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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <Y1fM/vPXWz2mKhnq@unreal>
Date:   Tue, 25 Oct 2022 14:48:14 +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 07:25:48PM +0800, Yang Yingliang wrote:
> 
> On 2022/10/25 18:27, Leon Romanovsky wrote:
> > 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
> After pcim_enable_device() being called, the region_mask is set in
> __pci_request_region(). pcim_release() will call pci_release_region()
> because region_mask is set.
> 
> Without device managed, the pci_release_region() and pci_disable_device()
> is called at end of remove() function which is called in device_remove(),
> and
> with managed, they are called in device_unbind_cleanup() which is called
> after device_remove(). So I think it's OK to use this management.

Even so, why do you think that call in device_unbind_cleanup() is the
right one for such an old driver?

Thanks

> 
> Thanks,
> Yang
> > 
> > > 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
> > > > > 
> > > > .
> > .