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

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Date:	Fri, 23 Dec 2011 15:46:09 -0500
From:	Dave Jones <davej@...hat.com>
To:	Konrad Rzeszutek Wilk <konrad@...nok.org>
Cc:	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 04:26:35PM -0400, Konrad Rzeszutek Wilk wrote:
 
 > 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?

close. Not sure what drv_name() is, but I don't seem to have it in my tree.
This works though..

--- 

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.  Printing the driver name in addition to the trace
should make these easier to debug.

Signed-off-by: Dave Jones <davej@...hat.com>

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 12d1e81..8af9ff2 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -604,7 +604,7 @@ 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);
+	WARN(ret && drv->driver.pm, "pci: %s Has both legacy and new PM support!\n", drv->name);
 
 	return ret;
 }
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