netdev - Re: [PATCH] vhost/scsi: Use safe iteration in vhost_scsi_complete_cmd

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Message-ID: <20171116033036-mutt-send-email-mst@kernel.org>
Date:   Thu, 16 Nov 2017 03:30:52 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Byungchul Park <byungchul.park@....com>
Cc:     nab@...ux-iscsi.org, jasowang@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@....com
Subject: Re: [PATCH] vhost/scsi: Use safe iteration in
 vhost_scsi_complete_cmd_work()

On Thu, Nov 16, 2017 at 08:52:39AM +0900, Byungchul Park wrote:
> On Thu, Nov 09, 2017 at 09:17:29AM +0900, Byungchul Park wrote:
> > I am sorry for having made a mistake on it.
> 
> Hello Nicholas,
> 
> Please consider this patch urgently. I'm sorry for having changed the
> original behavior with the previous patch.
> 
> The safe version of llist API should be used to keep the original
> behavior.
> 
> Thanks,
> Byungchul

I have included this patch in my tree.

> > -----8<-----
> > >From ba9a0f76dffceffa4fa3aa2d9be49cdb0d9b7d4f Mon Sep 17 00:00:00 2001
> > From: Byungchul Park <byungchul.park@....com>
> > Date: Thu, 9 Nov 2017 09:00:21 +0900
> > Subject: [PATCH] vhost/scsi: Use safe iteration in vhost_scsi_complete_cmd_work()
> > 
> > The following patch changed the behavior which originally did safe
> > iteration. Make it safe as it was.
> > 
> >    12bdcbd539c6327c09da0503c674733cb2d82cb5
> >    vhost/scsi: Don't reinvent the wheel but use existing llist API
> > 
> > Signed-off-by: Byungchul Park <byungchul.park@....com>
> > ---
> >  drivers/vhost/scsi.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
> > index 046f6d2..46539ca 100644
> > --- a/drivers/vhost/scsi.c
> > +++ b/drivers/vhost/scsi.c
> > @@ -519,7 +519,7 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
> >  					vs_completion_work);
> >  	DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
> >  	struct virtio_scsi_cmd_resp v_rsp;
> > -	struct vhost_scsi_cmd *cmd;
> > +	struct vhost_scsi_cmd *cmd, *t;
> >  	struct llist_node *llnode;
> >  	struct se_cmd *se_cmd;
> >  	struct iov_iter iov_iter;
> > @@ -527,7 +527,7 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
> >  
> >  	bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
> >  	llnode = llist_del_all(&vs->vs_completion_list);
> > -	llist_for_each_entry(cmd, llnode, tvc_completion_list) {
> > +	llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) {
> >  		se_cmd = &cmd->tvc_se_cmd;
> >  
> >  		pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
> > -- 
> > 1.9.1