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[PATCH] USB: Store port number in usb_device

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This patch (as610) adds a field to struct usb_device to store the device's
port number.  This allows us to remove several loops in the hub driver
(searching for a particular device among all the entries in the parent's
array of children).

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2005-11-23 12:09:52 -05:00 committed by Greg Kroah-Hartman
parent 55c527187c
commit 12c3da346e
3 changed files with 20 additions and 61 deletions
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67
drivers/usb/core/hub.c
View File

@ -946,24 +946,21 @@ static int locktree(struct usb_device *udev)
t = locktree(hdev);
if (t < 0)
return t;
for (t = 0; t < hdev->maxchild; t++) {
if (hdev->children[t] == udev) {
/* everything is fail-fast once disconnect
* processing starts
*/
if (udev->state == USB_STATE_NOTATTACHED)
break;
if (udev->state == USB_STATE_NOTATTACHED) {
usb_unlock_device(hdev);
return -ENODEV;
}
/* when everyone grabs locks top->bottom,
* non-overlapping work may be concurrent
*/
usb_lock_device(udev);
usb_unlock_device(hdev);
return t + 1;
}
}
usb_unlock_device(hdev);
return -ENODEV;
return udev->portnum;
}
static void recursively_mark_NOTATTACHED(struct usb_device *udev)
@ -1335,15 +1332,9 @@ int usb_new_device(struct usb_device *udev)
le16_to_cpu(udev->config[0].desc.wTotalLength),
USB_DT_OTG, (void **) &desc) == 0) {
if (desc->bmAttributes & USB_OTG_HNP) {
unsigned port1;
unsigned port1 = udev->portnum;
struct usb_device *root = udev->parent;
for (port1 = 1; port1 <= root->maxchild;
port1++) {
if (root->children[port1-1] == udev)
break;
}
dev_info(&udev->dev,
"Dual-Role OTG device on %sHNP port\n",
(port1 == bus->otg_port)
@ -1720,22 +1711,9 @@ static int __usb_suspend_device (struct usb_device *udev, int port1)
int usb_suspend_device(struct usb_device *udev)
{
#ifdef CONFIG_USB_SUSPEND
int port1;
if (udev->state == USB_STATE_NOTATTACHED)
return -ENODEV;
if (!udev->parent)
port1 = 0;
else {
for (port1 = udev->parent->maxchild; port1 > 0; --port1) {
if (udev->parent->children[port1-1] == udev)
break;
}
if (port1 == 0)
return -ENODEV;
}
return __usb_suspend_device(udev, port1);
return __usb_suspend_device(udev, udev->portnum);
#else
/* NOTE: udev->state unchanged, it's not lying ... */
udev->dev.power.power_state = PMSG_SUSPEND;
@ -1893,20 +1871,10 @@ hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
*/
int usb_resume_device(struct usb_device *udev)
{
int port1, status;
int status;
if (udev->state == USB_STATE_NOTATTACHED)
return -ENODEV;
if (!udev->parent)
port1 = 0;
else {
for (port1 = udev->parent->maxchild; port1 > 0; --port1) {
if (udev->parent->children[port1-1] == udev)
break;
}
if (port1 == 0)
return -ENODEV;
}
#ifdef CONFIG_USB_SUSPEND
/* selective resume of one downstream hub-to-device port */
@ -1915,7 +1883,7 @@ int usb_resume_device(struct usb_device *udev)
// NOTE swsusp may bork us, device state being wrong...
// NOTE this fails if parent is also suspended...
status = hub_port_resume(hdev_to_hub(udev->parent),
port1, udev);
udev->portnum, udev);
} else
status = 0;
} else
@ -3029,7 +2997,8 @@ int usb_reset_device(struct usb_device *udev)
struct usb_hub *parent_hub;
struct usb_device_descriptor descriptor = udev->descriptor;
struct usb_hub *hub = NULL;
int i, ret = 0, port1 = -1;
int i, ret = 0;
int port1 = udev->portnum;
if (udev->state == USB_STATE_NOTATTACHED ||
udev->state == USB_STATE_SUSPENDED) {
@ -3043,18 +3012,6 @@ int usb_reset_device(struct usb_device *udev)
dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
return -EISDIR;
}
for (i = 0; i < parent_hdev->maxchild; i++)
if (parent_hdev->children[i] == udev) {
port1 = i + 1;
break;
}
if (port1 < 0) {
/* If this ever happens, it's very bad */
dev_err(&udev->dev, "Can't locate device's port!\n");
return -ENOENT;
}
parent_hub = hdev_to_hub(parent_hdev);
/* If we're resetting an active hub, take some special actions */

1
drivers/usb/core/usb.c
View File

@ -439,6 +439,7 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1)
/* hub driver sets up TT records */
}
dev->portnum = port1;
dev->bus = bus;
dev->parent = parent;
INIT_LIST_HEAD(&dev->filelist);

1
include/linux/usb.h
View File

@ -348,6 +348,7 @@ struct usb_device {
char **rawdescriptors; /* Raw descriptors for each config */
unsigned short bus_mA; /* Current available from the bus */
u8 portnum; /* Parent port number (origin 1) */
int have_langid; /* whether string_langid is valid */
int string_langid; /* language ID for strings */