usbfs: Increase arbitrary limit for USB 3 isopkt length

Increase the current arbitrary limit for isocronous packet size to a
value large enough to account for USB 3.0 super bandwidth streams,
bMaxBurst (0~15 allowed, 1~16 packets)
bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
so the size max for one USB 3 isocronous transfer is
1024 byte * 16 * 3 = 49152 byte

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Federico Manzan <f.manzan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index caefc800f2986defa9f66973d071fc7140d632d4..c88c4fb9459dfbc94119e8a0590a924fa5868f0c 100644 (file)
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1287,9 +1287,13 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
                        goto error;
                }
                for (totlen = u = 0; u < uurb->number_of_packets; u++) {
-                       /* arbitrary limit,
-                        * sufficient for USB 2.0 high-bandwidth iso */
-                       if (isopkt[u].length > 8192) {
+                       /*
+                        * arbitrary limit need for USB 3.0
+                        * bMaxBurst (0~15 allowed, 1~16 packets)
+                        * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
+                        * sizemax: 1024 * 16 * 3 = 49152
+                        */
+                       if (isopkt[u].length > 49152) {
                                ret = -EINVAL;
                                goto error;
                        }