linux-kernel - Re: [PATCH 4/6] virtio-blk: implement ->make

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Date:	Thu, 22 Dec 2011 12:20:01 +0000
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Chris Wright <chrisw@...s-sol.org>,
	Jens Axboe <axboe@...nel.dk>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Minchan Kim <minchan@...hat.com>
Subject: Re: [PATCH 4/6] virtio-blk: implement ->make_request

On Wed, Dec 21, 2011 at 1:00 AM, Minchan Kim <minchan@...nel.org> wrote:
> +static void virtblk_add_buf_wait(struct virtio_blk *vblk,
> +       struct virtblk_req *vbr, unsigned long out, unsigned long in)
> +{
> +       DEFINE_WAIT(wait);
> +       bool retry, notify;
> +
> +       for (;;) {
> +               prepare_to_wait(&vblk->queue_wait, &wait,
> +                               TASK_UNINTERRUPTIBLE);
> +
> +               spin_lock_irq(&vblk->lock);
> +               if (virtqueue_add_buf(vblk->vq, vbr->sg,
> +                       out, in, vbr) < 0) {
> +                       retry = true;
> +               } else {
> +                       retry = false;
> +               }
> +               notify = virtqueue_kick_prepare(vblk->vq);
> +               spin_unlock_irq(&vblk->lock);
> +
> +               if (notify)

virtblk_make_request() checks that the queue is not plugged.  Do we
need to do that here too?
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