[PATCH] pci: Warn if BME cannot be turned off during kexec

[Deepa Dinamani <deepa.kernel@gmail.com>]

BME not being off is a security risk, so for whatever
reason if we cannot disable it, print a warning.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
---
 drivers/pci/pci-driver.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 0454ca0e4e3f..6c866a81f46c 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -491,8 +491,12 @@ static void pci_device_shutdown(struct device *dev)
 	 * If it is not a kexec reboot, firmware will hit the PCI
 	 * devices with big hammer and stop their DMA any way.
 	 */
-	if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
-		pci_clear_master(pci_dev);
+	if (kexec_in_progress) {
+		if (likely(pci_dev->current_state <= PCI_D3hot))
+			pci_clear_master(pci_dev);
+		else
+			dev_warn(dev, "Unable to turn off BME during kexec");
+	}
 }
 
 #ifdef CONFIG_PM
-- 
2.17.1