linux-kernel - RE: [PATCH] sata_fsl: add workaround for data length mismatch on freescale V2 controller

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Date:	Tue, 4 Sep 2012 15:51:26 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Shaohui Xie" <Shaohui.Xie@...escale.com>, <jgarzik@...ox.com>,
	<linux-ide@...r.kernel.org>
Cc:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	"Anju Bhartiya" <Anju.Bhartiya@...escale.com>
Subject: RE: [PATCH] sata_fsl: add workaround for data length mismatch on freescale V2 controller

> +	/* Read command completed register */
> +	done_mask = ioread32(hcr_base + CC);
> +
> +	if (host_priv->quirks & SATA_FSL_QUIRK_V2_ERRATA) {
> +		if (unlikely(hstatus & INT_ON_DATA_LENGTH_MISMATCH)) {
> +			for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
> +				qc = ata_qc_from_tag(ap, tag);
> +				if (qc && ata_is_atapi(qc->tf.protocol))
{
> +					atapi_flag = 1;
> +					break;
> +				}
> +			}
> +		}
> +	}
> +
> +	/* Workaround for data length mismatch errata */
> +	if (atapi_flag) {

Seems to me like the conditionals for this code are all
in the wrong order - adding code to the normal path.

The whole lot should probably be inside:
	if (unlikely(hstatus & INT_ON_DATA_LENGTH_MISMATCH)) {
and the 'atapi_flag' boolean removed.

I also wonder it this is worthy of an actual quirk?
Might be worth doing anyway.

	David



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