diff options
author | Lan Tianyu <tianyu.lan@intel.com> | 2012-09-05 05:44:32 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-09-10 19:59:42 (GMT) |
commit | ff823c79a5c33194c2e5594f7c4686ea3547910c (patch) | |
tree | 0685b5aee627d7f3440dc09865a7715406cfee54 /drivers/usb/core/hub.c | |
parent | fa2a9566257a3b62c328ea5d621ccf5952079dac (diff) | |
download | linux-fsl-qoriq-ff823c79a5c33194c2e5594f7c4686ea3547910c.tar.xz |
usb: move children to struct usb_port
The usb_device structure contains an array of usb_device "children".
This array is only valid if the usb_device is a hub, so it makes no
sense to store it there. Instead, store the usb_device child
in its parent usb_port structure.
Since usb_port is an internal USB core structure, add a new function to
get the USB device child, usb_hub_find_child(). Add a new macro,
usb_hub_get_each_child(), to iterate over all the children attached to a
particular USB hub.
Remove the printing the USB children array pointer from the usb-ip
driver, since it's really not necessary.
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/hub.c')
-rw-r--r-- | drivers/usb/core/hub.c | 73 |
1 files changed, 49 insertions, 24 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 87df22e..cdbade1 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -40,6 +40,7 @@ #endif struct usb_port { + struct usb_device *child; struct device dev; struct dev_state *port_owner; }; @@ -181,7 +182,7 @@ 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]); } @@ -876,8 +877,8 @@ 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->ports[port1 - 1]->child && set_state) + usb_set_device_state(hub->ports[port1 - 1]->child, USB_STATE_NOTATTACHED); if (!hub->error && !hub_is_superspeed(hub->hdev)) ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); @@ -1033,7 +1034,7 @@ 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->ports[port1 - 1]->child; u16 portstatus, portchange; portstatus = portchange = 0; @@ -1198,8 +1199,8 @@ 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->ports[i]->child) + usb_disconnect(&hub->ports[i]->child); } } @@ -1324,11 +1325,9 @@ 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->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), GFP_KERNEL); - if (!hdev->children || !hub->ports) { + if (!hub->ports) { ret = -ENOMEM; goto fail; } @@ -1591,7 +1590,6 @@ static void hub_disconnect(struct usb_interface *intf) highspeed_hubs--; usb_free_urb(hub->urb); - kfree(hdev->children); kfree(hub->ports); kfree(hub->descriptor); kfree(hub->status); @@ -1679,6 +1677,7 @@ 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 = hdev_to_hub(hdev); /* assert ifno == 0 (part of hub spec) */ switch (code) { @@ -1692,11 +1691,11 @@ 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->ports[i]->child == NULL) info->port[i] = 0; else info->port[i] = - hdev->children[i]->devnum; + hub->ports[i]->child->devnum; } } spin_unlock_irq(&device_state_lock); @@ -1784,11 +1783,12 @@ 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->ports[i]->child) + recursively_mark_NOTATTACHED(hub->ports[i]->child); } if (udev->state == USB_STATE_SUSPENDED) udev->active_duration -= jiffies; @@ -1952,6 +1952,7 @@ 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 @@ -1966,8 +1967,8 @@ 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->ports[i]->child) + usb_disconnect(&hub->ports[i]->child); } /* deallocate hcd/hardware state ... nuking all pending urbs and @@ -3131,7 +3132,7 @@ 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->ports[port1 - 1]->child; if (udev && udev->can_submit) { dev_warn(&intf->dev, "port %d nyet suspended\n", port1); if (PMSG_IS_AUTO(msg)) @@ -4058,7 +4059,7 @@ 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->ports[port1 - 1]->child; int delta; if (!udev) @@ -4122,7 +4123,7 @@ 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->ports[port1 - 1]->child; if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && udev->state != USB_STATE_NOTATTACHED) { usb_lock_device(udev); @@ -4151,7 +4152,7 @@ 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->ports[port1 - 1]->child); clear_bit(port1, hub->change_bits); /* We can forget about a "removed" device when there's a physical @@ -4287,7 +4288,7 @@ 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->ports[port1 - 1]->child = udev; spin_unlock_irq(&device_state_lock); /* Run it through the hoops (find a driver, etc) */ @@ -4295,7 +4296,7 @@ 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->ports[port1 - 1]->child = NULL; spin_unlock_irq(&device_state_lock); } } @@ -4341,7 +4342,7 @@ 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->ports[port - 1]->child; if (!hub_is_superspeed(hdev)) { if (!(portchange & USB_PORT_STAT_C_SUSPEND)) return 0; @@ -4495,7 +4496,7 @@ static void hub_events(void) */ if (!(portstatus & USB_PORT_STAT_ENABLE) && !connect_change - && hdev->children[i-1]) { + && hub->ports[i - 1]->child) { dev_err (hub_dev, "port %i " "disabled by hub (EMI?), " @@ -5052,3 +5053,27 @@ void usb_queue_reset_device(struct usb_interface *iface) schedule_work(&iface->reset_ws); } EXPORT_SYMBOL_GPL(usb_queue_reset_device); + +/** + * usb_hub_find_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. + * + * Return NULL if input param is invalid and + * child's usb_device pointer if non-NULL. + */ +struct usb_device *usb_hub_find_child(struct usb_device *hdev, + int port1) +{ + struct usb_hub *hub = hdev_to_hub(hdev); + + if (port1 < 1 || port1 > hdev->maxchild) + return NULL; + return hub->ports[port1 - 1]->child; +} +EXPORT_SYMBOL_GPL(usb_hub_find_child); |