diff options
Diffstat (limited to 'drivers/usb/core/hub.c')
| -rw-r--r-- | drivers/usb/core/hub.c | 57 |
1 files changed, 23 insertions, 34 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 7946d7b6c71..04d6fde57d8 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1333,7 +1333,6 @@ static inline void show_string(struct usb_device *udev, char *id, char *string) #ifdef CONFIG_USB_OTG #include "otg_whitelist.h" -static int __usb_port_suspend(struct usb_device *, int port1); #endif /** @@ -1439,7 +1438,7 @@ int usb_new_device(struct usb_device *udev) * (Includes HNP test device.) */ if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { - err = __usb_port_suspend(udev, udev->bus->otg_port); + err = usb_port_suspend(udev); if (err < 0) dev_dbg(&udev->dev, "HNP fail, %d\n", err); } @@ -1683,6 +1682,23 @@ static int hub_port_suspend(struct usb_hub *hub, int port1, } /* + * usb_port_suspend - suspend a usb device's upstream port + * @udev: device that's no longer in active use + * Context: must be able to sleep; device not locked; pm locks held + * + * Suspends a USB device that isn't in active use, conserving power. + * Devices may wake out of a suspend, if anything important happens, + * using the remote wakeup mechanism. They may also be taken out of + * suspend by the host, using usb_port_resume(). It's also routine + * to disconnect devices while they are suspended. + * + * This only affects the USB hardware for a device; its interfaces + * (and, for hubs, child devices) must already have been suspended. + * + * Suspending OTG devices may trigger HNP, if that's been enabled + * between a pair of dual-role devices. That will change roles, such + * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. + * * Devices on USB hub ports have only one "suspend" state, corresponding * to ACPI D2, "may cause the device to lose some context". * State transitions include: @@ -1699,21 +1715,19 @@ static int hub_port_suspend(struct usb_hub *hub, int port1, * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when * the root hub for their bus goes into global suspend ... so we don't * (falsely) update the device power state to say it suspended. + * + * Returns 0 on success, else negative errno. */ -static int __usb_port_suspend (struct usb_device *udev, int port1) +int usb_port_suspend(struct usb_device *udev) { int status = 0; - /* caller owns the udev device lock */ - if (port1 < 0) - return port1; - /* we change the device's upstream USB link, * but root hubs have no upstream USB link. */ if (udev->parent) - status = hub_port_suspend(hdev_to_hub(udev->parent), port1, - udev); + status = hub_port_suspend(hdev_to_hub(udev->parent), + udev->portnum, udev); else { dev_dbg(&udev->dev, "usb %ssuspend\n", udev->auto_pm ? "auto-" : ""); @@ -1723,31 +1737,6 @@ static int __usb_port_suspend (struct usb_device *udev, int port1) } /* - * usb_port_suspend - suspend a usb device's upstream port - * @udev: device that's no longer in active use - * Context: must be able to sleep; device not locked; pm locks held - * - * Suspends a USB device that isn't in active use, conserving power. - * Devices may wake out of a suspend, if anything important happens, - * using the remote wakeup mechanism. They may also be taken out of - * suspend by the host, using usb_port_resume(). It's also routine - * to disconnect devices while they are suspended. - * - * This only affects the USB hardware for a device; its interfaces - * (and, for hubs, child devices) must already have been suspended. - * - * Suspending OTG devices may trigger HNP, if that's been enabled - * between a pair of dual-role devices. That will change roles, such - * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. - * - * Returns 0 on success, else negative errno. - */ -int usb_port_suspend(struct usb_device *udev) -{ - return __usb_port_suspend(udev, udev->portnum); -} - -/* * If the USB "suspend" state is in use (rather than "global suspend"), * many devices will be individually taken out of suspend state using * special" resume" signaling. These routines kick in shortly after |