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Commit 2b90f01b authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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USB: EHCI: compute full-speed bandwidth usage correctly 



Although the bandwidth statistics maintained by ehci-hcd show up only
in the /sys/kernel/debug/usb/devices file, they ought to be calculated
correctly.  The calculation for full-speed isochronous endpoints is
wrong; it mistakenly yields bytes per microframe instead of bytes per
frame.  The "interval" value, which is in frames, should not be
converted to microframes.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e24371a6

drivers/usb/host/ehci-sched.c

+1 −1
Original line number Diff line number Diff line
@@ -1055,7 +1055,7 @@ iso_stream_init ( 
		} else

			stream->raw_mask = smask_out [hs_transfers - 1];

		bandwidth = stream->usecs + stream->c_usecs;

		bandwidth /= interval << 3;

		bandwidth /= interval;



		/* stream->splits gets created from raw_mask later */

		stream->address = cpu_to_hc32(ehci, addr);