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

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Date:   Fri, 22 Apr 2022 12:55:56 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Akhil R <akhilrajeev@...dia.com>
Cc:     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,
        dan.carpenter@...cle.com
Subject: Re: [PATCH] dmaengine: tegra: Fix uninitialized variable usage

On 20-04-22, 18:52, Akhil R wrote:
> Initialize slave_bw and remove unused switch case in
> get_transfer_param()

Two patches please, unused patch can go to next while fix goes to fixes

> 
> 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

-- 
~Vinod