linux-kernel - Re: [PATCH v7 42/46] virtio

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Date:	Mon, 1 Dec 2014 14:53:05 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
	thuth@...ux.vnet.ibm.com, dahi@...ux.vnet.ibm.com,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-scsi@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v7 42/46] virtio_scsi: v1.0 support

On Mon, Dec 01, 2014 at 01:50:01PM +0100, Cornelia Huck wrote:
> On Sun, 30 Nov 2014 17:12:47 +0200
> "Michael S. Tsirkin" <mst@...hat.com> wrote:
> 
> > Note: for consistency, and to avoid sparse errors,
> >   convert all fields, even those no longer in use
> >   for virtio v1.0.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > Acked-by: Paolo Bonzini <pbonzini@...hat.com>
> > ---
> >  include/linux/virtio_scsi.h | 32 +++++++++++++++-------------
> >  drivers/scsi/virtio_scsi.c  | 51 ++++++++++++++++++++++++++++-----------------
> >  2 files changed, 49 insertions(+), 34 deletions(-)
> > 
> 
> > @@ -196,10 +196,13 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
> >  		break;
> >  	}
> > 
> > -	WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE);
> > +	WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) >
> > +		VIRTIO_SCSI_SENSE_SIZE);
> 
> Introduce a local variable for this? Might make this statement and the
> min_t statement below easier to read.

I prefer 1:1 code conversions. We can do refactorings on top.
Since you mention this line as hard to read, I'll just make it > 80
chars for now, and trivial line splits can come later.
OK?

> >  	if (sc->sense_buffer) {
> >  		memcpy(sc->sense_buffer, resp->sense,
> > -		       min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE));
> > +		       min_t(u32,
> > +			     virtio32_to_cpu(vscsi->vdev, resp->sense_len),
> > +			     VIRTIO_SCSI_SENSE_SIZE));
> >  		if (resp->sense_len)
> >  			set_driver_byte(sc, DRIVER_SENSE);
> >  	}
> 
> Otherwise looks good to me.
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