> +	 * Use polling mode if there's no IRQ
quoted text
> +	 */
> +	if (irq < 0) {
> +		ap->flags |= ATA_FLAG_PIO_POLLING;
> +		ata_port_desc(ap, "no IRQ, using PIO polling");
> +	}
> +
> +	/*

Zero means no IRQ. Not < 0. We enforce that policy across the kernel and
Linus has been very clear about it.

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