Merge remote-tracking branch 'lsk/v3.10/topic/arm64-hmp' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / drivers / pci / pci-driver.c

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 79277fb36c6bf7a85b4634df28ff13d1905d703d..66aabde827277dd533b47b7ba9bfd5ddf5ff1888 100644 (file)
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -19,6 +19,7 @@
 #include <linux/cpu.h>
 #include <linux/pm_runtime.h>
 #include <linux/suspend.h>
+#include <linux/kexec.h>
 #include "pci.h"
 
 struct pci_dynid {
@@ -388,12 +389,17 @@ static void pci_device_shutdown(struct device *dev)
        pci_msi_shutdown(pci_dev);
        pci_msix_shutdown(pci_dev);
 
+#ifdef CONFIG_KEXEC
        /*
-        * Turn off Bus Master bit on the device to tell it to not
-        * continue to do DMA. Don't touch devices in D3cold or unknown states.
+        * If this is a kexec reboot, turn off Bus Master bit on the
+        * device to tell it to not continue to do DMA. Don't touch
+        * devices in D3cold or unknown states.
+        * If it is not a kexec reboot, firmware will hit the PCI
+        * devices with big hammer and stop their DMA any way.
         */
-       if (pci_dev->current_state <= PCI_D3hot)
+       if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
                pci_clear_master(pci_dev);
+#endif
 }
 
 #ifdef CONFIG_PM