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 <st...@rowland.harvard.edu>
---
[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;
--
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