linux-kernel - Re: [PATCH 2/5] dmaengine: ti: k3-udma: Fix BCDMA for case w/o BCHAN

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Message-ID: <c56e89a3-3a35-8a5a-8f39-a4e82b19a092@gmail.com>
Date:   Sat, 10 Dec 2022 10:24:18 +0200
From:   Péter Ujfalusi <peter.ujfalusi@...il.com>
To:     Vignesh Raghavendra <vigneshr@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dmaengine: ti: k3-udma: Fix BCDMA for case w/o BCHAN



On 12/6/22 06:35, Vignesh Raghavendra wrote:
> Reusing loop iterator fails if BCHAN is not present as iterator is
> uninitialized
> 
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> ---
>  drivers/dma/ti/k3-udma.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index ce8b80bb34d7..791cf6354946 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -4758,6 +4758,7 @@ static int bcdma_setup_resources(struct udma_dev *ud)
>  		}
>  	}
>  
> +	i = 0;

I think this would be more appropriate:
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index ce8b80bb34d7..7f8737da3613 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -4774,6 +4774,8 @@ static int bcdma_setup_resources(struct udma_dev *ud)
 				irq_res.desc[i].num = rm_res->desc[i].num;
 			}
 		}
+	} else {
+		i = 0;
 	}
 	if (ud->tchan_cnt) {
 		rm_res = tisci_rm->rm_ranges[RM_RANGE_TCHAN];


>  	irq_res.desc = kcalloc(irq_res.sets, sizeof(*irq_res.desc), GFP_KERNEL);
>  	if (!irq_res.desc)
>  		return -ENOMEM;


-- 
Péter