diff options
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/uhci-hcd.c | 16 |
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, |