linux-kernel - [PATCH 3.16 026/346] usb: renesas_usbhs: fix the sequence in xfer

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Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Yoshihiro Shimoda" <yoshihiro.shimoda.uh@...esas.com>,
        "Felipe Balbi" <balbi@...com>
Subject: [PATCH 3.16 026/346] usb: renesas_usbhs: fix the sequence in
 xfer_work()

3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit 9b53d9af7aac09cf249d72bfbf15f08e47c4f7fe upstream.

This patch fixes the setup sequence in xfer_work(). Otherwise,
sometimes a usb transaction will get stuck.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Signed-off-by: Felipe Balbi <balbi@...com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/renesas_usbhs/fifo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -806,10 +806,10 @@ static void xfer_work(struct work_struct
 	dev_dbg(dev, "  %s %d (%d/ %d)\n",
 		fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 
-	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
-	usbhs_pipe_enable(pipe);
 	usbhsf_dma_start(pipe, fifo);
+	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
 	dma_async_issue_pending(chan);
+	usbhs_pipe_enable(pipe);
 }
 
 /*