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-rw-r--r--drivers/usb/core/Kconfig2
-rw-r--r--drivers/usb/core/devio.c12
-rw-r--r--drivers/usb/core/driver.c3
-rw-r--r--drivers/usb/core/endpoint.c3
-rw-r--r--drivers/usb/core/file.c5
-rw-r--r--drivers/usb/core/hcd.c4
-rw-r--r--drivers/usb/core/hcd.h6
-rw-r--r--drivers/usb/core/hub.c102
-rw-r--r--drivers/usb/core/inode.c18
-rw-r--r--drivers/usb/core/message.c3
-rw-r--r--drivers/usb/core/sysfs.c24
-rw-r--r--drivers/usb/core/urb.c169
12 files changed, 314 insertions, 37 deletions
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index cc9f397e839..e1759d17ac5 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -134,5 +134,5 @@ config USB_OTG_BLACKLIST_HUB
If you say Y here, then Linux will refuse to enumerate
external hubs. OTG hosts are allowed to reduce hardware
and software costs by not supporting external hubs. So
- are "Emedded Hosts" that don't offer OTG support.
+ are "Embedded Hosts" that don't offer OTG support.
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 7a4fa791dc1..2bccefebff1 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -413,7 +413,8 @@ static void driver_disconnect(struct usb_interface *intf)
if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
clear_bit(ifnum, &ps->ifclaimed);
else
- warn("interface number %u out of range", ifnum);
+ dev_warn(&intf->dev, "interface number %u out of range\n",
+ ifnum);
usb_set_intfdata(intf, NULL);
@@ -624,6 +625,8 @@ static int usbdev_open(struct inode *inode, struct file *file)
smp_wmb();
list_add_tail(&ps->list, &dev->filelist);
file->private_data = ps;
+ snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
+ current->comm);
out:
if (ret) {
kfree(ps);
@@ -1774,19 +1777,20 @@ int __init usb_devio_init(void)
retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
"usb_device");
if (retval) {
- err("unable to register minors for usb_device");
+ printk(KERN_ERR "Unable to register minors for usb_device\n");
goto out;
}
cdev_init(&usb_device_cdev, &usbdev_file_operations);
retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
if (retval) {
- err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
+ printk(KERN_ERR "Unable to get usb_device major %d\n",
+ USB_DEVICE_MAJOR);
goto error_cdev;
}
#ifdef CONFIG_USB_DEVICE_CLASS
usb_classdev_class = class_create(THIS_MODULE, "usb_device");
if (IS_ERR(usb_classdev_class)) {
- err("unable to register usb_device class");
+ printk(KERN_ERR "Unable to register usb_device class\n");
retval = PTR_ERR(usb_classdev_class);
cdev_del(&usb_device_cdev);
usb_classdev_class = NULL;
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 5a7fa6f0995..e935be7eb46 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1070,7 +1070,8 @@ static int autosuspend_check(struct usb_device *udev, int reschedule)
struct usb_driver *driver;
driver = to_usb_driver(intf->dev.driver);
- if (!driver->reset_resume)
+ if (!driver->reset_resume ||
+ intf->needs_remote_wakeup)
return -EOPNOTSUPP;
}
}
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index 22912136fc1..946fae43d62 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -169,7 +169,8 @@ static int usb_endpoint_major_init(void)
error = alloc_chrdev_region(&dev, 0, MAX_ENDPOINT_MINORS,
"usb_endpoint");
if (error) {
- err("unable to get a dynamic major for usb endpoints");
+ printk(KERN_ERR "Unable to get a dynamic major for "
+ "usb endpoints.\n");
return error;
}
usb_endpoint_major = MAJOR(dev);
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c
index 55f7f310924..997e659ff69 100644
--- a/drivers/usb/core/file.c
+++ b/drivers/usb/core/file.c
@@ -86,7 +86,7 @@ static int init_usb_class(void)
usb_class->class = class_create(THIS_MODULE, "usb");
if (IS_ERR(usb_class->class)) {
result = IS_ERR(usb_class->class);
- err("class_create failed for usb devices");
+ printk(KERN_ERR "class_create failed for usb devices\n");
kfree(usb_class);
usb_class = NULL;
}
@@ -115,7 +115,8 @@ int usb_major_init(void)
error = register_chrdev(USB_MAJOR, "usb", &usb_fops);
if (error)
- err("unable to get major %d for usb devices", USB_MAJOR);
+ printk(KERN_ERR "Unable to get major %d for usb devices\n",
+ USB_MAJOR);
return error;
}
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index c8035a8216b..fc9018e72a0 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -81,6 +81,10 @@
/*-------------------------------------------------------------------------*/
+/* Keep track of which host controller drivers are loaded */
+unsigned long usb_hcds_loaded;
+EXPORT_SYMBOL_GPL(usb_hcds_loaded);
+
/* host controllers we manage */
LIST_HEAD (usb_bus_list);
EXPORT_SYMBOL_GPL (usb_bus_list);
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index e710ce04e22..2dcde61c465 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -482,4 +482,10 @@ static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
*/
extern struct rw_semaphore ehci_cf_port_reset_rwsem;
+/* Keep track of which host controller drivers are loaded */
+#define USB_UHCI_LOADED 0
+#define USB_OHCI_LOADED 1
+#define USB_EHCI_LOADED 2
+extern unsigned long usb_hcds_loaded;
+
#endif /* __KERNEL__ */
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index d99963873e3..d73ce262c36 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -77,6 +77,7 @@ struct usb_hub {
unsigned has_indicators:1;
u8 indicator[USB_MAXCHILDREN];
struct delayed_work leds;
+ struct delayed_work init_work;
};
@@ -100,6 +101,15 @@ module_param (blinkenlights, bool, S_IRUGO);
MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
/*
+ * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
+ * 10 seconds to send reply for the initial 64-byte descriptor request.
+ */
+/* define initial 64-byte descriptor request timeout in milliseconds */
+static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
+module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(initial_descriptor_timeout, "initial 64-byte descriptor request timeout in milliseconds (default 5000 - 5.0 seconds)");
+
+/*
* As of 2.6.10 we introduce a new USB device initialization scheme which
* closely resembles the way Windows works. Hopefully it will be compatible
* with a wider range of devices than the old scheme. However some previously
@@ -515,10 +525,14 @@ void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
}
EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer);
-static void hub_power_on(struct usb_hub *hub)
+/* If do_delay is false, return the number of milliseconds the caller
+ * needs to delay.
+ */
+static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
{
int port1;
unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
+ unsigned delay;
u16 wHubCharacteristics =
le16_to_cpu(hub->descriptor->wHubCharacteristics);
@@ -537,7 +551,10 @@ static void hub_power_on(struct usb_hub *hub)
set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
/* Wait at least 100 msec for power to become stable */
- msleep(max(pgood_delay, (unsigned) 100));
+ delay = max(pgood_delay, (unsigned) 100);
+ if (do_delay)
+ msleep(delay);
+ return delay;
}
static int hub_hub_status(struct usb_hub *hub,
@@ -599,21 +616,55 @@ static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
}
enum hub_activation_type {
- HUB_INIT, HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME
+ HUB_INIT, HUB_INIT2, HUB_INIT3,
+ HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
};
+static void hub_init_func2(struct work_struct *ws);
+static void hub_init_func3(struct work_struct *ws);
+
static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
{
struct usb_device *hdev = hub->hdev;
int port1;
int status;
bool need_debounce_delay = false;
+ unsigned delay;
+
+ /* Continue a partial initialization */
+ if (type == HUB_INIT2)
+ goto init2;
+ if (type == HUB_INIT3)
+ goto init3;
/* After a resume, port power should still be on.
* For any other type of activation, turn it on.
*/
- if (type != HUB_RESUME)
- hub_power_on(hub);
+ if (type != HUB_RESUME) {
+
+ /* Speed up system boot by using a delayed_work for the
+ * hub's initial power-up delays. This is pretty awkward
+ * and the implementation looks like a home-brewed sort of
+ * setjmp/longjmp, but it saves at least 100 ms for each
+ * root hub (assuming usbcore is compiled into the kernel
+ * rather than as a module). It adds up.
+ *
+ * This can't be done for HUB_RESUME or HUB_RESET_RESUME
+ * because for those activation types the ports have to be
+ * operational when we return. In theory this could be done
+ * for HUB_POST_RESET, but it's easier not to.
+ */
+ if (type == HUB_INIT) {
+ delay = hub_power_on(hub, false);
+ PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
+ schedule_delayed_work(&hub->init_work,
+ msecs_to_jiffies(delay));
+ return; /* Continues at init2: below */
+ } else {
+ hub_power_on(hub, true);
+ }
+ }
+ init2:
/* Check each port and set hub->change_bits to let khubd know
* which ports need attention.
@@ -692,9 +743,20 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
* If any port-status changes do occur during this delay, khubd
* will see them later and handle them normally.
*/
- if (need_debounce_delay)
- msleep(HUB_DEBOUNCE_STABLE);
-
+ if (need_debounce_delay) {
+ delay = HUB_DEBOUNCE_STABLE;
+
+ /* Don't do a long sleep inside a workqueue routine */
+ if (type == HUB_INIT2) {
+ PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
+ schedule_delayed_work(&hub->init_work,
+ msecs_to_jiffies(delay));
+ return; /* Continues at init3: below */
+ } else {
+ msleep(delay);
+ }
+ }
+ init3:
hub->quiescing = 0;
status = usb_submit_urb(hub->urb, GFP_NOIO);
@@ -707,6 +769,21 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
kick_khubd(hub);
}
+/* Implement the continuations for the delays above */
+static void hub_init_func2(struct work_struct *ws)
+{
+ struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
+
+ hub_activate(hub, HUB_INIT2);
+}
+
+static void hub_init_func3(struct work_struct *ws)
+{
+ struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
+
+ hub_activate(hub, HUB_INIT3);
+}
+
enum hub_quiescing_type {
HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
};
@@ -716,6 +793,8 @@ static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
struct usb_device *hdev = hub->hdev;
int i;
+ cancel_delayed_work_sync(&hub->init_work);
+
/* khubd and related activity won't re-trigger */
hub->quiescing = 1;
@@ -1099,6 +1178,7 @@ descriptor_error:
hub->intfdev = &intf->dev;
hub->hdev = hdev;
INIT_DELAYED_WORK(&hub->leds, led_work);
+ INIT_DELAYED_WORK(&hub->init_work, NULL);
usb_get_intf(intf);
usb_set_intfdata (intf, hub);
@@ -2467,7 +2547,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
USB_DT_DEVICE << 8, 0,
buf, GET_DESCRIPTOR_BUFSIZE,
- USB_CTRL_GET_TIMEOUT);
+ initial_descriptor_timeout);
switch (buf->bMaxPacketSize0) {
case 8: case 16: case 32: case 64: case 255:
if (buf->bDescriptorType ==
@@ -3035,7 +3115,7 @@ static void hub_events(void)
i);
clear_port_feature(hdev, i,
USB_PORT_FEAT_C_OVER_CURRENT);
- hub_power_on(hub);
+ hub_power_on(hub, true);
}
if (portchange & USB_PORT_STAT_C_RESET) {
@@ -3070,7 +3150,7 @@ static void hub_events(void)
dev_dbg (hub_dev, "overcurrent change\n");
msleep(500); /* Cool down */
clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
- hub_power_on(hub);
+ hub_power_on(hub, true);
}
}
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 77fa7a08080..94632264dcc 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -180,8 +180,8 @@ static int parse_options(struct super_block *s, char *data)
listmode = option & S_IRWXUGO;
break;
default:
- err("usbfs: unrecognised mount option \"%s\" "
- "or missing value\n", p);
+ printk(KERN_ERR "usbfs: unrecognised mount option "
+ "\"%s\" or missing value\n", p);
return -EINVAL;
}
}
@@ -240,7 +240,9 @@ static void update_sb(struct super_block *sb)
update_special(bus);
break;
default:
- warn("Unknown node %s mode %x found on remount!\n",bus->d_name.name,bus->d_inode->i_mode);
+ printk(KERN_WARNING "usbfs: Unknown node %s "
+ "mode %x found on remount!\n",
+ bus->d_name.name, bus->d_inode->i_mode);
break;
}
}
@@ -259,7 +261,7 @@ static int remount(struct super_block *sb, int *flags, char *data)
return 0;
if (parse_options(sb, data)) {
- warn("usbfs: mount parameter error:");
+ printk(KERN_WARNING "usbfs: mount parameter error.\n");
return -EINVAL;
}
@@ -599,7 +601,7 @@ static int create_special_files (void)
/* create the devices special file */
retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
if (retval) {
- err ("Unable to get usbfs mount");
+ printk(KERN_ERR "Unable to get usbfs mount\n");
goto exit;
}
@@ -611,7 +613,7 @@ static int create_special_files (void)
NULL, &usbfs_devices_fops,
listuid, listgid);
if (devices_usbfs_dentry == NULL) {
- err ("Unable to create devices usbfs file");
+ printk(KERN_ERR "Unable to create devices usbfs file\n");
retval = -ENODEV;
goto error_clean_mounts;
}
@@ -663,7 +665,7 @@ static void usbfs_add_bus(struct usb_bus *bus)
bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
bus, NULL, busuid, busgid);
if (bus->usbfs_dentry == NULL) {
- err ("error creating usbfs bus entry");
+ printk(KERN_ERR "Error creating usbfs bus entry\n");
return;
}
}
@@ -694,7 +696,7 @@ static void usbfs_add_device(struct usb_device *dev)
&usbdev_file_operations,
devuid, devgid);
if (dev->usbfs_dentry == NULL) {
- err ("error creating usbfs device entry");
+ printk(KERN_ERR "Error creating usbfs device entry\n");
return;
}
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 286b4431a09..887738577b2 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1204,7 +1204,8 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
alt = usb_altnum_to_altsetting(iface, alternate);
if (!alt) {
- warn("selecting invalid altsetting %d", alternate);
+ dev_warn(&dev->dev, "selecting invalid altsetting %d",
+ alternate);
return -EINVAL;
}
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 5e1f5d55bf0..f66fba11fbd 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -743,6 +743,29 @@ static ssize_t show_modalias(struct device *dev,
}
static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
+static ssize_t show_supports_autosuspend(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf;
+ struct usb_device *udev;
+ int ret;
+
+ intf = to_usb_interface(dev);
+ udev = interface_to_usbdev(intf);
+
+ usb_lock_device(udev);
+ /* Devices will be autosuspended even when an interface isn't claimed */
+ if (!intf->dev.driver ||
+ to_usb_driver(intf->dev.driver)->supports_autosuspend)
+ ret = sprintf(buf, "%u\n", 1);
+ else
+ ret = sprintf(buf, "%u\n", 0);
+ usb_unlock_device(udev);
+
+ return ret;
+}
+static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
+
static struct attribute *intf_attrs[] = {
&dev_attr_bInterfaceNumber.attr,
&dev_attr_bAlternateSetting.attr,
@@ -751,6 +774,7 @@ static struct attribute *intf_attrs[] = {
&dev_attr_bInterfaceSubClass.attr,
&dev_attr_bInterfaceProtocol.attr,
&dev_attr_modalias.attr,
+ &dev_attr_supports_autosuspend.attr,
NULL,
};
static struct attribute_group intf_attr_grp = {
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 47111e88f79..f2638009a46 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -10,6 +10,8 @@
#define to_urb(d) container_of(d, struct urb, kref)
+static DEFINE_SPINLOCK(usb_reject_lock);
+
static void urb_destroy(struct kref *kref)
{
struct urb *urb = to_urb(kref);
@@ -68,7 +70,7 @@ struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags)
iso_packets * sizeof(struct usb_iso_packet_descriptor),
mem_flags);
if (!urb) {
- err("alloc_urb: kmalloc failed");
+ printk(KERN_ERR "alloc_urb: kmalloc failed\n");
return NULL;
}
usb_init_urb(urb);
@@ -127,6 +129,13 @@ void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor)
usb_get_urb(urb);
list_add_tail(&urb->anchor_list, &anchor->urb_list);
urb->anchor = anchor;
+
+ if (unlikely(anchor->poisoned)) {
+ spin_lock(&usb_reject_lock);
+ urb->reject++;
+ spin_unlock(&usb_reject_lock);
+ }
+
spin_unlock_irqrestore(&anchor->lock, flags);
}
EXPORT_SYMBOL_GPL(usb_anchor_urb);
@@ -398,7 +407,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
/* fail if submitter gave bogus flags */
if (urb->transfer_flags != orig_flags) {
- err("BOGUS urb flags, %x --> %x",
+ dev_err(&dev->dev, "BOGUS urb flags, %x --> %x\n",
orig_flags, urb->transfer_flags);
return -EINVAL;
}
@@ -544,25 +553,70 @@ EXPORT_SYMBOL_GPL(usb_unlink_urb);
*/
void usb_kill_urb(struct urb *urb)
{
- static DEFINE_MUTEX(reject_mutex);
-
might_sleep();
if (!(urb && urb->dev && urb->ep))
return;
- mutex_lock(&reject_mutex);
+ spin_lock_irq(&usb_reject_lock);
++urb->reject;
- mutex_unlock(&reject_mutex);
+ spin_unlock_irq(&usb_reject_lock);
usb_hcd_unlink_urb(urb, -ENOENT);
wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0);
- mutex_lock(&reject_mutex);
+ spin_lock_irq(&usb_reject_lock);
--urb->reject;
- mutex_unlock(&reject_mutex);
+ spin_unlock_irq(&usb_reject_lock);
}
EXPORT_SYMBOL_GPL(usb_kill_urb);
/**
+ * usb_poison_urb - reliably kill a transfer and prevent further use of an URB
+ * @urb: pointer to URB describing a previously submitted request,
+ * may be NULL
+ *
+ * This routine cancels an in-progress request. It is guaranteed that
+ * upon return all completion handlers will have finished and the URB
+ * will be totally idle and cannot be reused. These features make
+ * this an ideal way to stop I/O in a disconnect() callback.
+ * If the request has not already finished or been unlinked
+ * the completion handler will see urb->status == -ENOENT.
+ *
+ * After and while the routine runs, attempts to resubmit the URB will fail
+ * with error -EPERM. Thus even if the URB's completion handler always
+ * tries to resubmit, it will not succeed and the URB will become idle.
+ *
+ * This routine may not be used in an interrupt context (such as a bottom
+ * half or a completion handler), or when holding a spinlock, or in other
+ * situations where the caller can't schedule().
+ */
+void usb_poison_urb(struct urb *urb)
+{
+ might_sleep();
+ if (!(urb && urb->dev && urb->ep))
+ return;
+ spin_lock_irq(&usb_reject_lock);
+ ++urb->reject;
+ spin_unlock_irq(&usb_reject_lock);
+
+ usb_hcd_unlink_urb(urb, -ENOENT);
+ wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0);
+}
+EXPORT_SYMBOL_GPL(usb_poison_urb);
+
+void usb_unpoison_urb(struct urb *urb)
+{
+ unsigned long flags;
+
+ if (!urb)
+ return;
+
+ spin_lock_irqsave(&usb_reject_lock, flags);
+ --urb->reject;
+ spin_unlock_irqrestore(&usb_reject_lock, flags);
+}
+EXPORT_SYMBOL_GPL(usb_unpoison_urb);
+
+/**
* usb_kill_anchored_urbs - cancel transfer requests en masse
* @anchor: anchor the requests are bound to
*
@@ -589,6 +643,35 @@ void usb_kill_anchored_urbs(struct usb_anchor *anchor)
}
EXPORT_SYMBOL_GPL(usb_kill_anchored_urbs);
+
+/**
+ * usb_poison_anchored_urbs - cease all traffic from an anchor
+ * @anchor: anchor the requests are bound to
+ *
+ * this allows all outstanding URBs to be poisoned starting
+ * from the back of the queue. Newly added URBs will also be
+ * poisoned
+ */
+void usb_poison_anchored_urbs(struct usb_anchor *anchor)
+{
+ struct urb *victim;
+
+ spin_lock_irq(&anchor->lock);
+ anchor->poisoned = 1;
+ while (!list_empty(&anchor->urb_list)) {
+ victim = list_entry(anchor->urb_list.prev, struct urb,
+ anchor_list);
+ /* we must make sure the URB isn't freed before we kill it*/
+ usb_get_urb(victim);
+ spin_unlock_irq(&anchor->lock);
+ /* this will unanchor the URB */
+ usb_poison_urb(victim);
+ usb_put_urb(victim);
+ spin_lock_irq(&anchor->lock);
+ }
+ spin_unlock_irq(&anchor->lock);
+}
+EXPORT_SYMBOL_GPL(usb_poison_anchored_urbs);
/**
* usb_unlink_anchored_urbs - asynchronously cancel transfer requests en masse
* @anchor: anchor the requests are bound to
@@ -633,3 +716,73 @@ int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor,
msecs_to_jiffies(timeout));
}
EXPORT_SYMBOL_GPL(usb_wait_anchor_empty_timeout);
+
+/**
+ * usb_get_from_anchor - get an anchor's oldest urb
+ * @anchor: the anchor whose urb you want
+ *
+ * this will take the oldest urb from an anchor,
+ * unanchor and return it
+ */
+struct urb *usb_get_from_anchor(struct usb_anchor *anchor)
+{
+ struct urb *victim;
+ unsigned long flags;
+
+ spin_lock_irqsave(&anchor->lock, flags);
+ if (!list_empty(&anchor->urb_list)) {
+ victim = list_entry(anchor->urb_list.next, struct urb,
+ anchor_list);
+ usb_get_urb(victim);
+ spin_unlock_irqrestore(&anchor->lock, flags);
+ usb_unanchor_urb(victim);
+ } else {
+ spin_unlock_irqrestore(&anchor->lock, flags);
+ victim = NULL;
+ }
+
+ return victim;
+}
+
+EXPORT_SYMBOL_GPL(usb_get_from_anchor);
+
+/**
+ * usb_scuttle_anchored_urbs - unanchor all an anchor's urbs
+ * @anchor: the anchor whose urbs you want to unanchor
+ *
+ * use this to get rid of all an anchor's urbs
+ */
+void usb_scuttle_anchored_urbs(struct usb_anchor *anchor)
+{
+ struct urb *victim;
+ unsigned long flags;
+
+ spin_lock_irqsave(&anchor->lock, flags);
+ while (!list_empty(&anchor->urb_list)) {
+ victim = list_entry(anchor->urb_list.prev, struct urb,
+ anchor_list);
+ usb_get_urb(victim);
+ spin_unlock_irqrestore(&anchor->lock, flags);
+ /* this may free the URB */
+ usb_unanchor_urb(victim);
+ usb_put_urb(victim);
+ spin_lock_irqsave(&anchor->lock, flags);
+ }
+ spin_unlock_irqrestore(&anchor->lock, flags);
+}
+
+EXPORT_SYMBOL_GPL(usb_scuttle_anchored_urbs);
+
+/**
+ * usb_anchor_empty - is an anchor empty
+ * @anchor: the anchor you want to query
+ *
+ * returns 1 if the anchor has no urbs associated with it
+ */
+int usb_anchor_empty(struct usb_anchor *anchor)
+{
+ return list_empty(&anchor->urb_list);
+}
+
+EXPORT_SYMBOL_GPL(usb_anchor_empty);
+