Move child's pointer to the struct usb_hub_port since the child device
is directly associated with the port. Provide usb_get_hub_child()
to get child's pointer and macrio macro usb_get_hub_each_child to
iterate all child devices on the hub. The child device's refcount will
be increased before return. The caller should invoke usb_put_dev() to
decrease the device's refcount when the child will not be used.
In the usb_get_hub_child(), still check the port1 param since the
usb_get_hub_each_child() will pass maxchild+1 as port1 at end of last
loop.
v3
add marco usb_get_hub_each_child() to iterate all hub devices
usb_get_hub_child() increases child's refcount before return
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/staging/usbip/usbip_common.c | 3 +-
drivers/usb/core/devices.c | 11 +++--
drivers/usb/core/hub.c | 81 +++++++++++++++++++++++-----------
drivers/usb/host/r8a66597-hcd.c | 10 ++--
include/linux/usb.h | 17 ++++++-
5 files changed, 82 insertions(+), 40 deletions(-)
diff --git a/drivers/staging/usbip/usbip_common.c b/drivers/staging/usbip/usbip_common.c
index 70f23026..95beb76 100644
--- a/drivers/staging/usbip/usbip_common.c
+++ b/drivers/staging/usbip/usbip_common.c
@@ -157,8 +157,7 @@ static void usbip_dump_usb_device(struct usb_device *udev)
dev_dbg(dev, "have_langid %d, string_langid %d\n",
udev->have_langid, udev->string_langid);
- dev_dbg(dev, "maxchild %d, children %p\n",
- udev->maxchild, udev->children);
+ dev_dbg(dev, "maxchild %d\n", udev->maxchild);
}
static void usbip_dump_request_type(__u8 rt)
diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c
index d956965..22cb9db 100644
--- a/drivers/usb/core/devices.c
+++ b/drivers/usb/core/devices.c
@@ -496,6 +496,7 @@ static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
char *pages_start, *data_end, *speed;
unsigned int length;
ssize_t total_written = 0;
+ struct usb_device *childdev = NULL;
/* don't bother with anything else if we're not writing any data */
if (*nbytes <= 0)
@@ -589,20 +590,20 @@ static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
free_pages((unsigned long)pages_start, 1);
/* Now look at all of this device's children. */
- for (chix = 0; chix < usbdev->maxchild; chix++) {
- struct usb_device *childdev = usbdev->children[chix];
-
+ usb_get_hub_each_child(usbdev, chix, childdev)
+ pr_info("%s: %d\n", __func__, chix);
if (childdev) {
usb_lock_device(childdev);
ret = usb_device_dump(buffer, nbytes, skip_bytes,
file_offset, childdev, bus,
- level + 1, chix, ++cnt);
+ level + 1, chix - 1, ++cnt);
usb_unlock_device(childdev);
+ usb_put_dev(childdev);
if (ret == -EFAULT)
return total_written;
total_written += ret;
}
- }
+
return total_written;
}
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 512f0d5..3f547f5 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -39,6 +39,7 @@
struct usb_hub_port {
void *port_owner;
+ struct usb_device *child;
};
struct usb_hub {
@@ -93,7 +94,7 @@ static inline int hub_is_superspeed(struct usb_device *hdev)
return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS);
}
-/* Protect struct usb_device->state and ->children members
+/* Protect struct usb_device->state and struct usb_hub_port->child 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. */
static DEFINE_SPINLOCK(device_state_lock);
@@ -871,8 +872,8 @@ static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
struct usb_device *hdev = hub->hdev;
int ret = 0;
- if (hdev->children[port1-1] && set_state)
- usb_set_device_state(hdev->children[port1-1],
+ if (hub->port_data[port1-1].child && set_state)
+ usb_set_device_state(hub->port_data[port1-1].child,
USB_STATE_NOTATTACHED);
if (!hub->error && !hub_is_superspeed(hub->hdev))
ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
@@ -1028,7 +1029,7 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
* which ports need attention.
*/
for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
- struct usb_device *udev = hdev->children[port1-1];
+ struct usb_device *udev = hub->port_data[port1-1].child;
u16 portstatus, portchange;
portstatus = portchange = 0;
@@ -1193,8 +1194,8 @@ static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
if (type != HUB_SUSPEND) {
/* Disconnect all the children */
for (i = 0; i < hdev->maxchild; ++i) {
- if (hdev->children[i])
- usb_disconnect(&hdev->children[i]);
+ if (hub->port_data[i].child)
+ usb_disconnect(&hub->port_data[i].child);
}
}
@@ -1273,11 +1274,9 @@ static int hub_configure(struct usb_hub *hub,
dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
(hdev->maxchild == 1) ? "" : "s");
- hdev->children = kzalloc(hdev->maxchild *
- sizeof(struct usb_device *), GFP_KERNEL);
hub->port_data = kzalloc(hdev->maxchild * sizeof(struct usb_hub_port),
GFP_KERNEL);
- if (!hub->port_data || !hdev->children) {
+ if (!hub->port_data) {
ret = -ENOMEM;
goto fail;
}
@@ -1509,7 +1508,6 @@ static unsigned highspeed_hubs;
static void hub_disconnect(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata(intf);
- struct usb_device *hdev = interface_to_usbdev(intf);
/* Take the hub off the event list and don't let it be added again */
spin_lock_irq(&hub_event_lock);
@@ -1531,7 +1529,6 @@ static void hub_disconnect(struct usb_interface *intf)
highspeed_hubs--;
usb_free_urb(hub->urb);
- kfree(hdev->children);
kfree(hub->port_data);
kfree(hub->descriptor);
kfree(hub->status);
@@ -1619,6 +1616,7 @@ static int
hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
{
struct usb_device *hdev = interface_to_usbdev (intf);
+ struct usb_hub *hub = usb_get_intfdata(intf);
/* assert ifno == 0 (part of hub spec) */
switch (code) {
@@ -1632,11 +1630,11 @@ hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
else {
info->nports = hdev->maxchild;
for (i = 0; i < info->nports; i++) {
- if (hdev->children[i] == NULL)
+ if (hub->port_data[i].child == NULL)
info->port[i] = 0;
else
info->port[i] =
- hdev->children[i]->devnum;
+ hub->port_data[i].child->devnum;
}
}
spin_unlock_irq(&device_state_lock);
@@ -1723,11 +1721,13 @@ bool usb_device_is_owned(struct usb_device *udev)
static void recursively_mark_NOTATTACHED(struct usb_device *udev)
{
+ struct usb_hub *hub = hdev_to_hub(udev);
int i;
for (i = 0; i < udev->maxchild; ++i) {
- if (udev->children[i])
- recursively_mark_NOTATTACHED(udev->children[i]);
+ if (hub->port_data[i].child)
+ recursively_mark_NOTATTACHED(
+ hub->port_data[i].child);
}
if (udev->state == USB_STATE_SUSPENDED)
udev->active_duration -= jiffies;
@@ -1891,6 +1891,7 @@ static void hub_free_dev(struct usb_device *udev)
void usb_disconnect(struct usb_device **pdev)
{
struct usb_device *udev = *pdev;
+ struct usb_hub *hub = hdev_to_hub(udev);
int i;
/* mark the device as inactive, so any further urb submissions for
@@ -1905,8 +1906,8 @@ void usb_disconnect(struct usb_device **pdev)
/* Free up all the children before we remove this device */
for (i = 0; i < udev->maxchild; i++) {
- if (udev->children[i])
- usb_disconnect(&udev->children[i]);
+ if (hub->port_data[i].child)
+ usb_disconnect(&hub->port_data[i].child);
}
/* deallocate hcd/hardware state ... nuking all pending urbs and
@@ -3003,7 +3004,7 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
for (port1 = 1; port1 <= hdev->maxchild; port1++) {
struct usb_device *udev;
- udev = hdev->children [port1-1];
+ udev = hub->port_data[port1-1].child;
if (udev && udev->can_submit) {
dev_warn(&intf->dev, "port %d nyet suspended\n", port1);
if (PMSG_IS_AUTO(msg))
@@ -3921,7 +3922,7 @@ hub_power_remaining (struct usb_hub *hub)
remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
- struct usb_device *udev = hdev->children[port1 - 1];
+ struct usb_device *udev = hub->port_data[port1 - 1].child;
int delta;
if (!udev)
@@ -3985,7 +3986,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
#endif
/* Try to resuscitate an existing device */
- udev = hdev->children[port1-1];
+ udev = hub->port_data[port1-1].child;
if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
udev->state != USB_STATE_NOTATTACHED) {
usb_lock_device(udev);
@@ -4014,7 +4015,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
/* Disconnect any existing devices under this port */
if (udev)
- usb_disconnect(&hdev->children[port1-1]);
+ usb_disconnect(&hub->port_data[port1-1].child);
clear_bit(port1, hub->change_bits);
/* We can forget about a "removed" device when there's a physical
@@ -4129,7 +4130,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
&& highspeed_hubs != 0)
check_highspeed (hub, udev, port1);
- /* Store the parent's children[] pointer. At this point
+ /* Store the hub port's child pointer. At this point
* udev becomes globally accessible, although presumably
* no one will look at it until hdev is unlocked.
*/
@@ -4143,7 +4144,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
if (hdev->state == USB_STATE_NOTATTACHED)
status = -ENOTCONN;
else
- hdev->children[port1-1] = udev;
+ hub->port_data[port1-1].child = udev;
spin_unlock_irq(&device_state_lock);
/* Run it through the hoops (find a driver, etc) */
@@ -4151,7 +4152,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
status = usb_new_device(udev);
if (status) {
spin_lock_irq(&device_state_lock);
- hdev->children[port1-1] = NULL;
+ hub->port_data[port1-1].child = NULL;
spin_unlock_irq(&device_state_lock);
}
}
@@ -4197,7 +4198,7 @@ static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
int ret;
hdev = hub->hdev;
- udev = hdev->children[port-1];
+ udev = hub->port_data[port - 1].child;
if (!hub_is_superspeed(hdev)) {
if (!(portchange & USB_PORT_STAT_C_SUSPEND))
return 0;
@@ -4351,7 +4352,7 @@ static void hub_events(void)
*/
if (!(portstatus & USB_PORT_STAT_ENABLE)
&& !connect_change
- && hdev->children[i-1]) {
+ && hub->port_data[i-1].child) {
dev_err (hub_dev,
"port %i "
"disabled by hub (EMI?), "
@@ -4904,3 +4905,31 @@ void usb_queue_reset_device(struct usb_interface *iface)
schedule_work(&iface->reset_ws);
}
EXPORT_SYMBOL_GPL(usb_queue_reset_device);
+
+/**
+ * usb_get_hub_child - Get the pointer of child device
+ * attached to the port which is specified by @port1.
+ * @hdev: USB device belonging to the usb hub
+ * @port1: port num to indicate which port the child device
+ * is attached to.
+ *
+ * USB drivers call this function to get hub's child device
+ * pointer. The child device's refcount will be increased
+ * before return. The caller should invoke usb_put_dev() to
+ * decrease the device's refcount when the child will not be
+ * used.
+ *
+ * Return NULL if input param is invalid and
+ * child's usb_device pointer if non-NULL.
+ */
+struct usb_device *usb_get_hub_child(struct usb_device *hdev,
+ int port1)
+{
+ struct usb_hub *hub = hdev_to_hub(hdev);
+
+ if (port1 < 1 || port1 > hdev->maxchild)
+ return NULL;
+ return usb_get_dev(hub->port_data[port1 - 1].child);
+}
+EXPORT_SYMBOL_GPL(usb_get_hub_child);
+
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index c868be6..96a752a 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -2033,18 +2033,18 @@ static int r8a66597_get_frame(struct usb_hcd *hcd)
static void collect_usb_address_map(struct usb_device *udev, unsigned long *map)
{
int chix;
+ struct usb_device *childdev;
if (udev->state == USB_STATE_CONFIGURED &&
udev->parent && udev->parent->devnum > 1 &&
udev->parent->descriptor.bDeviceClass == USB_CLASS_HUB)
map[udev->devnum/32] |= (1 << (udev->devnum % 32));
- for (chix = 0; chix < udev->maxchild; chix++) {
- struct usb_device *childdev = udev->children[chix];
-
- if (childdev)
+ usb_get_hub_each_child(udev, chix, childdev)
+ if (childdev) {
collect_usb_address_map(childdev, map);
- }
+ usb_put_dev(childdev);
+ }
}
/* this function must be called with interrupt disabled */
diff --git a/include/linux/usb.h b/include/linux/usb.h
index dea39dc..8883f5e 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -463,7 +463,6 @@ struct usb3_lpm_parameters {
* access from userspace
* @usbfs_dentry: usbfs dentry entry for the device
* @maxchild: number of ports if hub
- * @children: child devices - USB devices that are attached to this hub
* @quirks: quirks of the whole device
* @urbnum: number of URBs submitted for the whole device
* @active_duration: total time device is not suspended
@@ -537,7 +536,6 @@ struct usb_device {
struct list_head filelist;
int maxchild;
- struct usb_device **children;
u32 quirks;
atomic_t urbnum;
@@ -567,6 +565,21 @@ static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf)
extern struct usb_device *usb_get_dev(struct usb_device *dev);
extern void usb_put_dev(struct usb_device *dev);
+extern struct usb_device *usb_get_hub_child(struct usb_device *hdev,
+ int port1);
+
+/**
+ * usb_get_hub_each_child - iterate over all child devices on the hub
+ * @hdev: USB device belonging to the usb hub
+ * @port1: portnum associated with child device
+ * @child: child device pointer
+ *
+ * NOTE: usb_get_hub_child() increases the child device's refcount.
+ */
+#define usb_get_hub_each_child(hdev, port1, child) \
+ for (port1 = 1, child = usb_get_hub_child(hdev, port1); \
+ port1 <= hdev->maxchild; \
+ child = usb_get_hub_child(hdev, ++port1))
/* USB device locking */
#define usb_lock_device(udev) device_lock(&(udev)->dev)
--
1.7.6.rc2.8.g28eb
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