Fwd: [PATCH 4/4] vhost-user-blk: fix crash in realize process

[Li Feng <fengli@smartx.com>]

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Thank you, Raphael .

Raphael Norwitz <raphael.norwitz@nutanix.com> 于2020年4月17日周五 下午12:10写道：
>
> Mostly looks good - just a few superficial notes.
>
> On Wed, Apr 15, 2020 at 11:28:26AM +0800, Li Feng wrote:
> > 1. set s->connected to true after vhost_dev_init;
> > 2. call vhost_dev_get_config when s->connected is true, otherwise the
> >     hdev->host_ops will be nullptr.
>
> You mean hdev->vhost_ops, right?
>
Yes.
> >
> > Signed-off-by: Li Feng <fengli@smartx.com>
> > ---
> >  hw/block/vhost-user-blk.c | 47 +++++++++++++++++++++++++----------------------
> >  1 file changed, 25 insertions(+), 22 deletions(-)
> > +    /*
> > +     * set true util vhost_dev_init return ok, because CLOSE event may happen
> > +     * in vhost_dev_init routine.
> > +     */
>
> I'm a little confused by this comment. Do you mean to say “wait until vhost_dev_init
> succeeds to set connected to true, because a close event may happen while
> vhost_dev_init is executing”?
Yes. This is the exception path:
qemu_chr_fe_set_handlers
   -> vhost_user_blk_event(OPEN)
       -> vhost_user_blk_connect
            -> vhost_dev_init
                -> vhost_user_blk_event(CLOSE)
                -> vhost_dev_cleanup
We should set connected to true only when vhost_dev_init returns OK.
If a close event is triggered, we shouldn't set connected to true.

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