diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/hub.c | 54 |
1 files changed, 39 insertions, 15 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 02601f412f9d..895ac829b9cf 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1648,15 +1648,22 @@ static int __usb_suspend_device (struct usb_device *udev, int port1) int usb_suspend_device(struct usb_device *udev) { #ifdef CONFIG_USB_SUSPEND - int port1, status; + int port1; - port1 = locktree(udev); - if (port1 < 0) - return port1; + if (udev->state == USB_STATE_NOTATTACHED) + return -ENODEV; + if (!udev->parent) + port1 = 0; + else { + for (port1 = udev->parent->maxchild; port1 > 0; --port1) { + if (udev->parent->children[port1-1] == udev) + break; + } + if (port1 == 0) + return -ENODEV; + } - status = __usb_suspend_device(udev, port1); - usb_unlock_device(udev); - return status; + return __usb_suspend_device(udev, port1); #else /* NOTE: udev->state unchanged, it's not lying ... */ udev->dev.power.power_state = PMSG_SUSPEND; @@ -1688,6 +1695,7 @@ static int finish_device_resume(struct usb_device *udev) usb_set_device_state(udev, udev->actconfig ? USB_STATE_CONFIGURED : USB_STATE_ADDRESS); + udev->dev.power.power_state = PMSG_ON; /* 10.5.4.5 says be sure devices in the tree are still there. * For now let's assume the device didn't go crazy on resume, @@ -1723,8 +1731,14 @@ static int finish_device_resume(struct usb_device *udev) * may have a child resume event to deal with soon */ resume = udev->dev.bus->resume; - for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) - (void) resume(&udev->actconfig->interface[i]->dev); + for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { + struct device *dev = + &udev->actconfig->interface[i]->dev; + + down(&dev->sem); + (void) resume(dev); + up(&dev->sem); + } status = 0; } else if (udev->devnum <= 0) { @@ -1809,9 +1823,18 @@ int usb_resume_device(struct usb_device *udev) { int port1, status; - port1 = locktree(udev); - if (port1 < 0) - return port1; + if (udev->state == USB_STATE_NOTATTACHED) + return -ENODEV; + if (!udev->parent) + port1 = 0; + else { + for (port1 = udev->parent->maxchild; port1 > 0; --port1) { + if (udev->parent->children[port1-1] == udev) + break; + } + if (port1 == 0) + return -ENODEV; + } #ifdef CONFIG_USB_SUSPEND /* selective resume of one downstream hub-to-device port */ @@ -1830,11 +1853,12 @@ int usb_resume_device(struct usb_device *udev) dev_dbg(&udev->dev, "can't resume, status %d\n", status); - usb_unlock_device(udev); - /* rebind drivers that had no suspend() */ - if (status == 0) + if (status == 0) { + usb_unlock_device(udev); bus_rescan_devices(&usb_bus_type); + usb_lock_device(udev); + } return status; } |