The scheduling code in ehci-hcd contains an error. For full-speed isochronous-OUT transfers, the EHCI spec forbids scheduling Start-Split transactions in H-microframe 7, but the driver allows it anyway. This patch adds a check to prevent it. Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> --- [as1717] drivers/usb/host/ehci-sched.c | 4 ++++ 1 file changed, 4 insertions(+) Index: usb-3.11/drivers/usb/host/ehci-sched.c =================================================================== --- usb-3.11.orig/drivers/usb/host/ehci-sched.c +++ usb-3.11/drivers/usb/host/ehci-sched.c @@ -1286,6 +1286,10 @@ sitd_slot_ok ( mask = stream->raw_mask << (uframe & 7); + /* for OUT, don't wrap SSPLIT into H-microframe 7 */ + if (((stream->raw_mask & 0xff) << (uframe & 7)) >= (1 << 7)) + return 0; + /* for IN, don't wrap CSPLIT into the next frame */ if (mask & ~0xffff) return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
