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USB: EHCI: No SSPLIT allowed in uframe 7

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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@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2013-10-11 11:28:31 -04:00 committed by Greg Kroah-Hartman
parent 2b90f01b21
commit 8c05dc598e
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/host/ehci-sched.c
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@ -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;