linux-kernel - Re: [Patch v10 01/12] net: mana: Add support for auxiliary device

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Message-ID: <Y2tGukmMbtOq1CWy@unreal>
Date:   Wed, 9 Nov 2022 08:20:42 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Long Li <longli@...rosoft.com>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "shiraz.saleem@...el.com" <shiraz.saleem@...el.com>,
        Ajay Sharma <sharmaajay@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [Patch v10 01/12] net: mana: Add support for auxiliary device

On Tue, Nov 08, 2022 at 09:33:21PM +0000, Long Li wrote:
> 
> > > int mana_probe(struct gdma_dev *gd, bool resuming)
> > >  				break;
> > >  		}
> > >  	}
> > > +
> > > +	err = add_adev(gd);
> > >  out:
> > >  	if (err)
> > >  		mana_remove(gd, false);
> > > @@ -2189,6 +2267,10 @@ void mana_remove(struct gdma_dev *gd, bool
> > suspending)
> > >  	int err;
> > >  	int i;
> > >
> > > +	/* adev currently doesn't support suspending, always remove it */
> > > +	if (gd->adev)
> > 
> > This condition is always true, isn't it?
> 
> I think the check is necessary. mana_probe() will call mana_remove() if it fails to
> add this adev to gd. If this is the case, we can't call remove_adev().

I'm sad to hear that. It is so anti-pattern to hide error unwind in one global function.
But ok, it is already there, so let's take this series as is.

Thanks

> 
> Thanks,
> Long