diff options
Diffstat (limited to 'drivers/usb/core/hcd.c')
| -rw-r--r-- | drivers/usb/core/hcd.c | 64 |
1 files changed, 57 insertions, 7 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 375382f9d671..de59bb515315 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -1143,10 +1143,20 @@ static int hcd_submit_urb (struct urb *urb, gfp_t mem_flags) else switch (hcd->state) { case HC_STATE_RUNNING: case HC_STATE_RESUMING: +doit: usb_get_dev (urb->dev); list_add_tail (&urb->urb_list, &ep->urb_list); status = 0; break; + case HC_STATE_SUSPENDED: + /* HC upstream links (register access, wakeup signaling) can work + * even when the downstream links (and DMA etc) are quiesced; let + * usbcore talk to the root hub. + */ + if (hcd->self.controller->power.power_state.event == PM_EVENT_ON + && urb->dev->parent == NULL) + goto doit; + /* FALL THROUGH */ default: status = -ESHUTDOWN; break; @@ -1294,12 +1304,6 @@ static int hcd_unlink_urb (struct urb *urb, int status) goto done; } - /* running ~= hc unlink handshake works (irq, timer, etc) - * halted ~= no unlink handshake is needed - * suspended, resuming == should never happen - */ - WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT); - /* insist the urb is still queued */ list_for_each(tmp, &ep->urb_list) { if (tmp == &urb->urb_list) @@ -1459,6 +1463,8 @@ static int hcd_hub_resume (struct usb_bus *bus) hcd = container_of (bus, struct usb_hcd, self); if (!hcd->driver->hub_resume) return -ENOENT; + if (hcd->state == HC_STATE_RUNNING) + return 0; hcd->state = HC_STATE_RESUMING; status = hcd->driver->hub_resume (hcd); if (status == 0) @@ -1471,6 +1477,50 @@ static int hcd_hub_resume (struct usb_bus *bus) return status; } +/* + * usb_hcd_suspend_root_hub - HCD autosuspends downstream ports + * @hcd: host controller for this root hub + * + * This call arranges that usb_hcd_resume_root_hub() is safe to call later; + * that the HCD's root hub polling is deactivated; and that the root's hub + * driver is suspended. HCDs may call this to autosuspend when their root + * hub's downstream ports are all inactive: unpowered, disconnected, + * disabled, or suspended. + * + * The HCD will autoresume on device connect change detection (using SRP + * or a D+/D- pullup). The HCD also autoresumes on remote wakeup signaling + * from any ports that are suspended (if that is enabled). In most cases, + * overcurrent signaling (on powered ports) will also start autoresume. + * + * Always called with IRQs blocked. + */ +void usb_hcd_suspend_root_hub (struct usb_hcd *hcd) +{ + struct urb *urb; + + spin_lock (&hcd_root_hub_lock); + usb_suspend_root_hub (hcd->self.root_hub); + + /* force status urb to complete/unlink while suspended */ + if (hcd->status_urb) { + urb = hcd->status_urb; + urb->status = -ECONNRESET; + urb->hcpriv = NULL; + urb->actual_length = 0; + + del_timer (&hcd->rh_timer); + hcd->poll_pending = 0; + hcd->status_urb = NULL; + } else + urb = NULL; + spin_unlock (&hcd_root_hub_lock); + hcd->state = HC_STATE_SUSPENDED; + + if (urb) + usb_hcd_giveback_urb (hcd, urb, NULL); +} +EXPORT_SYMBOL_GPL(usb_hcd_suspend_root_hub); + /** * usb_hcd_resume_root_hub - called by HCD to resume its root hub * @hcd: host controller for this root hub @@ -1478,7 +1528,7 @@ static int hcd_hub_resume (struct usb_bus *bus) * The USB host controller calls this function when its root hub is * suspended (with the remote wakeup feature enabled) and a remote * wakeup request is received. It queues a request for khubd to - * resume the root hub. + * resume the root hub (that is, manage its downstream ports again). */ void usb_hcd_resume_root_hub (struct usb_hcd *hcd) { |
