linux-kernel - Re: [PATCH v2 3/3] vsock/virtio: fix flush of works during the .remove()

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Message-ID: <20190701150834.GB11900@stefanha-x1.localdomain>
Date:   Mon, 1 Jul 2019 16:08:34 +0100
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     netdev@...r.kernel.org, kvm@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 3/3] vsock/virtio: fix flush of works during the
 .remove()

On Fri, Jun 28, 2019 at 02:36:59PM +0200, Stefano Garzarella wrote:
> This patch moves the flush of works after vdev->config->del_vqs(vdev),
> because we need to be sure that no workers run before to free the
> 'vsock' object.
> 
> Since we stopped the workers using the [tx|rx|event]_run flags,
> we are sure no one is accessing the device while we are calling
> vdev->config->reset(vdev), so we can safely move the workers' flush.

What about send_pkt and loopback work?  How were they stopped safely?

For example, if send_pkt work executes then we're in trouble since it
accesses the tx virtqueue which is deleted by ->del_vqs().

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