update

[l4.git] / l4 / pkg / linux-26-headers / include / linux / usb / ch11.h

diff --git a/l4/pkg/linux-26-headers/include/linux/usb/ch11.h b/l4/pkg/linux-26-headers/include/linux/usb/ch11.h
index 7692dc69ccf7aeeb16ebc682b57d519c56642ba1..331499d597fa86cd941d99d5ad8ab9ec2120cb86 100644 (file)
--- a/l4/pkg/linux-26-headers/include/linux/usb/ch11.h
+++ b/l4/pkg/linux-26-headers/include/linux/usb/ch11.h
@@ -11,6 +11,17 @@
 
 #include <linux/types.h>       /* __u8 etc */
 
+/* This is arbitrary.
+ * From USB 2.0 spec Table 11-13, offset 7, a hub can
+ * have up to 255 ports. The most yet reported is 10.
+ *
+ * Current Wireless USB host hardware (Intel i1480 for example) allows
+ * up to 22 devices to connect. Upcoming hardware might raise that
+ * limit. Because the arrays need to add a bit for hub status data, we
+ * use 31, so plus one evens out to four bytes.
+ */
+#define USB_MAXCHILDREN                31
+
 /*
  * Hub request types
  */