Merge branch 'linux-2.6' into for-linus

1 files changed, 169 insertions, 68 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 66bff184a30c..0ce393eb3c4b 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -31,6 +31,47 @@
 #include "hcd.h"
 #include "hub.h"
 
+struct usb_hub {
+        struct device           *intfdev;       /* the "interface" device */
+        struct usb_device       *hdev;
+        struct urb              *urb;           /* for interrupt polling pipe */
+
+        /* buffer for urb ... with extra space in case of babble */
+        char                    (*buffer)[8];
+        dma_addr_t              buffer_dma;     /* DMA address for buffer */
+        union {
+                struct usb_hub_status   hub;
+                struct usb_port_status  port;
+        }                       *status;        /* buffer for status reports */
+
+        int                     error;          /* last reported error */
+        int                     nerrors;        /* track consecutive errors */
+
+        struct list_head        event_list;     /* hubs w/data or errs ready */
+        unsigned long           event_bits[1];  /* status change bitmask */
+        unsigned long           change_bits[1]; /* ports with logical connect
+                                                        status change */
+        unsigned long           busy_bits[1];   /* ports being reset or
+                                                        resumed */
+#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
+#error event_bits[] is too short!
+#endif
+
+        struct usb_hub_descriptor *descriptor;  /* class descriptor */
+        struct usb_tt           tt;             /* Transaction Translator */
+
+        unsigned                mA_per_port;    /* current for each child */
+
+        unsigned                limited_power:1;
+        unsigned                quiescing:1;
+        unsigned                activating:1;
+
+        unsigned                has_indicators:1;
+        u8                      indicator[USB_MAXCHILDREN];
+        struct work_struct      leds;
+};
+
+
 /* Protect struct usb_device->state and ->children members
  * Note: Both are also protected by ->dev.sem, except that ->state can
  * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
@@ -45,6 +86,16 @@ static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
 
 static struct task_struct *khubd_task;
 
+/* multithreaded probe logic */
+static int multithread_probe =
+#ifdef CONFIG_USB_MULTITHREAD_PROBE
+        1;
+#else
+        0;
+#endif
+module_param(multithread_probe, bool, S_IRUGO);
+MODULE_PARM_DESC(multithread_probe, "Run each USB device probe in a new thread");
+
 /* cycle leds on hubs that aren't blinking for attention */
 static int blinkenlights = 0;
 module_param (blinkenlights, bool, S_IRUGO);
@@ -276,6 +327,9 @@ static void kick_khubd(struct usb_hub *hub)
 {
         unsigned long   flags;
 
+        /* Suppress autosuspend until khubd runs */
+        to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
+
         spin_lock_irqsave(&hub_event_lock, flags);
         if (list_empty(&hub->event_list)) {
                 list_add_tail(&hub->event_list, &hub_event_list);
@@ -457,7 +511,6 @@ static void hub_quiesce(struct usb_hub *hub)
         /* (nonblocking) khubd and related activity won't re-trigger */
         hub->quiescing = 1;
         hub->activating = 0;
-        hub->resume_root_hub = 0;
 
         /* (blocking) stop khubd and related activity */
         usb_kill_urb(hub->urb);
@@ -473,7 +526,7 @@ static void hub_activate(struct usb_hub *hub)
 
         hub->quiescing = 0;
         hub->activating = 1;
-        hub->resume_root_hub = 0;
+
         status = usb_submit_urb(hub->urb, GFP_NOIO);
         if (status < 0)
                 dev_err(hub->intfdev, "activate --> %d\n", status);
@@ -759,7 +812,12 @@ static int hub_configure(struct usb_hub *hub,
                 dev_dbg(hub_dev, "%sover-current condition exists\n",
                         (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
 
-        /* set up the interrupt endpoint */
+        /* set up the interrupt endpoint
+         * We use the EP's maxpacket size instead of (PORTS+1+7)/8
+         * bytes as USB2.0[11.12.3] says because some hubs are known
+         * to send more data (and thus cause overflow). For root hubs,
+         * maxpktsize is defined in hcd.c's fake endpoint descriptors
+         * to be big enough for at least USB_MAXCHILDREN ports. */
         pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
         maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
 
@@ -883,6 +941,7 @@ descriptor_error:
         INIT_WORK(&hub->leds, led_work, hub);
 
         usb_set_intfdata (intf, hub);
+        intf->needs_remote_wakeup = 1;
 
         if (hdev->speed == USB_SPEED_HIGH)
                 highspeed_hubs++;
@@ -980,6 +1039,8 @@ static void recursively_mark_NOTATTACHED(struct usb_device *udev)
                 if (udev->children[i])
                         recursively_mark_NOTATTACHED(udev->children[i]);
         }
+        if (udev->state == USB_STATE_SUSPENDED)
+                udev->discon_suspended = 1;
         udev->state = USB_STATE_NOTATTACHED;
 }
 
@@ -1169,6 +1230,14 @@ void usb_disconnect(struct usb_device **pdev)
         *pdev = NULL;
         spin_unlock_irq(&device_state_lock);
 
+        /* Decrement the parent's count of unsuspended children */
+        if (udev->parent) {
+                usb_pm_lock(udev);
+                if (!udev->discon_suspended)
+                        usb_autosuspend_device(udev->parent);
+                usb_pm_unlock(udev);
+        }
+
         put_device(&udev->dev);
 }
 
@@ -1188,31 +1257,20 @@ static inline void show_string(struct usb_device *udev, char *id, char *string)
 
 #ifdef  CONFIG_USB_OTG
 #include "otg_whitelist.h"
+static int __usb_port_suspend(struct usb_device *, int port1);
 #endif
 
-/**
- * usb_new_device - perform initial device setup (usbcore-internal)
- * @udev: newly addressed device (in ADDRESS state)
- *
- * This is called with devices which have been enumerated, but not yet
- * configured.  The device descriptor is available, but not descriptors
- * for any device configuration.  The caller must have locked either
- * the parent hub (if udev is a normal device) or else the
- * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
- * udev has already been installed, but udev is not yet visible through
- * sysfs or other filesystem code.
- *
- * Returns 0 for success (device is configured and listed, with its
- * interfaces, in sysfs); else a negative errno value.
- *
- * This call is synchronous, and may not be used in an interrupt context.
- *
- * Only the hub driver or root-hub registrar should ever call this.
- */
-int usb_new_device(struct usb_device *udev)
+static int __usb_new_device(void *void_data)
 {
+        struct usb_device *udev = void_data;
         int err;
 
+        /* Lock ourself into memory in order to keep a probe sequence
+         * sleeping in a new thread from allowing us to be unloaded.
+         */
+        if (!try_module_get(THIS_MODULE))
+                return -EINVAL;
+
         err = usb_get_configuration(udev);
         if (err < 0) {
                 dev_err(&udev->dev, "can't read configurations, error %d\n",
@@ -1289,8 +1347,6 @@ int usb_new_device(struct usb_device *udev)
                  * (Includes HNP test device.)
                  */
                 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
-                        static int __usb_port_suspend(struct usb_device *,
-                                                int port1);
                         err = __usb_port_suspend(udev, udev->bus->otg_port);
                         if (err < 0)
                                 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
@@ -1310,13 +1366,56 @@ int usb_new_device(struct usb_device *udev)
                 goto fail;
         }
 
-        return 0;
+        /* Increment the parent's count of unsuspended children */
+        if (udev->parent)
+                usb_autoresume_device(udev->parent);
+
+exit:
+        module_put(THIS_MODULE);
+        return err;
 
 fail:
         usb_set_device_state(udev, USB_STATE_NOTATTACHED);
-        return err;
+        goto exit;
 }
 
+/**
+ * usb_new_device - perform initial device setup (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is called with devices which have been enumerated, but not yet
+ * configured.  The device descriptor is available, but not descriptors
+ * for any device configuration.  The caller must have locked either
+ * the parent hub (if udev is a normal device) or else the
+ * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
+ * udev has already been installed, but udev is not yet visible through
+ * sysfs or other filesystem code.
+ *
+ * The return value for this function depends on if the
+ * multithread_probe variable is set or not.  If it's set, it will
+ * return a if the probe thread was successfully created or not.  If the
+ * variable is not set, it will return if the device is configured
+ * properly or not.  interfaces, in sysfs); else a negative errno value.
+ *
+ * This call is synchronous, and may not be used in an interrupt context.
+ *
+ * Only the hub driver or root-hub registrar should ever call this.
+ */
+int usb_new_device(struct usb_device *udev)
+{
+        struct task_struct *probe_task;
+        int ret = 0;
+
+        if (multithread_probe) {
+                probe_task = kthread_run(__usb_new_device, udev,
+                                         "usb-probe-%s", udev->devnum);
+                if (IS_ERR(probe_task))
+                        ret = PTR_ERR(probe_task);
+        } else
+                ret = __usb_new_device(udev);
+
+        return ret;
+}
 
 static int hub_port_status(struct usb_hub *hub, int port1,
                                u16 *status, u16 *change)
@@ -1324,10 +1423,12 @@ static int hub_port_status(struct usb_hub *hub, int port1,
         int ret;
 
         ret = get_port_status(hub->hdev, port1, &hub->status->port);
-        if (ret < 0)
+        if (ret < 4) {
                 dev_err (hub->intfdev,
                         "%s failed (err = %d)\n", __FUNCTION__, ret);
-        else {
+                if (ret >= 0)
+                        ret = -EIO;
+        } else {
                 *status = le16_to_cpu(hub->status->port.wPortStatus);
                 *change = le16_to_cpu(hub->status->port.wPortChange); 
                 ret = 0;
@@ -1675,6 +1776,12 @@ static int
 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
 {
         int     status;
+        u16     portchange, portstatus;
+
+        /* Skip the initial Clear-Suspend step for a remote wakeup */
+        status = hub_port_status(hub, port1, &portstatus, &portchange);
+        if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
+                goto SuspendCleared;
 
         // dev_dbg(hub->intfdev, "resume port %d\n", port1);
 
@@ -1688,9 +1795,6 @@ hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
                         "can't resume port %d, status %d\n",
                         port1, status);
         } else {
-                u16             devstatus;
-                u16             portchange;
-
                 /* drive resume for at least 20 msec */
                 if (udev)
                         dev_dbg(&udev->dev, "usb %sresume\n",
@@ -1705,16 +1809,15 @@ hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
                  * stop resume signaling.  Then finish the resume
                  * sequence.
                  */
-                devstatus = portchange = 0;
-                status = hub_port_status(hub, port1,
-                                &devstatus, &portchange);
+                status = hub_port_status(hub, port1, &portstatus, &portchange);
+SuspendCleared:
                 if (status < 0
-                                || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
-                                || (devstatus & USB_PORT_STAT_SUSPEND) != 0
+                                || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
+                                || (portstatus & USB_PORT_STAT_SUSPEND) != 0
                                 ) {
                         dev_dbg(hub->intfdev,
                                 "port %d status %04x.%04x after resume, %d\n",
-                                port1, portchange, devstatus, status);
+                                port1, portchange, portstatus, status);
                         if (status >= 0)
                                 status = -ENODEV;
                 } else {
@@ -1775,23 +1878,16 @@ static int remote_wakeup(struct usb_device *udev)
 {
         int     status = 0;
 
-        /* All this just to avoid sending a port-resume message
-         * to the parent hub! */
-
         usb_lock_device(udev);
-        usb_pm_lock(udev);
         if (udev->state == USB_STATE_SUSPENDED) {
                 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
-                /* TRSMRCY = 10 msec */
-                msleep(10);
-                status = finish_port_resume(udev);
+                status = usb_autoresume_device(udev);
+
+                /* Give the interface drivers a chance to do something,
+                 * then autosuspend the device again. */
                 if (status == 0)
-                        udev->dev.power.power_state.event = PM_EVENT_ON;
+                        usb_autosuspend_device(udev);
         }
-        usb_pm_unlock(udev);
-
-        if (status == 0)
-                usb_autoresume_device(udev, 0);
         usb_unlock_device(udev);
         return status;
 }
@@ -1855,6 +1951,8 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
                 }
         }
 
+        dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
+
         /* "global suspend" of the downstream HC-to-USB interface */
         if (!hdev->parent) {
                 struct usb_bus  *bus = hdev->bus;
@@ -1877,10 +1975,12 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
 
 static int hub_resume(struct usb_interface *intf)
 {
-        struct usb_device       *hdev = interface_to_usbdev(intf);
         struct usb_hub          *hub = usb_get_intfdata (intf);
+        struct usb_device       *hdev = hub->hdev;
         int                     status;
 
+        dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
+
         /* "global resume" of the downstream HC-to-USB interface */
         if (!hdev->parent) {
                 struct usb_bus  *bus = hdev->bus;
@@ -1919,7 +2019,6 @@ void usb_resume_root_hub(struct usb_device *hdev)
 {
         struct usb_hub *hub = hdev_to_hub(hdev);
 
-        hub->resume_root_hub = 1;
         kick_khubd(hub);
 }
 
@@ -2556,16 +2655,13 @@ static void hub_events(void)
                 intf = to_usb_interface(hub->intfdev);
                 hub_dev = &intf->dev;
 
-                i = hub->resume_root_hub;
-
-                dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
+                dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
                                 hdev->state, hub->descriptor
                                         ? hub->descriptor->bNbrPorts
                                         : 0,
                                 /* NOTE: expects max 15 ports... */
                                 (u16) hub->change_bits[0],
-                                (u16) hub->event_bits[0],
-                                i ? ", resume root" : "");
+                                (u16) hub->event_bits[0]);
 
                 usb_get_intf(intf);
                 spin_unlock_irq(&hub_event_lock);
@@ -2586,16 +2682,16 @@ static void hub_events(void)
                         goto loop;
                 }
 
-                /* Is this is a root hub wanting to reactivate the downstream
-                 * ports?  If so, be sure the interface resumes even if its
-                 * stub "device" node was never suspended.
-                 */
-                if (i)
-                        usb_autoresume_device(hdev, 0);
+                /* Autoresume */
+                ret = usb_autopm_get_interface(intf);
+                if (ret) {
+                        dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
+                        goto loop;
+                }
 
-                /* If this is an inactive or suspended hub, do nothing */
+                /* If this is an inactive hub, do nothing */
                 if (hub->quiescing)
-                        goto loop;
+                        goto loop_autopm;
 
                 if (hub->error) {
                         dev_dbg (hub_dev, "resetting for error %d\n",
@@ -2605,7 +2701,7 @@ static void hub_events(void)
                         if (ret) {
                                 dev_dbg (hub_dev,
                                         "error resetting hub: %d\n", ret);
-                                goto loop;
+                                goto loop_autopm;
                         }
 
                         hub->nerrors = 0;
@@ -2733,6 +2829,10 @@ static void hub_events(void)
                 if (!hdev->parent && !hub->busy_bits[0])
                         usb_enable_root_hub_irq(hdev->bus);
 
+loop_autopm:
+                /* Allow autosuspend if we're not going to run again */
+                if (list_empty(&hub->event_list))
+                        usb_autopm_enable(intf);
 loop:
                 usb_unlock_device(hdev);
                 usb_put_intf(intf);
@@ -2774,6 +2874,7 @@ static struct usb_driver hub_driver = {
         .post_reset =   hub_post_reset,
         .ioctl =        hub_ioctl,
         .id_table =     hub_id_table,
+        .supports_autosuspend = 1,
 };
 
 int usb_hub_init(void)
@@ -2998,7 +3099,7 @@ int usb_reset_composite_device(struct usb_device *udev,
         }
 
         /* Prevent autosuspend during the reset */
-        usb_autoresume_device(udev, 1);
+        usb_autoresume_device(udev);
 
         if (iface && iface->condition != USB_INTERFACE_BINDING)
                 iface = NULL;
@@ -3041,7 +3142,7 @@ int usb_reset_composite_device(struct usb_device *udev,
                 }
         }
 
-        usb_autosuspend_device(udev, 1);
+        usb_autosuspend_device(udev);
         return ret;
 }
 EXPORT_SYMBOL(usb_reset_composite_device);