Re: [PATCH for-5.10] spi: spi-mtk-nor: Don't leak SPI master in probe error path

[Ikjoon Jang <ikjn@xxxxxxxxxxxx>]

On Mon, Nov 16, 2020 at 4:43 PM Lukas Wunner <lukas@xxxxxxxxx> wrote:
>
> If the call to devm_spi_register_controller() fails on probe of the
> MediaTek SPI NOR driver, the spi_controller struct is erroneously not
> freed.
>
> Since commit a1daaa991ed1 ("spi: spi-mtk-nor: use dma_alloc_coherent()
> for bounce buffer"), the same happens if the call to
> dmam_alloc_coherent() fails.
>
> Since commit 3bfd9103c7af ("spi: spi-mtk-nor: Add power management
> support"), the same happens if the call to mtk_nor_enable_clk() fails.
>
> Fix by switching over to the new devm_spi_alloc_master() helper.
>
> Fixes: 881d1ee9fe81 ("spi: add support for mediatek spi-nor controller")
> Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>

Reviewed-by: Ikjoon Jang <ikjn@xxxxxxxxxxxx>

> Cc: <stable@xxxxxxxxxxxxxxx> # v5.7+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.7+
> Cc: Chuanhong Guo <gch981213@xxxxxxxxx>
> Cc: Ikjoon Jang <ikjn@xxxxxxxxxxxx>
> ---
>  drivers/spi/spi-mtk-nor.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
> index b97f26a60cbe..288f6c2bbd57 100644
> --- a/drivers/spi/spi-mtk-nor.c
> +++ b/drivers/spi/spi-mtk-nor.c
> @@ -768,7 +768,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
>                 return -EINVAL;
>         }
>
> -       ctlr = spi_alloc_master(&pdev->dev, sizeof(*sp));
> +       ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*sp));
>         if (!ctlr) {
>                 dev_err(&pdev->dev, "failed to allocate spi controller\n");
>                 return -ENOMEM;
> --
> 2.28.0
>