linux-kernel - Re: sata_mv port lockup on hotplug (kernel 2.6.38.2)

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Message-ID: <20110425113036.GL17734@mtj.dyndns.org>
Date:	Mon, 25 Apr 2011 13:30:36 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Bruce Stenning <b.stenning@...igovision.com>
Cc:	Mark Lord <kernel@...savvy.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: sata_mv port lockup on hotplug (kernel 2.6.38.2)

On Mon, Apr 25, 2011 at 12:07:04PM +0100, Bruce Stenning wrote:
> Tejun, what does it mean to limit a sata link to UDMA/100? I thought that this
> was only for ata devices, and sata devices have the choice of 1.5Gbps, 3Gbps,
> or 6 Gbps. Is that a false assumption? Is it related to early sata devices that
> were still somewhat based on parallel ata designs?

Yeap, devices behind SATA-PATA bridge were still affected by the
transfer mode so libata tries to slow them down too along with link
speed when limiting speed due to errors.  Shouldn't affect native SATA
devices.

-- 
tejun
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