Re: libata-core: devslp fails on ATP mSATA

Tejun Heo
2015-12-01T19:04:13Z

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