linux-kernel - Re: [PATCH] sk98lin: handle pci_enable_device() return value in skge

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Message-ID: <20061012154714.6924f465@freekitty>
Date:	Thu, 12 Oct 2006 15:47:14 -0700
From:	Stephen Hemminger <shemminger@...l.org>
To:	Jiri Kosina <jikos@...os.cz>
Cc:	mlindner@...konnect.de, rroesler@...konnect.de,
	Andrew Morton <akpm@...l.org>, Jeff Garzik <jeff@...zik.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] sk98lin: handle pci_enable_device() return value in
 skge_resume() properly

On Fri, 13 Oct 2006 00:38:20 +0200 (CEST)
Jiri Kosina <jikos@...os.cz> wrote:

> On Thu, 12 Oct 2006, Stephen Hemminger wrote:
> 
> > >  	pci_set_power_state(pdev, PCI_D0);
> > >  	pci_restore_state(pdev);
> > > -	pci_enable_device(pdev);
> > > +	if ((ret = pci_enable_device(pdev))) {
> > > +		printk(KERN_ERR "sk98lin: Cannot enable PCI device during resume\n");
> > > +		unregister_netdev(dev);
> > >
> > Having the device unregister seems harsh.
> 
> What would be the proper way? As the initialization failed, accessing the 
> device would not make sense any more (therefore I don't think that calling 
> skge_remove_one() would be OK, as it issues calls to SkEventQueue() and 
> SkEventDispatcher(), trying to send something to the card).

I guess, its just not clear what the state of the machine is anyway
if you can't enable the device something is hosed (or the device was
hot removed).

> > Why put condtional on same line?
> 
> Pardon me?

I prefer:
	ret = pci_enable_device(pdev);
	if (ret) {



> 
> > Why not print device name dev->name.
> 
> Thanks.
> 
> [PATCH] fix sk98lin driver, ignoring return value from pci_enable_device()
> 
> add check of return value to _resume() function of sk98lin driver.
> 
> Signed-off-by: Jiri Kosina <jikos@...os.cz>
> 
> --- 
> 
>  drivers/net/sk98lin/skge.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/sk98lin/skge.c b/drivers/net/sk98lin/skge.c
> index d4913c3..1f03cf8 100644
> --- a/drivers/net/sk98lin/skge.c
> +++ b/drivers/net/sk98lin/skge.c
> @@ -5070,7 +5070,11 @@ static int skge_resume(struct pci_dev *p
>  
>  	pci_set_power_state(pdev, PCI_D0);
>  	pci_restore_state(pdev);
> -	pci_enable_device(pdev);
> +	if ((ret = pci_enable_device(pdev))) {
> +		printk(KERN_ERR "sk98lin: Cannot enable PCI device %s during resume\n", 
> +				dev->name);
> +		return ret;
> +	}
>  	pci_set_master(pdev);
>  	if (pAC->GIni.GIMacsFound == 2)
>  		ret = request_irq(dev->irq, SkGeIsr, IRQF_SHARED, "sk98lin", dev);
> 


-- 
Stephen Hemminger <shemminger@...l.org>
-
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