Re: [PATCH] EDAC/fsl_ddr: use non devm for request_irq()

[Frank Li]

On Tue, Jul 28, 2026 at 06:23:20PM -0700, Rosen Penev wrote:
> We need to tear down the irq before edac_mc_free() to avoid a use after
> free on teardown as request_irq uses mci as dev_id.
>
> Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
> ---
>  drivers/edac/fsl_ddr_edac.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/edac/fsl_ddr_edac.c b/drivers/edac/fsl_ddr_edac.c
> index f4cc89b26954..f1ddd1f47f2a 100644
> --- a/drivers/edac/fsl_ddr_edac.c
> +++ b/drivers/edac/fsl_ddr_edac.c
> @@ -601,7 +601,7 @@ int fsl_mc_err_probe(struct platform_device *op)
>
>  		/* register interrupts */
>  		pdata->irq = platform_get_irq(op, 0);
> -		res = devm_request_irq(&op->dev, pdata->irq,
> +		res = request_irq(pdata->irq,
>  				       fsl_mc_isr,
>  				       IRQF_SHARED,
>  				       "[EDAC] MC err", mci);
> @@ -639,6 +639,7 @@ void fsl_mc_err_remove(struct platform_device *op)
>
>  	if (edac_op_state == EDAC_OPSTATE_INT) {
>  		ddr_out32(pdata, FSL_MC_ERR_INT_EN, 0);
> +		free_irq(pdata->irq, mci);

here already disable hardware irq. Just call
synchronize_irq() to make sure pending irq handled.

Frank

>  	}
>
>  	ddr_out32(pdata, FSL_MC_ERR_DISABLE,
> --
> 2.55.0
>
>