linux-kernel - [PATCH v2 2/2] usb: musb: Fix DMA desired mode for Mentor DMA engine

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Message-ID: <1454969730-18480-2-git-send-email-joshua.henderson@microchip.com>
Date:	Mon, 8 Feb 2016 15:15:30 -0700
From:	Joshua Henderson <joshua.henderson@...rochip.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Cristian Birsan <cristian.birsan@...rochip.com>,
	Joshua Henderson <joshua.henderson@...rochip.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>
Subject: [PATCH v2 2/2] usb: musb: Fix DMA desired mode for Mentor DMA engine

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

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 the pointer of the channel DMA mode is incorrectly
assigned to an address, when it should be assigned the actual mode
value. This results in the value of channel->desired_mode not being
correct.

Signed-off-by: Cristian Birsan <cristian.birsan@...rochip.com>
Signed-off-by: Joshua Henderson <joshua.henderson@...rochip.com>
---
Changes since v1:
	- Fix commit comment citing the cause of the regression.
---
 drivers/usb/musb/musb_host.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 6bef86f..b9e24862 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -662,7 +662,7 @@ static int musb_tx_dma_set_mode_mentor(struct dma_controller *dma,
 		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;
-- 
1.7.9.5