diff options
Diffstat (limited to 'drivers/usb/core/driver.c')
| -rw-r--r-- | drivers/usb/core/driver.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index d938b2b99e31..6eab440e1542 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1196,9 +1196,14 @@ done: * * This is the central routine for suspending USB devices. It calls the * suspend methods for all the interface drivers in @udev and then calls - * the suspend method for @udev itself. If an error occurs at any stage, - * all the interfaces which were suspended are resumed so that they remain - * in the same state as the device. + * the suspend method for @udev itself. When the routine is called in + * autosuspend, if an error occurs at any stage, all the interfaces + * which were suspended are resumed so that they remain in the same + * state as the device, but when called from system sleep, all error + * from suspend methods of interfaces and the non-root-hub device itself + * are simply ignored, so all suspended interfaces are only resumed + * to the device's state when @udev is root-hub and its suspend method + * returns failure. * * Autosuspend requests originating from a child device or an interface * driver may be made without the protection of @udev's device lock, but @@ -1248,10 +1253,12 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) /* If the suspend failed, resume interfaces that did get suspended */ if (status != 0) { - msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); - while (++i < n) { - intf = udev->actconfig->interface[i]; - usb_resume_interface(udev, intf, msg, 0); + if (udev->actconfig) { + msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); + while (++i < n) { + intf = udev->actconfig->interface[i]; + usb_resume_interface(udev, intf, msg, 0); + } } /* If the suspend succeeded then prevent any more URB submissions @@ -1407,7 +1414,7 @@ int usb_resume(struct device *dev, pm_message_t msg) #endif /* CONFIG_PM */ -#ifdef CONFIG_USB_SUSPEND +#ifdef CONFIG_PM_RUNTIME /** * usb_enable_autosuspend - allow a USB device to be autosuspended @@ -1775,7 +1782,7 @@ int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable) return ret; } -#endif /* CONFIG_USB_SUSPEND */ +#endif /* CONFIG_PM_RUNTIME */ struct bus_type usb_bus_type = { .name = "usb", |