linux-kernel - [PATCH 4.9 037/109] dmaengine: stm32-dma: Set correct args number for DMA request from DT

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Date:   Thu,  7 Dec 2017 13:56:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mboumba Cedric Madianga <cedric.madianga@...il.com>,
        Ludovic BARRE <ludovic.barre@...com>,
        Vinod Koul <vinod.koul@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 037/109] dmaengine: stm32-dma: Set correct args number for DMA request from DT

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

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

From: M'boumba Cedric Madianga <cedric.madianga@...il.com>


[ Upstream commit 7e96304d99477de1f70db42035071e56439da817 ]

This patch sets the right number of arguments to be used for DMA clients
which request channels from DT.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@...il.com>
Reviewed-by: Ludovic BARRE <ludovic.barre@...com>
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dma/stm32-dma.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -976,21 +976,18 @@ static struct dma_chan *stm32_dma_of_xla
 	struct stm32_dma_chan *chan;
 	struct dma_chan *c;
 
-	if (dma_spec->args_count < 3)
+	if (dma_spec->args_count < 4)
 		return NULL;
 
 	cfg.channel_id = dma_spec->args[0];
 	cfg.request_line = dma_spec->args[1];
 	cfg.stream_config = dma_spec->args[2];
-	cfg.threshold = 0;
+	cfg.threshold = dma_spec->args[3];
 
 	if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) || (cfg.request_line >=
 				STM32_DMA_MAX_REQUEST_ID))
 		return NULL;
 
-	if (dma_spec->args_count > 3)
-		cfg.threshold = dma_spec->args[3];
-
 	chan = &dmadev->chan[cfg.channel_id];
 
 	c = dma_get_slave_channel(&chan->vchan.chan);