summaryrefslogtreecommitdiffstats
path: root/drivers/usb/core
diff options
context:
space:
mode:
authorSarah Sharp <sarah.a.sharp@linux.intel.com>2009-09-04 10:53:17 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 06:46:40 -0700
commit4a0cd9670f22c308bc5936ee9734d8ee3f1baa52 (patch)
treef03257a5882a68b5eaae42189d5c1c401c37b57a /drivers/usb/core
parenta50c8aa953c65fd690eca03a2618ac445a3da05d (diff)
USB: xhci: Set route string for all devices.
The xHCI driver needs to set the route string in the slot context of all devices, not just SuperSpeed devices. The route string concept was added in the USB 3.0 specification, section 10.1.3.2. Each hub in the topology is expected to have no more than 15 ports in order for the route string of a device to be unique. SuperSpeed hubs are restricted to only having 15 ports, but FS/LS/HS hubs are not. The xHCI specification says that if the port number the device is under is greater than 15, that portion of the route string shall be set to 15. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/usb.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 30dd2636f26..b1b85abb9a2 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -413,8 +413,13 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
} else {
snprintf(dev->devpath, sizeof dev->devpath,
"%s.%d", parent->devpath, port1);
- dev->route = parent->route +
- (port1 << ((parent->level - 1)*4));
+ /* Route string assumes hubs have less than 16 ports */
+ if (port1 < 15)
+ dev->route = parent->route +
+ (port1 << ((parent->level - 1)*4));
+ else
+ dev->route = parent->route +
+ (15 << ((parent->level - 1)*4));
}
dev->dev.parent = &parent->dev;