linux-kernel - Re: [boot regression PATCH] libata: allow xgene-ahci to opt-out of tag ordered submission

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Date:	Fri, 6 Jun 2014 14:35:26 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Dave Jiang <dave.jiang@...el.com>,
	Ming Lei <ming.lei@...onical.com>,
	Ed Ciechanowski <ed.ciechanowski@...el.com>,
	stable@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"IDE/ATA development list" <linux-ide@...r.kernel.org>,
	Loc Ho <lho@....com>, Suman Tripathi <stripathi@....com>,
	Tuan Phan <tphan@....com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>
Subject: Re: [boot regression PATCH] libata: allow xgene-ahci to opt-out of
 tag ordered submission

On Fri, Jun 6, 2014 at 8:52 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> Ming Lei reports:
>   "Looks the commit 8a4aeec8d(libata/ahci: accommodate tag ordered
>    controllers) causes below sata failure on APM AHCI controller.
>
>    And the error does disappear after reverting the commit.
>
>      ata4.00: exception Emask 0x40 SAct 0xff00 SErr 0x800 action 0x6 frozen
>      ata4: SError: { HostInt }
>      ata4.00: failed command: READ FPDMA QUEUED
>      ata4.00: cmd 60/08:40:e0:a4:88/00:00:04:00:00/40 tag 8 ncq 4096 in
>               res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x44 (timeout)"
>
> http://marc.info/?l=linux-kernel&m=140195842716315&w=2
>
> Maintain tag ordered submission as the default, but allow xgene-ahci to
> continue with the old behavior.
>
> Cc: Loc Ho <lho@....com>
> Cc: <stable@...r.kernel.org>
> Cc: Tuan Phan <tphan@....com>
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: Suman Tripathi <stripathi@....com>
> Cc: Ed Ciechanowski <ed.ciechanowski@...el.com>
> Cc: Matthew Wilcox <matthew.r.wilcox@...el.com>
> Tested-by: Ming Lei <ming.lei@...onical.com>
> Reported-by: Ming Lei <ming.lei@...onical.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---

Hold off on this as it appears an ahci_xgene fix is on its way.
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