From: Christophe Lebouc <christophex.lebouc@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Hao Wu <hao.wu@xxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---
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 d297f9e..0643060 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) {
--
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