Re: [PATCH v2 2/2] virtio_ring: packed ring: fix virtqueue_detach_unused_buf

[Greg KH]

On Thu, Aug 08, 2019 at 08:28:46AM -0400, Pankaj Gupta wrote:
> 
> 
> > > This patch makes packed ring code compatible with split ring in function
> > > 'virtqueue_detach_unused_buf_*'.
> > 
> > What does that mean?  What does this "fix"?
> 
> Patch 1 frees the buffers When a port is unplugged from the virtio
> console device. It does this with the help of 'virtqueue_detach_unused_buf_split/packed'
> function. For split ring case, corresponding function decrements avail ring index.
> For packed ring code, this functionality is not available, so this patch adds the
> required support and hence help to remove the unused buffer completely.

Explain all of this in great detail in the changelog comment.  What you
have in there today does not make any sense.

thanks,

greg k-h