When the EHCI driver falls behind in its scheduling, the active stream's
first empty microframe may be in the past with respect to the current
microframe. The code attempts to move the starting microframe ("start") N
number of microframes forward, where N is the interval of endpoint.
However, stream->interval is a copy of the endpoint's bInterval, which is
designated in frames for FS devices, and microframes for HS devices.
Convert stream->interval to microframes before using it to move the
starting microframe forward.
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
CC: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
---
drivers/usb/host/ehci-sched.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index b1dbdf9..d163371 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -1349,6 +1349,10 @@ iso_stream_schedule (
goto fail;
}
+ period = urb->interval;
+ if (!stream->highspeed)
+ period <<= 3;
+
now = ehci_readl(ehci, &ehci->regs->frame_index) % mod;
/* when's the last uframe this urb could start? */
@@ -1366,8 +1370,8 @@ iso_stream_schedule (
/* Fell behind (by up to twice the slop amount)? */
if (start >= max - 2 * 8 * SCHEDULE_SLOP)
- start += stream->interval * DIV_ROUND_UP(
- max - start, stream->interval) - mod;
+ start += period * DIV_ROUND_UP(
+ max - start, period) - mod;
/* Tried to schedule too far into the future? */
if (unlikely((start + sched->span) >= max)) {
@@ -1390,10 +1394,6 @@ iso_stream_schedule (
/* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
- period = urb->interval;
- if (!stream->highspeed)
- period <<= 3;
-
/* find a uframe slot with enough bandwidth */
for (; start < (stream->next_uframe + period); start++) {
int enough_space;
--
1.5.6.5
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
