[PATCH 2/2] usb ehci: fix audio record functionality for some Full speed sound blaster devices

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From: Dmitri Epshtein <dima@xxxxxxxxxxx>

This patch fix audio record functionality for some Full speed sound blaster devices.
Issue: Sometimes transaction complete indication is coming from HW one frame later.
Solution: If scan_periodic process now frame or previous frame now-1 and sitd transaction
is not finished yet, exit scan_periodic function and check the same transaction in the next frame.

Signed-off-by: Dimitry Epshtein <dima@xxxxxxxxxxx>
Signed-off-by: Saeed Bishara <saeed@xxxxxxxxxxx>
---
 drivers/usb/host/ehci-sched.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 328f702..d87a846 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -2314,9 +2314,13 @@ restart:
 				 * No need to check for activity unless the
 				 * frame is current.
 				 */
-				if (frame == clock_frame && live &&
-						(q.sitd->hw_results &
-							SITD_ACTIVE(ehci))) {
+				if (((frame == clock_frame) ||
+				     (((frame + 1) % ehci->periodic_size)
+				      == clock_frame))
+				    && live
+				    && (q.sitd->hw_results &
+					SITD_ACTIVE(ehci))) {
+
 					incomplete = true;
 					q_p = &q.sitd->sitd_next;
 					hw_p = &q.sitd->hw_next;
-- 
1.6.0.4

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