Il 04/07/2012 06:24, Nicholas A. Bellinger ha scritto:
> From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
>
> 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.
>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Cc: Stefan Hajnoczi <stefanha@xxxxxxxxxxxxxxxxxx>
> Cc: Zhi Yong Wu <wuzhy@xxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: Hannes Reinecke <hare@xxxxxxx>
> Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Please send this independently. I think we also want it in stable@vger?
Paolo
> ---
> drivers/scsi/virtio_scsi.c | 15 ++++++++++++---
> drivers/virtio/virtio.c | 5 ++++-
> include/linux/virtio.h | 1 +
> 3 files changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
> index 1b38431..391b30d 100644
> --- a/drivers/scsi/virtio_scsi.c
> +++ b/drivers/scsi/virtio_scsi.c
> @@ -481,9 +481,10 @@ static int __devinit virtscsi_probe(struct virtio_device *vdev)
> err = scsi_add_host(shost, &vdev->dev);
> if (err)
> goto scsi_add_host_failed;
> -
> - scsi_scan_host(shost);
> -
> + /*
> + * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan()
> + * after VIRTIO_CONFIG_S_DRIVER_OK has been set..
> + */
> return 0;
>
> scsi_add_host_failed:
> @@ -493,6 +494,13 @@ virtscsi_init_failed:
> return err;
> }
>
> +static void virtscsi_scan(struct virtio_device *vdev)
> +{
> + struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv;
> +
> + scsi_scan_host(shost);
> +}
> +
> static void virtscsi_remove_vqs(struct virtio_device *vdev)
> {
> /* Stop all the virtqueues. */
> @@ -537,6 +545,7 @@ static struct virtio_driver virtio_scsi_driver = {
> .driver.owner = THIS_MODULE,
> .id_table = id_table,
> .probe = virtscsi_probe,
> + .scan = virtscsi_scan,
> #ifdef CONFIG_PM
> .freeze = virtscsi_freeze,
> .restore = virtscsi_restore,
> diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
> index f355807..c3b3f7f 100644
> --- a/drivers/virtio/virtio.c
> +++ b/drivers/virtio/virtio.c
> @@ -141,8 +141,11 @@ static int virtio_dev_probe(struct device *_d)
> err = drv->probe(dev);
> if (err)
> add_status(dev, VIRTIO_CONFIG_S_FAILED);
> - else
> + else {
> add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
> + if (drv->scan)
> + drv->scan(dev);
> + }
>
> return err;
> }
> diff --git a/include/linux/virtio.h b/include/linux/virtio.h
> index 8efd28a..a1ba8bb 100644
> --- a/include/linux/virtio.h
> +++ b/include/linux/virtio.h
> @@ -92,6 +92,7 @@ struct virtio_driver {
> const unsigned int *feature_table;
> unsigned int feature_table_size;
> int (*probe)(struct virtio_device *dev);
> + void (*scan)(struct virtio_device *dev);
> void (*remove)(struct virtio_device *dev);
> void (*config_changed)(struct virtio_device *dev);
> #ifdef CONFIG_PM
>
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