From: Jeff Garzik <jeff@garzik.org>
To: Tejun Heo <tj@kernel.org>
Cc: IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: Re: Commit 54c38444fad6a99b4b19512f8f0055d69115e69e
Date: Thu, 17 Sep 2009 03:11:18 -0400 [thread overview]
Message-ID: <4AB1E116.6030600@garzik.org> (raw)
In-Reply-To: <4AB0D258.60503@kernel.org>
On 09/16/2009 07:56 AM, Tejun Heo wrote:
> Jeff,
>
> Commit 54c38444fad6a99b4b19512f8f0055d69115e69e triggers
> WARN_ON_ONCE(ap->pflags& ATA_PFLAG_FROZEN); in ata_qc_complete().
>> From the commit history, it seems the change was to add DMA engine
> disable to sil_freeze(), right? I can't see why changing the orders
> would matter there. ata_port_abort() just changes the internal state
> of libata and doesn't affect low level driver or the hardware.
ata_port_abort does more than change internal state: it calls
ata_qc_complete, which could trigger a taskfile register read.
All SFF BMDMA controllers /must/ disable the DMA engine, before touching
the taskfile device register block.
Jeff
next prev parent reply other threads:[~2009-09-17 7:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-16 11:56 Commit 54c38444fad6a99b4b19512f8f0055d69115e69e Tejun Heo
2009-09-17 7:11 ` Jeff Garzik [this message]
2009-09-17 7:30 ` Tejun Heo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4AB1E116.6030600@garzik.org \
--to=jeff@garzik.org \
--cc=linux-ide@vger.kernel.org \
--cc=tj@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.