Commit e2e2f0ea authored May 24, 2013 by Federico Manzan Committed by Greg Kroah-Hartman May 29, 2013

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>

parent 5cbfa3ac

drivers/usb/core/devio.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -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;
		}

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