Re: [PATCH] soc: fsl: cpm1: qmc: Fix qmc_probe() warn missing error code ret

[Christophe Leroy <christophe.leroy@csgroup.eu>]

Le 20/11/2024 à 10:38, Pei Xiao a écrit :
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> 
> platform_get_irq() may failed,but ret still equals to 0,
> will cacuse qmc_probe() return 0 but fail.
> 
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Closes: https://lore.kernel.org/r/202411051350.KNy6ZIWA-lkp@intel.com/
> Fixes: 3178d58e0b97 ("soc: fsl: cpm1: Add support for QMC")
> Signed-off-by: Pei Xiao <xiaopei01@kylinos.cn>
> ---
>   drivers/soc/fsl/qe/qmc.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
> index 19cc581b06d0..a78768cd6007 100644
> --- a/drivers/soc/fsl/qe/qmc.c
> +++ b/drivers/soc/fsl/qe/qmc.c
> @@ -2004,8 +2004,10 @@ static int qmc_probe(struct platform_device *pdev)
> 
>          /* Set the irq handler */
>          irq = platform_get_irq(pdev, 0);
> -       if (irq < 0)
> +       if (irq < 0) {
> +               ret = -EINVAL;

Why force -EINVAL ?

What if platform_get_irq() returns -EPROBE_DEFER ?

Anyway, this problem is already fixed by 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20241105145623.401528-1-herve.codina@bootlin.com/ 
which is on its way to mainline.

>                  goto err_exit_xcc;
> +       }
>          ret = devm_request_irq(qmc->dev, irq, qmc_irq_handler, 0, "qmc", qmc);
>          if (ret < 0)
>                  goto err_exit_xcc;
> --
> 2.34.1
>