On 29/07/20 21:48, Maxim Levitsky wrote:
> Commit 5ff843721467 ("scsi: virtio_scsi: unplug LUNs when events missed"),
> almost fixed the case of mass unpluging of LUNs, but it missed a
> corner case in which all the LUNs are unplugged at the same time.
>
> In this case INQUIRY ends with DID_BAD_TARGET.
> Detect this and unplug the LUN.
>
> Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
> ---
> drivers/scsi/virtio_scsi.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
> index 0e0910c5b9424..c7f0c22b6f11d 100644
> --- a/drivers/scsi/virtio_scsi.c
> +++ b/drivers/scsi/virtio_scsi.c
> @@ -351,6 +351,16 @@ static void virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi)
> /* PQ indicates the LUN is not attached */
> scsi_remove_device(sdev);
> }
> +
> + else if (host_byte(result) == DID_BAD_TARGET) {
> + /*
> + * if all LUNs of a virtio-scsi device are unplugged,
> + * it will respond with BAD TARGET on any INQUIRY
> + * command.
> + * Remove the device in this case as well
> + */
> + scsi_remove_device(sdev);
> + }
> }
>
> kfree(inq_result);
>
Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
