From: Alan Stern <stern@rowland.harvard.edu>
Date: Fri, 11 Oct 2013 15:28:12 +0000 (-0400)
Subject: USB: EHCI: check the right uframes for CSPLIT
X-Git-Tag: v3.13-rc1~174^2~75
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e24371a6be9c5c00b56607bd425cc409cba75d88;p=kernel%2Fkernel-generic.git

USB: EHCI: check the right uframes for CSPLIT

The check_intr_schedule() routine in ehci-hcd looks at the wrong
microframes when checking to see if a full-speed or low-speed
interrupt endpoint will fit in the periodic schedule.  If the
Start-Split transaction is scheduled for microframe N then the
Complete-Split transactions get scheduled for microframes N+2, N+3, and
N+4.  However the code considers N+1, N+2, and N+3 instead.

This patch fixes the limits on the "for" loop and also improves the
use of whitespace.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index dcbaad9..34b5945 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -761,7 +761,7 @@ static int check_intr_schedule (
 		unsigned i;
 
 		/* TODO : this may need FSTN for SSPLIT in uframe 5. */
-		for (i=uframe+1; i<8 && i<uframe+4; i++)
+		for (i = uframe+2; i < 8 && i <= uframe+4; i++)
 			if (!check_period (ehci, frame, i,
 						qh->period, qh->c_usecs))
 				goto done;