[Meego-kernel] [PATCH v2 10/10] usb: langwell_udc: fix big file transfer issue

[Wu, Hao]

>From f63205a8399151353cf3b5ea78c6fc4676cb441f Mon Sep 17 00:00:00 2001
From: Hao Wu <hao.wu at intel.com>
Date: Wed, 29 Sep 2010 00:08:36 +0800
Subject: [PATCH] usb: langwell_udc: fix big file transfer issue.

This patch is for big file transfer issue fixing. Swap read order
to avoid unexpected RX status.

Signed-off-by: Christophe Lebouc <christophex.lebouc at intel.com>
Signed-off-by: Hao Wu <hao.wu at intel.com>
---
 drivers/usb/gadget/langwell_udc.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
index 40784e8..df297c1 100644
--- a/drivers/usb/gadget/langwell_udc.c
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -2465,12 +2465,14 @@ static int process_ep_req(struct langwell_udc *dev, int index,
 	dev_vdbg(&dev->pdev->dev, "---> %s()\n", __func__);
 
 	for (i = 0; i < curr_req->dtd_count; i++) {
-		remaining_length = le16_to_cpu(curr_dtd->dtd_total);
-		actual -= remaining_length;
 
 		/* command execution states by dTD */
 		dtd_status = curr_dtd->dtd_status;
 
+		barrier();
+		remaining_length = le16_to_cpu(curr_dtd->dtd_total);
+		actual -= remaining_length;
+
 		if (!dtd_status) {
 			/* transfers completed successfully */
 			if (!remaining_length) {
-- 
1.5.5

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