Re: [PATCH] dmaengine: sprd: fix clock imbalance when enabling ashb_clk fails

[Frank Li <Frank.li@oss.nxp.com>]

On Thu, Aug 13, 2026 at 10:53:54AM +0000, Chaithanya Lagisetty wrote:
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>
> sprd_dma_enable() enables sdev->clk and then enables the optional
> ashb_clk. If clk_prepare_enable() for ashb_clk fails, the function
> returns the error without disabling sdev->clk, which was already
> enabled. Both callers (probe and resume) treat a non-zero return as
> "nothing was enabled" and bail out, so sdev->clk is leaked.
>
> Disable sdev->clk on the ashb_clk enable failure path.
>
> Fixes: 9b3b8171f7f4 ("dmaengine: sprd: Add Spreadtrum DMA driver")
> Signed-off-by: Chaithanya Lagisetty <nagachaithanya9911@gmail.com>
> ---
>  drivers/dma/sprd-dma.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
> index 087fea3af2e4..3ea5c3ba1a8c 100644
> --- a/drivers/dma/sprd-dma.c
> +++ b/drivers/dma/sprd-dma.c
> @@ -270,9 +270,16 @@ static int sprd_dma_enable(struct sprd_dma_dev *sdev)
>          * The ashb_clk is optional and only for AGCP DMA controller, so we
>          * need add one condition to check if the ashb_clk need enable.
>          */
> -       if (!IS_ERR(sdev->ashb_clk))
> +       if (!IS_ERR(sdev->ashb_clk)) {
>                 ret = clk_prepare_enable(sdev->ashb_clk);
> +               if (ret)
> +                       goto disable_clk;
> +       }
>
> +       return 0;
> +
> +disable_clk:
> +       clk_disable_unprepare(sdev->clk);

Convert to clk bulk API.

Frank
>         return ret;
>  }
>
> --
> 2.43.0
>