From: Rafael J. Wysocki <rjw@sisk.pl>
Date: Wed, 4 Feb 2009 00:57:22 +0000 (+0100)
Subject: PCI PM: Check if the state has been saved before trying to restore it
X-Git-Tag: 2.1b_release~14104^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=144a76bc885ef4852601c66595326e59f12877f8;p=platform%2Fkernel%2Fkernel-mfld-blackbay.git

PCI PM: Check if the state has been saved before trying to restore it

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@sisk.pl>
Reported-By: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 4880755..87c9042 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1421,7 +1421,7 @@ int pci_restore_standard_config(struct pci_dev *dev)
 	dev->current_state = PCI_D0;
 
  Restore:
-	return pci_restore_state(dev);
+	return dev->state_saved ? pci_restore_state(dev) : 0;
 }
 
 /**