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_device()
to get child's pointer.
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/staging/usbip/usbip_common.c | 2 +-
drivers/usb/core/devices.c | 3 +-
drivers/usb/core/hub.c | 75 +++++++++++++++++++++-------------
drivers/usb/host/r8a66597-hcd.c | 3 +-
include/linux/usb.h | 4 +-
5 files changed, 54 insertions(+), 33 deletions(-)
diff --git a/drivers/staging/usbip/usbip_common.c b/drivers/staging/usbip/usbip_common.c
index d93e7f1..d1ba001 100644
--- a/drivers/staging/usbip/usbip_common.c
+++ b/drivers/staging/usbip/usbip_common.c
@@ -158,7 +158,7 @@ static void usbip_dump_usb_device(struct usb_device *udev)
udev->have_langid, udev->string_langid);
dev_dbg(dev, "maxchild %d, children %p\n",
- udev->maxchild, udev->children);
+ udev->maxchild, usb_get_hub_child_device(udev, udev->devnum));
}
static void usbip_dump_request_type(__u8 rt)
diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c
index d956965..a83962b 100644
--- a/drivers/usb/core/devices.c
+++ b/drivers/usb/core/devices.c
@@ -590,7 +590,8 @@ static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
/* Now look at all of this device's children. */
for (chix = 0; chix < usbdev->maxchild; chix++) {
- struct usb_device *childdev = usbdev->children[chix];
+ struct usb_device *childdev =
+ usb_get_hub_child_device(usbdev, chix + 1);
if (childdev) {
usb_lock_device(childdev);
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 3c82bb7..2721be4 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 {
@@ -91,7 +92,7 @@ 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);
@@ -174,7 +175,7 @@ static inline char *portspeed(struct usb_hub *hub, int portstatus)
/* Note that hdev or one of its children must be locked! */
static struct usb_hub *hdev_to_hub(struct usb_device *hdev)
{
- if (!hdev || !hdev->actconfig)
+ if (!hdev || !hdev->actconfig || !hdev->maxchild)
return NULL;
return usb_get_intfdata(hdev->actconfig->interface[0]);
}
@@ -624,8 +625,8 @@ 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);
@@ -781,7 +782,7 @@ 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;
@@ -945,8 +946,8 @@ 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);
}
}
@@ -1373,6 +1374,7 @@ 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) {
@@ -1386,11 +1388,11 @@ 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);
@@ -1477,12 +1479,15 @@ 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)
+ for (i = 0; i < udev->maxchild; ++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;
udev->state = USB_STATE_NOTATTACHED;
@@ -1647,6 +1652,7 @@ void usb_disconnect(struct usb_device **pdev)
struct usb_device *udev = *pdev;
int i;
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+ struct usb_hub *hub = hdev_to_hub(udev);
/* mark the device as inactive, so any further urb submissions for
* this device (and any of its children) will fail immediately.
@@ -1659,10 +1665,11 @@ void usb_disconnect(struct usb_device **pdev)
usb_lock_device(udev);
/* Free up all the children before we remove this device */
- for (i = 0; i < USB_MAXCHILDREN; i++) {
- if (udev->children[i])
- usb_disconnect(&udev->children[i]);
- }
+ if (hub)
+ for (i = 0; i < udev->maxchild; i++) {
+ if (hub->port_data[i].child)
+ usb_disconnect(&hub->port_data[i].child);
+ }
/* deallocate hcd/hardware state ... nuking all pending urbs and
* cleaning up all state associated with the current configuration
@@ -2727,7 +2734,7 @@ 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))
@@ -3201,7 +3208,7 @@ 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)
@@ -3265,7 +3272,7 @@ 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);
@@ -3294,7 +3301,7 @@ 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
@@ -3409,7 +3416,7 @@ 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.
*/
@@ -3423,7 +3430,7 @@ 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) */
@@ -3431,7 +3438,7 @@ 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);
}
}
@@ -3590,7 +3597,7 @@ 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?), "
@@ -3605,14 +3612,14 @@ static void hub_events(void)
clear_port_feature(hdev, i,
USB_PORT_FEAT_C_SUSPEND);
- udev = hdev->children[i-1];
+ udev = hub->port_data[i-1].child;
if (udev) {
/* TRSMRCY = 10 msec */
msleep(10);
usb_lock_device(udev);
- ret = usb_remote_wakeup(hdev->
- children[i-1]);
+ ret = usb_remote_wakeup(hub->
+ port_data[i-1].child);
usb_unlock_device(udev);
if (ret < 0)
connect_change = 1;
@@ -4149,3 +4156,15 @@ void usb_queue_reset_device(struct usb_interface *iface)
schedule_work(&iface->reset_ws);
}
EXPORT_SYMBOL_GPL(usb_queue_reset_device);
+
+struct usb_device *usb_get_hub_child_device(struct usb_device *hdev,
+ int port1)
+{
+ struct usb_hub *hub = hdev_to_hub(hdev);
+
+ if (!hub || port1 > hdev->maxchild || port1 < 1)
+ return NULL;
+ return hub->port_data[port1 - 1].child;
+}
+EXPORT_SYMBOL_GPL(usb_get_hub_child_device);
+
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index e84ca19..2a50550 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -2040,7 +2040,8 @@ static void collect_usb_address_map(struct usb_device *udev, unsigned long *map)
map[udev->devnum/32] |= (1 << (udev->devnum % 32));
for (chix = 0; chix < udev->maxchild; chix++) {
- struct usb_device *childdev = udev->children[chix];
+ struct usb_device *childdev =
+ usb_get_hub_child_device(udev, chix + 1);
if (childdev)
collect_usb_address_map(childdev, map);
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 0c51663..5e7058d 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -428,7 +428,6 @@ enum usb_device_removable {
* 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
@@ -501,7 +500,6 @@ struct usb_device {
#endif
int maxchild;
- struct usb_device *children[USB_MAXCHILDREN];
u32 quirks;
atomic_t urbnum;
@@ -527,6 +525,8 @@ 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_device(struct usb_device *hdev,
+ int port1);
/* USB device locking */
#define usb_lock_device(udev) device_lock(&(udev)->dev)
--
1.7.6.rc2.8.g28eb
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
