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27 March 2024, 02:37:15 UTC
Revision 1b9a38bfa6e664ff02511314f5586d711c83cc91 authored by Alan Stern on 08 January 2010, 16:17:55 UTC, committed by Greg Kroah-Hartman on 20 January 2010, 23:24:34 UTC 
USB: EHCI: fix handling of unusual interrupt intervals
 
This patch (as1320) fixes two problems related to interrupt-URB
scheduling in ehci-hcd.

	URBs with an interval of 2 or 4 microframes aren't handled.
	For the time being, the patch reduces to interval to 1 uframe.

	URBs are constrained to have an interval no larger than 1024
	frames by usb_submit_urb().  But some EHCI controllers allow
	use of a schedule as short as 256 frames; for these
	controllers we may have to decrease the interval to the
	actual schedule length.

The second problem isn't very significant since few devices expose
interrupt endpoints with an interval larger than 256 frames.  But the
first problem is critical; it will prevent the kernel from working
with devices having interrupt intervals of 2 or 4 uframes.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Tested-by: Glynn Farrow <farrowg@sg.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 parent acbe2fe
History
Tip revision: 1b9a38bfa6e664ff02511314f5586d711c83cc91 authored by Alan Stern on 08 January 2010, 16:17:55 UTC
USB: EHCI: fix handling of unusual interrupt intervals
Tip revision: 1b9a38b
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