From: Alan Stern Date: Fri, 11 Oct 2013 15:28:31 +0000 (-0400) Subject: USB: EHCI: No SSPLIT allowed in uframe 7 X-Git-Tag: firefly_0821_release~176^2~5061^2~73 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8c05dc598e5bc0eb33791de23157cf1e47cb580e;p=firefly-linux-kernel-4.4.55.git 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 --- diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index 4b0903c6c616..1fc2befc4fdc 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;