From 8c05dc598e5bc0eb33791de23157cf1e47cb580e Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Fri, 11 Oct 2013 11:28:31 -0400 Subject: [PATCH] USB: EHCI: No SSPLIT allowed in uframe 7 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-sched.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index 4b0903c..1fc2bef 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/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; -- 2.7.4