netdev - Re: [PATCH net] net: fealnx: fix missing pci_disable

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Date:   Tue, 25 Oct 2022 13:27:05 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org
Subject: Re: [PATCH net] net: fealnx: fix missing pci_disable_device()

On Tue, Oct 25, 2022 at 05:01:58PM +0800, Yang Yingliang wrote:
> 
> On 2022/10/25 15:47, Leon Romanovsky wrote:
> > On Mon, Oct 24, 2022 at 09:57:28PM +0800, Yang Yingliang wrote:
> > > pci_disable_device() need be called while module exiting, switch
> > > to use pcim_enable(), pci_disable_device() and pci_release_regions()
> > > will be called in pcim_release() while unbinding device.
> > I didn't understand the description at all, maybe people in CC will.
> > Most likely, you wanted something like this:
> After using pcim_enable_device(), pcim_release() will be called while
> unbinding
> device, pcim_release() calls both pci_release_regions() and
> pci_disable_device().

I'm not sure that you can mix managed with unmanaged PCI APIs.

Thanks

> 
> Thanks,
> Yang
> > 
> > diff --git a/drivers/net/ethernet/fealnx.c b/drivers/net/ethernet/fealnx.c
> > index ed18450fd2cc..78107dd4aa57 100644
> > --- a/drivers/net/ethernet/fealnx.c
> > +++ b/drivers/net/ethernet/fealnx.c
> > @@ -690,6 +690,7 @@ static void fealnx_remove_one(struct pci_dev *pdev)
> >                  pci_iounmap(pdev, np->mem);
> >                  free_netdev(dev);
> >                  pci_release_regions(pdev);
> > +               pci_disable_device(pdev);
> >          } else
> >                  printk(KERN_ERR "fealnx: remove for unknown device\n");
> > 
> > 
> > > Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> > > Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> > > ---
> > >   drivers/net/ethernet/fealnx.c | 4 +---
> > >   1 file changed, 1 insertion(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/net/ethernet/fealnx.c b/drivers/net/ethernet/fealnx.c
> > > index ed18450fd2cc..fb139f295b67 100644
> > > --- a/drivers/net/ethernet/fealnx.c
> > > +++ b/drivers/net/ethernet/fealnx.c
> > > @@ -494,7 +494,7 @@ static int fealnx_init_one(struct pci_dev *pdev,
> > >   	option = card_idx < MAX_UNITS ? options[card_idx] : 0;
> > > -	i = pci_enable_device(pdev);
> > > +	i = pcim_enable_device(pdev);
> > >   	if (i) return i;
> > >   	pci_set_master(pdev);
> > > @@ -670,7 +670,6 @@ static int fealnx_init_one(struct pci_dev *pdev,
> > >   err_out_unmap:
> > >   	pci_iounmap(pdev, ioaddr);
> > >   err_out_res:
> > > -	pci_release_regions(pdev);
> > >   	return err;
> > >   }
> > > @@ -689,7 +688,6 @@ static void fealnx_remove_one(struct pci_dev *pdev)
> > >   		unregister_netdev(dev);
> > >   		pci_iounmap(pdev, np->mem);
> > >   		free_netdev(dev);
> > > -		pci_release_regions(pdev);
> > >   	} else
> > >   		printk(KERN_ERR "fealnx: remove for unknown device\n");
> > >   }
> > > -- 
> > > 2.25.1
> > > 
> > .