linux-kernel - [PATCH 4.4 11/93] usb: musb: Fix DMA desired mode for Mentor DMA engine

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Date:   Thu,  6 Oct 2016 10:28:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Cristian Birsan <cristian.birsan@...rochip.com>,
        Joshua Henderson <joshua.henderson@...rochip.com>,
        Felipe Balbi <balbi@...nel.org>,
        Adam Ford <aford173@...il.com>,
        Tony Lindgren <tony@...mide.com>
Subject: [PATCH 4.4 11/93] usb: musb: Fix DMA desired mode for Mentor DMA engine

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Cristian Birsan <cristian.birsan@...rochip.com>

commit bba40e6948b94cba71965285fbac31bd078c024a upstream.

Commit 754fe4a92c07 ("usb: musb: Remove ifdefs for TX DMA for musb_host.c")
introduces a problem setting the desired channel mode for the Mentor DMA
engine.

There is a case where an address is incorrectly assigned to the DMA
channel desired mode when it should instead be assigned the actual mode
value. This results in the value of channel->desired_mode not being
correct.

Acked-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Signed-off-by: Cristian Birsan <cristian.birsan@...rochip.com>
Signed-off-by: Joshua Henderson <joshua.henderson@...rochip.com>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Cc: Adam Ford <aford173@...il.com>
Cc: Tony Lindgren <tony@...mide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/musb/musb_host.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -661,7 +661,7 @@ static int musb_tx_dma_set_mode_mentor(s
 		csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
 		csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
 	}
-	channel->desired_mode = mode;
+	channel->desired_mode = *mode;
 	musb_writew(epio, MUSB_TXCSR, csr);
 
 	return 0;