From: Christophe Lebouc <christophex.lebouc@intel.com>
Date: Thu, 30 Sep 2010 14:34:36 +0000 (+0100)
Subject: usb: langwell_udc: fix big file transfer issue.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c8458d59d424fcba2456d6cba5811ce01c3aedb9;p=linux-beck.git

usb: langwell_udc: fix big file transfer issue.

This patch fixing the problem with large file transfers failing. Swap the read
order to avoid unexpected RX status.

Signed-off-by: Christophe Lebouc <christophex.lebouc@intel.com>
Signed-off-by: Hao Wu <hao.wu@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
index d297f9eb92e4..064306046702 100644
--- a/drivers/usb/gadget/langwell_udc.c
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -2440,12 +2440,14 @@ 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) {