linux-kernel - Re: [RFC PATCH] sata_via: Apply WD workaround only when needed

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Date:	Tue, 16 Feb 2016 16:42:53 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	linux-ide@...r.kernel.org, Joseph Chan <JosephChan@....com.tw>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] sata_via: Apply WD workaround only when needed

Hello, Ondrej.

On Mon, Feb 15, 2016 at 10:01:47PM +0100, Ondrej Zary wrote:
> The first hdparm is slower because of the error:
> [   80.964060] ata5.00: exception Emask 0x12 SAct 0x0 SErr 0x1000500 action 0x6
> [   80.964095] ata5.00: BMDMA stat 0x5
> [   80.964108] ata5: SError: { UnrecovData Proto TrStaTrns }
> [   80.964125] ata5.00: failed command: READ DMA EXT
> [   80.964143] ata5.00: cmd 25/00:90:00:00:00/00:04:00:00:00/e0 tag 0 dma 598016 in
>          res 51/84:af:df:00:00/84:03:00:00:00/e0 Emask 0x12 (ATA bus error)
> [   80.964173] ata5.00: status: { DRDY ERR }
> [   80.964185] ata5.00: error: { ICRC ABRT }
> [   80.964209] ata5: hard resetting link
> [   81.284056] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
> [   81.300531] ata5.00: configured for UDMA/133
> [   81.300569] ata5: Incompatible drive (WD?): enabling workaround
> [   81.300598] ata5: EH complete

Hmm... I like the workaround but wish the kernel weren't generating
the above output.  How about doing something like the following?

svia_error_handler()
{
	if (workaround hasn't been applied yet &&
	    the conditions match for the workaround) {
		apply the workaround;
		mark as such;
		print informational message;
		set ATA_EHI_QUIET;
	}

	ata_sff_error_handler(ap);
}

-- 
tejun