1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index f5eb9e7b5b18..b3eb02613bff 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -182,6 +182,9 @@ static int ehci_halt (struct ehci_hcd *ehci)
 {
         u32     temp = readl (&ehci->regs->status);
 
+        /* disable any irqs left enabled by previous code */
+        writel (0, &ehci->regs->intr_enable);
+
         if ((temp & STS_HALT) != 0)
                 return 0;
 
@@ -335,12 +338,17 @@ static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap)
 
 #endif
 
+/* Reboot notifiers kick in for silicon on any bus (not just pci, etc).
+ * This forcibly disables dma and IRQs, helping kexec and other cases
+ * where the next system software may expect clean state.
+ */
 static int
 ehci_reboot (struct notifier_block *self, unsigned long code, void *null)
 {
         struct ehci_hcd         *ehci;
 
         ehci = container_of (self, struct ehci_hcd, reboot_notifier);
+        (void) ehci_halt (ehci);
 
         /* make BIOS/etc use companion controller during reboot */
         writel (0, &ehci->regs->configured_flag);