Re: [PATCH] dma: jz4780: handle clk_prepare_enable() failure in probe

On Tue, Aug 18, 2026 at 04:41:31PM +0400, Jiawen Liu wrote:
> From: jiawen <[email protected]>

subject:

dmaengine: jz4780: propagate the return value of clk_prepare_enable() in probe

Frank
>
> jz4780_dma_probe() ignores the return value of clk_prepare_enable(). If
> the clock fails to enable, the driver continues and may later attempt to
> disable an unprepared clock on error paths, leading to unbalanced clock
> operations.
>
> Check the return value and propagate the error immediately, avoiding the
> erroneous cleanup.
>
> Signed-off-by: jiawen <[email protected]>
> ---
> diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
> --- a/drivers/dma/dma-jz4780.c
> +++ b/drivers/dma/dma-jz4780.c
> @@ -903,7 +903,9 @@
>  		return ret;
>  	}
>
> -	clk_prepare_enable(jzdma->clk);
> +	ret = clk_prepare_enable(jzdma->clk);
> +	if (ret)
> +		return ret;
>
>  	/* Property is optional, if it doesn't exist the value will remain 0. */
>  	of_property_read_u32_index(dev->of_node, "ingenic,reserved-channels",
>