linux-kernel - Re: [PATCH blktests v2 1/2] nvme-rc: Cleanup fc ports in reverse order

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Date:   Wed, 3 May 2023 10:12:25 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     Shinichiro Kawasaki <shinichiro.kawasaki@....com>
Cc:     Sagi Grimberg <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Shin'ichiro Kawasaki <shinichiro@...tmail.com>
Subject: Re: [PATCH blktests v2 1/2] nvme-rc: Cleanup fc ports in reverse
 order

On Sun, Apr 30, 2023 at 10:07:06AM +0000, Shinichiro Kawasaki wrote:
> On Apr 19, 2023 / 12:41, Sagi Grimberg wrote:
> > 
> > 
> > On 4/19/23 11:47, Daniel Wagner wrote:
> > > We need to free the resources in the opposite order as we allocate them.
> > > 
> > > Signed-off-by: Daniel Wagner <dwagner@...e.de>
> > > ---
> > >   tests/nvme/rc | 4 ++--
> > >   1 file changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/tests/nvme/rc b/tests/nvme/rc
> > > index b44239446dcf..ec0cc2d8d8cc 100644
> > > --- a/tests/nvme/rc
> > > +++ b/tests/nvme/rc
> > > @@ -204,10 +204,10 @@ _cleanup_fcloop() {
> > >   	local remote_wwnn="${3:-$def_remote_wwnn}"
> > >   	local remote_wwpn="${4:-$def_remote_wwpn}"
> > > -	_nvme_fcloop_del_rport "${local_wwnn}" "${local_wwpn}" \
> > > -			       "${remote_wwnn}" "${remote_wwpn}"
> > >   	_nvme_fcloop_del_tport "${remote_wwnn}" "${remote_wwpn}"
> > >   	_nvme_fcloop_del_lport "${local_wwnn}" "${local_wwpn}"
> > > +	_nvme_fcloop_del_rport "${local_wwnn}" "${local_wwpn}" \
> > > +			       "${remote_wwnn}" "${remote_wwpn}"
> > >   }
> > >   _cleanup_nvmet() {
> > 
> > Does this fix a bug? if it does, than it should probably be documented
> > that there is a driver bug because userspace teardown ordering should
> > not trigger a driver bug.
> 
> I think this fixes a bug, and it can be a left work to add another new test
> case. Daniel, what do you think?

Initially I thought this fixes a bug when unloading the fc module. But this
change was just really fixing. So stringly speaking I don't think it really
workarounds a bug in the fc module unloading. I left the change in the series as
I though it makes sense to do the operation in reverse order.

So in short it's really just a cosmetic fix for blktests.