linux-kernel - Re: [PATCH 3/5] cmd64x: implement serialization as per notes

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Date:	Tue, 17 Nov 2009 18:35:05 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 3/5] cmd64x: implement serialization as per notes

On Tuesday 17 November 2009 15:51:32 Alan Cox wrote:

> +struct cmd_priv
> +{
> +	int dma_live;		/* Channel using DMA */
> +	int irq_t[2];		/* Register to check for IRQ */
> +	int irq_m[2];		/* Bit to check */
> +};

irq_t and irq_m content will be identical for all host instances
so you may as well add one instance for it, use ->private_data to
store dma_live information and remove cmd_priv allocation

> +	/* If the other port is not live then issue the command */
> +	if (alt == NULL || !alt->qc_active) {
> +		if (dma)
> +			priv->dma_live = qc->ap->port_no;
> +		return 0;
> +	}
> +	/* If there is a live DMA command then wait */
> +	if (priv->dma_live != -1)
> +		return 	ATA_DEFER_PORT;
> +	if (dma) {
> +		/* Cannot overlap our DMA command */
> +		if (alt->qc_active)
> +			return ATA_DEFER_PORT;

no need to check alt->qc_active again here

-- 
Bartlomiej Zolnierkiewicz
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