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usb: hub: add check for unsupported bus topology

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We can't allow hubs on the 7th tier as they would allow
devices on the 8th tier.

Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Felipe Balbi 2008-06-12 10:49:47 +03:00 committed by Greg Kroah-Hartman
parent 6deb270b5c
commit 38f3ad5e74
3 changed files with 8 additions and 2 deletions
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2
drivers/usb/core/devices.c
View File

@ -61,8 +61,6 @@
#include "usb.h"
#include "hcd.h"
#define MAX_TOPO_LEVEL 6
/* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */
#define ALLOW_SERIAL_NUMBER

2
drivers/usb/core/hcd.h
View File

@ -21,6 +21,8 @@
#include <linux/rwsem.h>
#define MAX_TOPO_LEVEL 6
/* This file contains declarations of usbcore internals that are mostly
* used or exposed by Host Controller Drivers.
*/

6
drivers/usb/core/hub.c
View File

@ -1051,6 +1051,12 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
desc = intf->cur_altsetting;
hdev = interface_to_usbdev(intf);
if (hdev->level == MAX_TOPO_LEVEL) {
dev_err(&intf->dev, "Unsupported bus topology: "
"hub nested too deep\n");
return -E2BIG;
}
#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
if (hdev->parent) {
dev_warn(&intf->dev, "ignoring external hub\n");