[PATCH] USB UHCI: Add shutdown method

After all the discussion you might not be interested in this still, but
nevertheless here it is.  This patch adds a shutdown method to the
uhci-hcd driver.  Its prerequisite is the patch you wrote adding shutdown
support for PCI.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index cec070fa8c83..53ba8a56592e 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -154,6 +154,7 @@ static void reset_hc(struct uhci_hcd *uhci)
 
 /*
  * Last rites for a defunct/nonfunctional controller
+ * or one we don't want to use any more.
  */
 static void hc_died(struct uhci_hcd *uhci)
 {
@@ -525,6 +526,20 @@ static int uhci_reset(struct usb_hcd *hcd)
         return 0;
 }
 
+/* Make sure the controller is quiescent and that we're not using it
+ * any more.  This is mainly for the benefit of programs which, like kexec,
+ * expect the hardware to be idle: not doing DMA or generating IRQs.
+ *
+ * This routine may be called in a damaged or failing kernel.  Hence we
+ * do not acquire the spinlock before shutting down the controller.
+ */
+static void uhci_shutdown(struct pci_dev *pdev)
+{
+        struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev);
+
+        hc_died(hcd_to_uhci(hcd));
+}
+
 /*
  * Allocate a frame list, and then setup the skeleton
  *
@@ -939,6 +954,7 @@ static struct pci_driver uhci_pci_driver = {
 
         .probe =        usb_hcd_pci_probe,
         .remove =       usb_hcd_pci_remove,
+        .shutdown =     uhci_shutdown,
 
 #ifdef  CONFIG_PM
         .suspend =      usb_hcd_pci_suspend,