Re: libata-core: devslp fails on ATP mSATA

[Tejun Heo]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/