linux-kernel - [PATCH 2/7] PCI PM: Check if the state has been saved before trying to restore it

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Message-Id: <200902040157.23385.rjw@sisk.pl>
Date:	Wed, 4 Feb 2009 01:57:22 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>
Subject: [PATCH 2/7] PCI PM: Check if the state has been saved before trying to restore it

From: Rafael J. Wysocki <rjw@...k.pl>

Check if the standard configuration registers of a PCI device have
been saved during suspend before trying to restore them during
resume.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Reported-By: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---
 drivers/pci/pci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -1421,7 +1421,7 @@ int pci_restore_standard_config(struct p
 	dev->current_state = PCI_D0;
 
  Restore:
-	return pci_restore_state(dev);
+	return dev->state_saved ? pci_restore_state(dev) : 0;
 }
 
 /**

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