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:	Fri, 30 Sep 2011 08:31:49 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.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 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().

Jan

>  	snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
>  		psdev->pdev->xdev->otherend_id);
>  	nodename[strlen(nodename)] = '\0';




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