linux-kernel - [PATCH] dmaengine: tegra: Fix uninitialized variable usage

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Date:   Wed, 20 Apr 2022 18:52:39 +0530
From:   Akhil R <akhilrajeev@...dia.com>
To:     <devicetree@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <jonathanh@...dia.com>, <kyarlagadda@...dia.com>,
        <ldewangan@...dia.com>, <linux-kernel@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <p.zabel@...gutronix.de>,
        <rgumasta@...dia.com>, <robh+dt@...nel.org>,
        <thierry.reding@...il.com>, <nathan@...nel.org>,
        <vkoul@...nel.org>, <dan.carpenter@...cle.com>
CC:     <akhilrajeev@...dia.com>
Subject: [PATCH] dmaengine: tegra: Fix uninitialized variable usage

Initialize slave_bw and remove unused switch case in
get_transfer_param()

Fixes: ee17028009d4 ("dmaengine: tegra: Add tegra gpcdma driver")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Akhil R <akhilrajeev@...dia.com>
---
 drivers/dma/tegra186-gpc-dma.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c
index f12327732041..6b8d34165176 100644
--- a/drivers/dma/tegra186-gpc-dma.c
+++ b/drivers/dma/tegra186-gpc-dma.c
@@ -830,10 +830,6 @@ static int get_transfer_param(struct tegra_dma_channel *tdc,
 		*slave_bw = tdc->dma_sconfig.src_addr_width;
 		*csr = TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC;
 		return 0;
-	case DMA_MEM_TO_MEM:
-		*burst_size = tdc->dma_sconfig.src_addr_width;
-		*csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
-		return 0;
 	default:
 		dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
 	}
@@ -985,8 +981,8 @@ tegra_dma_prep_slave_sg(struct dma_chan *dc, struct scatterlist *sgl,
 {
 	struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
 	unsigned int max_dma_count = tdc->tdma->chip_data->max_dma_count;
+	enum dma_slave_buswidth slave_bw = DMA_SLAVE_BUSWIDTH_UNDEFINED;
 	u32 csr, mc_seq, apb_ptr = 0, mmio_seq = 0;
-	enum dma_slave_buswidth slave_bw;
 	struct tegra_dma_sg_req *sg_req;
 	struct tegra_dma_desc *dma_desc;
 	struct scatterlist *sg;
@@ -1103,12 +1099,12 @@ tegra_dma_prep_dma_cyclic(struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_l
 			  size_t period_len, enum dma_transfer_direction direction,
 			  unsigned long flags)
 {
+	enum dma_slave_buswidth slave_bw = DMA_SLAVE_BUSWIDTH_UNDEFINED;
+	u32 csr, mc_seq, apb_ptr = 0, mmio_seq = 0, burst_size;
+	unsigned int max_dma_count, len, period_count, i;
 	struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
 	struct tegra_dma_desc *dma_desc;
 	struct tegra_dma_sg_req *sg_req;
-	enum dma_slave_buswidth slave_bw;
-	u32 csr, mc_seq, apb_ptr = 0, mmio_seq = 0, burst_size;
-	unsigned int max_dma_count, len, period_count, i;
 	dma_addr_t mem = buf_addr;
 	int ret;
 
-- 
2.17.1