linux-kernel - Re: [Xen-devel] [PATCH 4/5] xen/pciback: Expand the warning message to include domain id.

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Message-Id: <4F06C101020000780006AC32@nat28.tlf.novell.com>
Date:	Fri, 06 Jan 2012 08:38:09 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	<xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <jbarnes@...tuousgeek.org>
Subject: Re: [Xen-devel] [PATCH 4/5] xen/pciback: Expand the warning
 message to include domain id.

>>> On 05.01.12 at 01:46, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> When a PCI device is transferred to another domain and it is still
> in usage (from the internal perspective), mention which other
> domain is using it to aid in debugging.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  drivers/xen/xen-pciback/xenbus.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
> index 474d52e..fa130bd 100644
> --- a/drivers/xen/xen-pciback/xenbus.c
> +++ b/drivers/xen/xen-pciback/xenbus.c
> @@ -243,8 +243,10 @@ static int xen_pcibk_export_device(struct 
> xen_pcibk_device *pdev,
>  	dev_dbg(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id);
>  	if (xen_register_device_domain_owner(dev,
>  					     pdev->xdev->otherend_id) != 0) {
> -		dev_err(&dev->dev, "device has been assigned to another " \
> -			"domain! Over-writting the ownership, but beware.\n");
> +		int other_domain = xen_find_device_domain_owner(dev);
> +		dev_err(&dev->dev, "device has been assigned to %d " \
> +			"domain! Over-writting the ownership, but beware.\n",
> +			other_domain);

As you're touching this anyway, how about fixing the other minor
issues with it too? E.g.

		dev_err(&dev->dev, "Device appears to be assigned to dom%d!"
			" Overwriting the ownership, but beware.\n",
			xen_find_device_domain_owner(dev));

(a native English speaker may want to comment the "but beware"
part - it reads odd for me).

Jan

>  		xen_unregister_device_domain_owner(dev);
>  		xen_register_device_domain_owner(dev, pdev->xdev->otherend_id);
>  	}
> -- 
> 1.7.7.4
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xensource.com 
> http://lists.xensource.com/xen-devel 



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