linux-kernel - Re: [Xen-devel] [PATCH 1/9] xen/pciback: Do not dereference psdev during printk when it is NULL.

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Date:	Mon, 3 Oct 2011 12:14:50 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	Dan Carpenter <error27@...il.com>, xen-devel@...ts.xensource.com,
	linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH 1/9] xen/pciback: Do not dereference psdev
 during printk when it is NULL.

On Fri, Sep 30, 2011 at 08:31:49AM +0100, Jan Beulich wrote:
> >>> On 29.09.11 at 21:52, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> > . instead use printk(.. facility.
> > 
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > ---
> >  drivers/xen/xen-pciback/pci_stub.c |    8 +++++---
> >  1 files changed, 5 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/xen/xen-pciback/pci_stub.c 
> > b/drivers/xen/xen-pciback/pci_stub.c
> > index aec214a..32d6891 100644
> > --- a/drivers/xen/xen-pciback/pci_stub.c
> > +++ b/drivers/xen/xen-pciback/pci_stub.c
> > @@ -514,9 +514,11 @@ static void kill_domain_by_device(struct pcistub_device 
> > *psdev)
> >  	int err;
> >  	char nodename[PCI_NODENAME_MAX];
> >  
> > -	if (!psdev)
> > -		dev_err(&psdev->dev->dev,
> > -			"device is NULL when do AER recovery/kill_domain\n");
> > +	if (!psdev) {
> > +		printk(KERN_ERR DRV_NAME
> > +			":device is NULL when do AER recovery/kill_domain\n");
> > +		return;
> > +	}
> 
> This is bogus - all callers of this function already make sure psdev is
> non-NULL, so imo the check should be removed or replaced with a
> BUG_ON().

Done!
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