From: Alek Du Date: Sat, 8 Aug 2009 00:46:19 +0000 (+0800) Subject: PCI: check saved state before restore X-Git-Tag: v2.6.31-rc8~50^2 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=c82f63e411f1b58427c103bd95af2863b1c96dd1;p=linux-block.git PCI: check saved state before restore Without the check, the config space may be filled with zeros. Though the driver should try to avoid call restoring before saving, but the pci layer also should check this. Also removes the existing check in pci_restore_standard_config, since it's superfluous with the new check in restore_state. Acked-by: Rafael J. Wysocki Signed-off-by: Alek Du Signed-off-by: Jesse Barnes --- diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index d76c4c85367e..f99bc7f089f1 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -508,7 +508,7 @@ static int pci_restore_standard_config(struct pci_dev *pci_dev) return error; } - return pci_dev->state_saved ? pci_restore_state(pci_dev) : 0; + return pci_restore_state(pci_dev); } static void pci_pm_default_resume_noirq(struct pci_dev *pci_dev) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index dbd0f947f497..7b70312181d7 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -846,6 +846,8 @@ pci_restore_state(struct pci_dev *dev) int i; u32 val; + if (!dev->state_saved) + return 0; /* PCI Express register must be restored first */ pci_restore_pcie_state(dev);