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From: Greg KH <greg@kroah.com>
To: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	dledford@redhat.com, linux-rdma@vger.kernel.org,
	Kaike Wan <kaike.wan@intel.com>,
	stable@vger.kernel.org
Subject: Re: [PATCH for-rc 1/4] IB/hfi1: Call xa_destroy before freeing dummy_netdev
Date: Thu, 1 Apr 2021 08:06:38 +0200
Message-ID: <YGVi7uT9kyfk7Mo7@kroah.com> (raw)
In-Reply-To: <7da1174e-97a6-3933-ae35-166a9dcbf38e@cornelisnetworks.com>

On Wed, Mar 31, 2021 at 03:36:14PM -0400, Dennis Dalessandro wrote:
> On 3/29/2021 10:09 AM, Jason Gunthorpe wrote:
> > On Mon, Mar 29, 2021 at 09:48:17AM -0400, dennis.dalessandro@cornelisnetworks.com wrote:
> > 
> > > diff --git a/drivers/infiniband/hw/hfi1/netdev_rx.c b/drivers/infiniband/hw/hfi1/netdev_rx.c
> > > index 2c8bc02..cec02e8 100644
> > > +++ b/drivers/infiniband/hw/hfi1/netdev_rx.c
> > > @@ -372,7 +372,11 @@ int hfi1_netdev_alloc(struct hfi1_devdata *dd)
> > >   void hfi1_netdev_free(struct hfi1_devdata *dd)
> > >   {
> > >   	if (dd->dummy_netdev) {
> > > +		struct hfi1_netdev_priv *priv =
> > > +			hfi1_netdev_priv(dd->dummy_netdev);
> > > +
> > >   		dd_dev_info(dd, "hfi1 netdev freed\n");
> > > +		xa_destroy(&priv->dev_tbl);
> > >   		kfree(dd->dummy_netdev);
> > >   		dd->dummy_netdev = NULL;
> > 
> > This is doing kfree() on a struct net_device?? Huh?
> > 
> > You should have put this in your own struct and used container_of not
> > co-oped netdev_priv, then free your own struct.
> > 
> > It is a bit weird to see a xa_destroy like this, how did things get ot
> > the point that no concurrent thread can see the xarray but there is
> > still stuff stored in it?
> > 
> > And it is weird this is storing two different types in it too, with no
> > refcounting..
> 
> We do rework this stuff in the other patch series.
> 
> https://patchwork.kernel.org/project/linux-rdma/patch/1617026056-50483-11-git-send-email-dennis.dalessandro@cornelisnetworks.com/
> 
> If we fix it up in the for-next series, what should we do about stable?

What does stable matter?  WHy can it not just take the same patches that
end up in Linus's tree?

thanks,

greg k-h

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-29 13:48 [PATCH for-rc 0/4] hfi fixes dennis.dalessandro
2021-03-29 13:48 ` [PATCH for-rc 1/4] IB/hfi1: Call xa_destroy before freeing dummy_netdev dennis.dalessandro
2021-03-29 14:09   ` Jason Gunthorpe
2021-03-31 19:36     ` Dennis Dalessandro
2021-04-01  6:06       ` Greg KH [this message]
2021-04-01 14:02         ` Dennis Dalessandro
2021-04-01 14:12           ` Greg KH
2021-04-01 15:00             ` Dennis Dalessandro
2021-04-01 12:33       ` Jason Gunthorpe
2021-04-01 13:42         ` Wan, Kaike
2021-04-01 13:48           ` Jason Gunthorpe
2021-03-29 13:48 ` [PATCH for-rc 2/4] IB/hfi1: Call xa_destroy before unloading the module dennis.dalessandro
2021-03-29 14:11   ` Jason Gunthorpe
2021-04-08 13:30     ` Dennis Dalessandro
2021-03-29 13:48 ` [PATCH for-rc 3/4] IB/hfi1: Fix probe time panic when AIP is enabled with a buggy BIOS dennis.dalessandro
2021-04-07 23:04   ` Jason Gunthorpe
2021-03-29 13:48 ` [PATCH for-rc 4/4] IB/hfi1: Fix regressions in security fix dennis.dalessandro
2021-03-29 18:36   ` Ira Weiny
2021-04-07 18:33     ` Jason Gunthorpe
2021-04-07 20:20       ` Dennis Dalessandro
2021-04-13 22:55   ` Jason Gunthorpe

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