linux-kernel - Re: [PATCH 2.6.19 2/3] sata

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Date:	Sun, 03 Dec 2006 08:03:39 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <htejun@...il.com>
CC:	Mikael Pettersson <mikpe@...uu.se>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.19 2/3] sata_promise: new EH conversion

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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