[ACPI] merge acpi-2.6.12 branch into latest Linux 2.6.13-rc...

[linux-2.6-omap-h63xx.git] / drivers / usb / core / hub.c

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index d2d648ee864009cc028d2ce539ffede88f9bf17f..c3e46d24a37ed0a93c8f1c2d39c27c30617b4435 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -26,6 +26,7 @@
 #include <linux/ioctl.h>
 #include <linux/usb.h>
 #include <linux/usbdevice_fs.h>
+#include <linux/kthread.h>
 
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
@@ -47,8 +48,7 @@ static LIST_HEAD(hub_event_list);     /* List of hubs needing servicing */
 /* Wakes up khubd */
 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
 
-static pid_t khubd_pid = 0;                    /* PID of khubd */
-static DECLARE_COMPLETION(khubd_exited);
+static struct task_struct *khubd_task;
 
 /* cycle leds on hubs that aren't blinking for attention */
 static int blinkenlights = 0;
@@ -643,15 +643,21 @@ static int hub_configure(struct usb_hub *hub,
                message = "can't get hub status";
                goto fail;
        }
-       cpu_to_le16s(&hubstatus);
-       if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
+       le16_to_cpus(&hubstatus);
+       if (hdev == hdev->bus->root_hub) {
+               struct usb_hcd *hcd =
+                               container_of(hdev->bus, struct usb_hcd, self);
+
+               hub->power_budget = min(500u, hcd->power_budget) / 2;
+       } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
                dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
                        hub->descriptor->bHubContrCurrent);
                hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
                                        / 2;
+       }
+       if (hub->power_budget)
                dev_dbg(hub_dev, "%dmA bus power budget for children\n",
                        hub->power_budget * 2);
-       }
 
 
        ret = hub_hub_status(hub, &hubstatus, &hubchange);
@@ -1727,7 +1733,7 @@ static int finish_port_resume(struct usb_device *udev)
                        struct usb_driver       *driver;
 
                        intf = udev->actconfig->interface[i];
-                       if (intf->dev.power.power_state == PMSG_SUSPEND)
+                       if (intf->dev.power.power_state == PMSG_ON)
                                continue;
                        if (!intf->dev.driver) {
                                /* FIXME maybe force to alt 0 */
@@ -2787,6 +2793,11 @@ static void hub_events(void)
 
                hub->activating = 0;
 
+               /* If this is a root hub, tell the HCD it's okay to
+                * re-enable port-change interrupts now. */
+               if (!hdev->parent)
+                       usb_enable_root_hub_irq(hdev->bus);
+
 loop:
                usb_unlock_device(hdev);
                usb_put_intf(intf);
@@ -2796,23 +2807,16 @@ loop:
 
 static int hub_thread(void *__unused)
 {
-       /*
-        * This thread doesn't need any user-level access,
-        * so get rid of all our resources
-        */
-
-       daemonize("khubd");
-       allow_signal(SIGKILL);
-
-       /* Send me a signal to get me die (for debugging) */
        do {
                hub_events();
-               wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list)); 
-               try_to_freeze(PF_FREEZE);
-       } while (!signal_pending(current));
+               wait_event_interruptible(khubd_wait,
+                               !list_empty(&hub_event_list) ||
+                               kthread_should_stop());
+               try_to_freeze();
+       } while (!kthread_should_stop() || !list_empty(&hub_event_list));
 
-       pr_debug ("%s: khubd exiting\n", usbcore_name);
-       complete_and_exit(&khubd_exited, 0);
+       pr_debug("%s: khubd exiting\n", usbcore_name);
+       return 0;
 }
 
 static struct usb_device_id hub_id_table [] = {
@@ -2838,20 +2842,15 @@ static struct usb_driver hub_driver = {
 
 int usb_hub_init(void)
 {
-       pid_t pid;
-
        if (usb_register(&hub_driver) < 0) {
                printk(KERN_ERR "%s: can't register hub driver\n",
                        usbcore_name);
                return -1;
        }
 
-       pid = kernel_thread(hub_thread, NULL, CLONE_KERNEL);
-       if (pid >= 0) {
-               khubd_pid = pid;
-
+       khubd_task = kthread_run(hub_thread, NULL, "khubd");
+       if (!IS_ERR(khubd_task))
                return 0;
-       }
 
        /* Fall through if kernel_thread failed */
        usb_deregister(&hub_driver);
@@ -2862,12 +2861,7 @@ int usb_hub_init(void)
 
 void usb_hub_cleanup(void)
 {
-       int ret;
-
-       /* Kill the thread */
-       ret = kill_proc(khubd_pid, SIGKILL, 1);
-
-       wait_for_completion(&khubd_exited);
+       kthread_stop(khubd_task);
 
        /*
         * Hub resources are freed for us by usb_deregister. It calls
@@ -2879,7 +2873,6 @@ void usb_hub_cleanup(void)
        usb_deregister(&hub_driver);
 } /* usb_hub_cleanup() */
 
-
 static int config_descriptors_changed(struct usb_device *udev)
 {
        unsigned                        index;