[PATCH v2 11/11] RAS: add DeviceTree firmware-first CPER provider

[Krzysztof Kozlowski]

On 20/02/2026 14:42, Ahmed Tiba wrote:
> +	rc = ghes_ffh_init_ack(pdev, ctx);
> +	if (rc)
> +		return rc;
> +
> +	rc = ghes_ffh_init_pool();
> +	if (rc)
> +		return rc;
> +
> +	ctx->estatus = devm_kzalloc(&pdev->dev, ctx->status_len, GFP_KERNEL);
> +	if (!ctx->estatus)
> +		return -ENOMEM;
> +
> +	ctx->generic = devm_kzalloc(&pdev->dev, sizeof(*ctx->generic), GFP_KERNEL);
> +	if (!ctx->generic)
> +		return -ENOMEM;
> +
> +	ctx->generic->header.type = ACPI_HEST_TYPE_GENERIC_ERROR;
> +	ctx->generic->header.source_id =
> +		atomic_inc_return(&ghes_ffh_source_ids);
> +	ctx->generic->notify.type = ctx->sync ?
> +		ACPI_HEST_NOTIFY_SEA : ACPI_HEST_NOTIFY_EXTERNAL;
> +	ctx->generic->error_block_length = ctx->status_len;
> +
> +	ctx->irq = platform_get_irq_optional(pdev, 0);

Please read the kerneldoc - wrong check in if.

> +	if (ctx->irq <= 0) {
> +		if (ctx->irq == -EPROBE_DEFER)
> +			return ctx->irq;
> +		dev_err(&pdev->dev, "interrupt is required (%d)\n", ctx->irq);
> +		return -EINVAL;
> +	}
> +
> +	rc = devm_request_threaded_irq(&pdev->dev, ctx->irq,
> +				       NULL, ghes_ffh_irq,
> +				       IRQF_ONESHOT,
> +				       dev_name(&pdev->dev), ctx);
> +	if (rc)
> +		return rc;
> +
> +	platform_set_drvdata(pdev, ctx);
> +	dev_info(&pdev->dev, "Firmware-first CPER status provider (interrupt)\n");

This does not look like useful printk message. Drivers should be silent
on success:
https://elixir.bootlin.com/linux/v6.15-rc7/source/Documentation/process/coding-style.rst#L913
https://elixir.bootlin.com/linux/v6.15-rc7/source/Documentation/process/debugging/driver_development_debugging_guide.rst#L79

> +	return 0;
> +}
> +
> +static void ghes_ffh_remove(struct platform_device *pdev)
> +{
> +}
> +
> +static const struct of_device_id ghes_ffh_of_match[] = {
> +	{ .compatible = "arm,ras-ffh" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, ghes_ffh_of_match);
> +
> +static struct platform_driver ghes_ffh_driver = {
> +	.driver = {
> +		.name = "esource-dt",
> +		.of_match_table = ghes_ffh_of_match,
> +	},
> +	.probe = ghes_ffh_probe,
> +	.remove = ghes_ffh_remove,
> +};
> +
> +module_platform_driver(ghes_ffh_driver);
> +
> +MODULE_AUTHOR("Ahmed Tiba <ahmed.tiba at arm.com>");
> +MODULE_DESCRIPTION("Firmware-first CPER provider for DeviceTree platforms");
> +MODULE_LICENSE("GPL");
Best regards,
Krzysztof