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

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Date:	Tue, 17 Nov 2009 18:08:18 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH 3/5] cmd64x: implement serialization as per notes

On Tue, 17 Nov 2009 18:35:05 +0100
Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:

> 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

Once I've had a look at the later chip variants I'll indeed do that
providing the 648 is ok in all revs.

> 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

Good point

Thanks for the review.
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