linux-kernel - Re: Print PCI device in power management warning.

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Date:	Fri, 23 Dec 2011 16:26:35 -0400
From:	Konrad Rzeszutek Wilk <konrad@...nok.org>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-pm@...r.kernel.org
Subject: Re: Print PCI device in power management warning.

On Fri, Dec 23, 2011 at 01:16:26PM -0500, Dave Jones wrote:
> When the WARN_ON in pci_has_legacy_pm_support() triggers, we get
> users filing backtraces, but it's not obvious which driver is
> triggering the trace. This adds a printk before the BUG.

Well, and adds a BUG!
> This still isn't perfect (automated tools like abrt will still miss it)
> but we can at least ask the user to look through their dmesg when
> we get these traces reported.
> 
> Signed-off-by: Dave Jones <davej@...hat.com>
> 
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index 12d1e81..b638244 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -604,7 +604,12 @@ static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
>  	 * supported as well.  Drivers are supposed to support either the
>  	 * former, or the latter, but not both at the same time.
>  	 */
> -	WARN_ON(ret && drv->driver.pm);
> +	if (ret && drv->driver.pm) {
> +		printk(KERN_WARNING "pci: %s has both legacy and new PM support.\n",
> +			drv->name);
> +		BUG();

Um, so this will hang the machine.

don't you just want:

	WARN(ret && drv->driver.pm, "pci: %s Has both legacy and new PM
support!\n", drv_name(drv));

which will do what it previously does and also add the message you
wanted to add?

> +	}
> +
>  
>  	return ret;
>  }
> --
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