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path: root/drivers/usb/core/hcd.c
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Diffstat (limited to 'drivers/usb/core/hcd.c')
-rw-r--r--drivers/usb/core/hcd.c34
1 files changed, 28 insertions, 6 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index b26c19e8d19f..40cf882293e6 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -37,6 +37,7 @@
#include <asm/irq.h>
#include <asm/byteorder.h>
#include <linux/platform_device.h>
+#include <linux/workqueue.h>
#include <linux/usb.h>
@@ -544,6 +545,8 @@ void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
unsigned long flags;
char buffer[4]; /* Any root hubs with > 31 ports? */
+ if (unlikely(!hcd->rh_registered))
+ return;
if (!hcd->uses_new_polling && !hcd->status_urb)
return;
@@ -1296,14 +1299,26 @@ int hcd_bus_resume (struct usb_bus *bus)
return status;
}
+/* Workqueue routine for root-hub remote wakeup */
+static void hcd_resume_work(struct work_struct *work)
+{
+ struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
+ struct usb_device *udev = hcd->self.root_hub;
+
+ usb_lock_device(udev);
+ usb_mark_last_busy(udev);
+ usb_external_resume_device(udev);
+ usb_unlock_device(udev);
+}
+
/**
* usb_hcd_resume_root_hub - called by HCD to resume its root hub
* @hcd: host controller for this root hub
*
* 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 (that is, manage its downstream ports again).
+ * wakeup request is received. The routine submits a workqueue request
+ * to resume the root hub (that is, manage its downstream ports again).
*/
void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
{
@@ -1311,7 +1326,7 @@ void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
spin_lock_irqsave (&hcd_root_hub_lock, flags);
if (hcd->rh_registered)
- usb_resume_root_hub (hcd->self.root_hub);
+ queue_work(ksuspend_usb_wq, &hcd->wakeup_work);
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
}
EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
@@ -1500,6 +1515,9 @@ struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
init_timer(&hcd->rh_timer);
hcd->rh_timer.function = rh_timer_func;
hcd->rh_timer.data = (unsigned long) hcd;
+#ifdef CONFIG_PM
+ INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
+#endif
hcd->driver = driver;
hcd->product_desc = (driver->product_desc) ? driver->product_desc :
@@ -1666,16 +1684,20 @@ void usb_remove_hcd(struct usb_hcd *hcd)
hcd->rh_registered = 0;
spin_unlock_irq (&hcd_root_hub_lock);
+#ifdef CONFIG_PM
+ flush_workqueue(ksuspend_usb_wq);
+#endif
+
mutex_lock(&usb_bus_list_lock);
usb_disconnect(&hcd->self.root_hub);
mutex_unlock(&usb_bus_list_lock);
- hcd->poll_rh = 0;
- del_timer_sync(&hcd->rh_timer);
-
hcd->driver->stop(hcd);
hcd->state = HC_STATE_HALT;
+ hcd->poll_rh = 0;
+ del_timer_sync(&hcd->rh_timer);
+
if (hcd->irq >= 0)
free_irq(hcd->irq, hcd);
usb_deregister_bus(&hcd->self);