Re: [PATCH 2.6.19 2/3] sata_promise: new EH conversion

[Jeff Garzik <jeff@garzik.org>]

Tejun Heo wrote:
> Hello, Mikael.
>
> Thanks for doing this.
>
> Mikael Pettersson wrote:
> [--snip--]
> > +static void pdc_freeze(struct ata_port *ap)
> > +{
> > +	void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr;
> > +	u32 tmp;
> > +
> > +	tmp = readl(mmio + PDC_CTLSTAT);
> > +	tmp |= PDC_IRQ_DISABLE;
> > +	tmp &= ~PDC_DMA_ENABLE;
> > +	writel(tmp, mmio + PDC_CTLSTAT);
> > +	readl(mmio + PDC_CTLSTAT); /* flush *//* XXX: needed? sata_sil does this */
>
> Just drop the above line.
>
> > +}
> > +
> > +static void pdc_thaw(struct ata_port *ap)
> > +{
> > +	void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr;
> > +	u32 tmp;
> > +
> > +	/* clear IRQ */
> > +	readl(mmio + PDC_INT_SEQMASK);
> > +
> > +	/* turn IRQ back on */
> > +	tmp = readl(mmio + PDC_CTLSTAT);
> > +	tmp &= ~PDC_IRQ_DISABLE;
> > +	writel(tmp, mmio + PDC_CTLSTAT);
> > +	readl(mmio + PDC_CTLSTAT); /* flush *//* XXX: needed? */
>
> Ditto.

Why do you think these flushes are not needed?

	Jeff



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