From 6e0eda3c389887168455b92b6f7b48f552227067 Mon Sep 17 00:00:00 2001 From: Konstantin Khlebnikov Date: Thu, 14 Mar 2013 18:49:37 +0400 Subject: [PATCH] PCI: Don't try to disable Bus Master on disconnected PCI devices This is a fix for commit 7897e60227 ("PCI: Disable Bus Master unconditionally in pci_device_shutdown()"). Vivek reported that with this commit, kexec failed because none of his SATA disks came up. A ->shutdown() callback might put the device in D3cold, which means config space is no longer available. [bhelgaas: changelog] Link: https://lkml.org/lkml/2013/3/12/529 Reported-and-Tested-by: Vivek Goyal Signed-off-by: Konstantin Khlebnikov Signed-off-by: Bjorn Helgaas Cc: Rafael J. Wysocki --- drivers/pci/pci-driver.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 1fa1e482a999..79277fb36c6b 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -390,9 +390,10 @@ static void pci_device_shutdown(struct device *dev) /* * Turn off Bus Master bit on the device to tell it to not - * continue to do DMA + * continue to do DMA. Don't touch devices in D3cold or unknown states. */ - pci_clear_master(pci_dev); + if (pci_dev->current_state <= PCI_D3hot) + pci_clear_master(pci_dev); } #ifdef CONFIG_PM -- 2.20.1