The current EHCI TT scheduler checks any periodic transfers greater than 1
uframe to make sure each of its fully-used uframes is empty, but there is a bug
that causes it to not check the last fully-used uframe. This patch removes the
unneeded -1 to fix that bug, so the scheduler does check each fully-used uframe
to verify that it is empty before scheduling the transfer.
Signed-off-by: Dan Streetman <ddstreet@xxxxxxxx>
Reported-by: Kung James <kong1191@xxxxxxxxx>
--- a/drivers/usb/host/ehci-sched.c 2009-04-17 15:05:02.000000000 -0400
+++ linux-2.6.30-rc2/drivers/usb/host/ehci-sched.c 2009-04-17 15:05:33.000000000 -0400
@@ -323,7 +323,7 @@ static int tt_available (
* already scheduled transactions
*/
if (125 < usecs) {
- int ufs = (usecs / 125) - 1;
+ int ufs = (usecs / 125);
int i;
for (i = uframe; i < (uframe + ufs) && i < 8; i++)
if (0 < tt_usecs[i]) {
--
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