From 59057fbc37178f10a196ab7ec170b80273f75a47 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Wed, 11 Jul 2012 21:22:16 +0000 Subject: [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 Acked-by: Paolo Bonzini Signed-off-by: James Bottomley --- 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 ae3bef7c523f..c7030fbee79c 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -571,6 +571,13 @@ static struct virtio_scsi_target_state *virtscsi_alloc_tgt( return tgt; } +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) { struct Scsi_Host *sh = virtio_scsi_host(vdev); @@ -677,9 +684,10 @@ 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: @@ -735,6 +743,7 @@ 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 f3558070e375..c3b3f7f0d9d1 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 8efd28ae5597..a1ba8bbd9fbe 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 -- cgit v1.2.3