linux-kernel - Re: libata-core: devslp fails on ATP mSATA

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Message-ID: <20151201190410.GA21252@mtj.duckdns.org>
Date:	Tue, 1 Dec 2015 14:04:10 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Andreas Werner <andreas.werner@....de>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Hannes Reinecke <hare@...e.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: libata-core: devslp fails on ATP mSATA

On Tue, Dec 01, 2015 at 11:17:15AM -0500, Tejun Heo wrote:
> So, I suppose this is a fallout from 9faa643855df ("libata: use
> READ_LOG_DMA_EXT").  The description just says "we should try use it"
> but is there any benefit from using NCQ variant of read log page?  I
> mean, it's used during config and error handling, so it's not like
> queueing is gonna help anything.  It ends up issuing NCQ commands on
> controllers which don't support NCQ and causes failures on devices
> which lie about supporting the feature.

Hmmm... so, the controller locks up on READ_LOG_EXT issued as pio?
That's just weird.  I suppose you can blacklist the controller so that
any attempt to read the log page fails without actually issuing the
command.

Thanks.

-- 
tejun
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