linux-kernel - Re: [PATCH AUTOSEL 5.9 22/33] vhost scsi: add lun parser helper

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Date:   Wed, 25 Nov 2020 18:48:21 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Mike Christie <michael.christie@...cle.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.9 22/33] vhost scsi: add lun parser helper

On 25/11/20 16:35, Sasha Levin wrote:
> From: Mike Christie <michael.christie@...cle.com>
> 
> [ Upstream commit 18f1becb6948cd411fd01968a0a54af63732e73c ]
> 
> Move code to parse lun from req's lun_buf to helper, so tmf code
> can use it in the next patch.
> 
> Signed-off-by: Mike Christie <michael.christie@...cle.com>
> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
> Acked-by: Jason Wang <jasowang@...hat.com>
> Link: https://lore.kernel.org/r/1604986403-4931-5-git-send-email-michael.christie@oracle.com
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> Acked-by: Stefan Hajnoczi <stefanha@...hat.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

This doesn't seem like stable material, does it?

Paolo

> ---
>   drivers/vhost/scsi.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
> index 5d8850f5aef16..ed7dc6b998f65 100644
> --- a/drivers/vhost/scsi.c
> +++ b/drivers/vhost/scsi.c
> @@ -898,6 +898,11 @@ vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc,
>   	return ret;
>   }
>   
> +static u16 vhost_buf_to_lun(u8 *lun_buf)
> +{
> +	return ((lun_buf[2] << 8) | lun_buf[3]) & 0x3FFF;
> +}
> +
>   static void
>   vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
>   {
> @@ -1036,12 +1041,12 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
>   			tag = vhost64_to_cpu(vq, v_req_pi.tag);
>   			task_attr = v_req_pi.task_attr;
>   			cdb = &v_req_pi.cdb[0];
> -			lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
> +			lun = vhost_buf_to_lun(v_req_pi.lun);
>   		} else {
>   			tag = vhost64_to_cpu(vq, v_req.tag);
>   			task_attr = v_req.task_attr;
>   			cdb = &v_req.cdb[0];
> -			lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
> +			lun = vhost_buf_to_lun(v_req.lun);
>   		}
>   		/*
>   		 * Check that the received CDB size does not exceeded our
>