diff options
| -rw-r--r-- | drivers/usb/core/driver.c | 9 | ||||
| -rw-r--r-- | drivers/usb/core/hub.c | 15 |
2 files changed, 19 insertions, 5 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 4ed35231e552..2cdd5079ae78 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1754,10 +1754,13 @@ int usb_runtime_suspend(struct device *dev) if (status == -EAGAIN || status == -EBUSY) usb_mark_last_busy(udev); - /* The PM core reacts badly unless the return code is 0, - * -EAGAIN, or -EBUSY, so always return -EBUSY on an error. + /* + * The PM core reacts badly unless the return code is 0, + * -EAGAIN, or -EBUSY, so always return -EBUSY on an error + * (except for root hubs, because they don't suspend through + * an upstream port like other USB devices). */ - if (status != 0) + if (status != 0 && udev->parent) return -EBUSY; return status; } diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index a036e03ae1b3..46efdca96952 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1683,8 +1683,19 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) */ pm_runtime_set_autosuspend_delay(&hdev->dev, 0); - /* Hubs have proper suspend/resume support. */ - usb_enable_autosuspend(hdev); + /* + * Hubs have proper suspend/resume support, except for root hubs + * where the controller driver doesn't have bus_suspend and + * bus_resume methods. + */ + if (hdev->parent) { /* normal device */ + usb_enable_autosuspend(hdev); + } else { /* root hub */ + const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; + + if (drv->bus_suspend && drv->bus_resume) + usb_enable_autosuspend(hdev); + } if (hdev->level == MAX_TOPO_LEVEL) { dev_err(&intf->dev, |