan = virtscsi_scan,
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#ifdef CONFIG_PM
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.freeze = virtscsi_freeze,
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.restore = virtscsi_restore,
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@ -141,8 +141,11 @@ static int virtio_dev_probe(struct device *_d)
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err = drv->probe(dev);
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if (err)
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add_status(dev, VIRTIO_CONFIG_S_FAILED);
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else
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else {
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add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
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if (drv->scan)
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drv->scan(dev);
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}
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return err;
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}
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@ -92,6 +92,7 @@ struct virtio_driver {
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const unsigned int *feature_table;
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unsigned int feature_table_size;
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int (*probe)(struct virtio_device *dev);
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void (*scan)(struct virtio_device *dev);
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void (*remove)(struct virtio_device *dev);
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void (*config_changed)(struct virtio_device *dev);
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#ifdef CONFIG_PM
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