linux-kernel - Re: [PATCH 5/6] vringh: fix copy direction of vringh_iov_push

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Message-ID: <20190923094559.765da494@x1.home>
Date:   Mon, 23 Sep 2019 09:45:59 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org,
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        mst@...hat.com, tiwei.bie@...el.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        cohuck@...hat.com, maxime.coquelin@...hat.com,
        cunming.liang@...el.com, zhihong.wang@...el.com,
        rob.miller@...adcom.com, xiao.w.wang@...el.com,
        haotian.wang@...ive.com, zhenyuw@...ux.intel.com,
        zhi.a.wang@...el.com, jani.nikula@...ux.intel.com,
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        eperezma@...hat.com, lulu@...hat.com, parav@...lanox.com
Subject: Re: [PATCH 5/6] vringh: fix copy direction of
 vringh_iov_push_kern()

On Mon, 23 Sep 2019 21:03:30 +0800
Jason Wang <jasowang@...hat.com> wrote:

> We want to copy from iov to buf, so the direction was wrong.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  drivers/vhost/vringh.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)


Why is this included in the series?  Seems like an unrelated fix being
held up within a proposal for a new feature.  Thanks,

Alex
 
> diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
> index 08ad0d1f0476..a0a2d74967ef 100644
> --- a/drivers/vhost/vringh.c
> +++ b/drivers/vhost/vringh.c
> @@ -852,6 +852,12 @@ static inline int xfer_kern(void *src, void *dst, size_t len)
>  	return 0;
>  }
>  
> +static inline int kern_xfer(void *dst, void *src, size_t len)
> +{
> +	memcpy(dst, src, len);
> +	return 0;
> +}
> +
>  /**
>   * vringh_init_kern - initialize a vringh for a kernelspace vring.
>   * @vrh: the vringh to initialize.
> @@ -958,7 +964,7 @@ EXPORT_SYMBOL(vringh_iov_pull_kern);
>  ssize_t vringh_iov_push_kern(struct vringh_kiov *wiov,
>  			     const void *src, size_t len)
>  {
> -	return vringh_iov_xfer(wiov, (void *)src, len, xfer_kern);
> +	return vringh_iov_xfer(wiov, (void *)src, len, kern_xfer);
>  }
>  EXPORT_SYMBOL(vringh_iov_push_kern);
>