From: Tejun Heo <tj@kernel.org>
To: Marc MERLIN <marc@merlins.org>
Cc: linux-ide@vger.kernel.org
Subject: Re: PMP SMART error recovery and failure code decoding help
Date: Mon, 17 Jan 2011 14:26:23 +0100 [thread overview]
Message-ID: <20110117132623.GD27123@htj.dyndns.org> (raw)
In-Reply-To: <20110116163950.GA691@merlins.org>
Hello,
On Sun, Jan 16, 2011 at 08:39:50AM -0800, Marc MERLIN wrote:
> Anyway, the problem happens with both drives that I manually spin down and
> drives that spin down on their own. I think it's not actually a 'real',
> error but more an issue where drives cannot answer some SMART error when
> they are spun down.
It could be that the drives need to spin up to answer the smart
command and the timeout on the smart commands is a bit too short for
that to happen. Forcing a disk access before issuing the smart
command could work around the problem.
> That said, is it normal/expected for the PMP code to do a full bus reset
> because of a SMART command that couldn't go through?
Yeah, after a timeout, the driver doesn't know what state the
controller / PMP / devices are in, so it's kind of forced to do full
reset.
Thanks.
--
tejun
next prev parent reply other threads:[~2011-01-17 13:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-16 16:39 PMP SMART error recovery and failure code decoding help Marc MERLIN
2011-01-17 13:26 ` Tejun Heo [this message]
2011-01-17 16:43 ` Marc MERLIN
2011-01-17 17:12 ` Tejun Heo
2011-01-17 17:29 ` Marc MERLIN
2011-06-29 17:14 ` Marc MERLIN
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