From: Tejun Heo <htejun@gmail.com>
To: albertl@mail.com
Cc: Jeff Garzik <jeff@garzik.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>, Doug Maxey <dwm@enoyolf.org>,
Mark Lord <mlord@pobox.com>,
Linux IDE <linux-ide@vger.kernel.org>
Subject: Re: [PATCH 7/7] libata: remove ap->last_ctl
Date: Fri, 13 Jul 2007 15:58:32 +0900 [thread overview]
Message-ID: <46972298.7020504@gmail.com> (raw)
In-Reply-To: <468F3F8B.5010200@tw.ibm.com>
Albert Lee wrote:
> With the previous changes made to tf_load(), ap->last_ctl is now unused. Remove it.
>
> (The purpose of ap->last_ctl is to cache the last status of nIEN bit
> and hopefully avoid writing the Control register unnecessarily.
> However, the libata polling code always call irq_on() in ata_hsm_qc_complete()
> and such mechanism isn't much utilized.)
>
> Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Ack 6-7. Thanks for cleaning irq on/off up. Things should have been
done this way from the beginning. Also, I think removing last_ctl
caching (or whatever is left of it) should be okay. Only polling PIO
path is affected and one or two more ioport accesses won't make any
meaningful difference anyway.
--
tejun
prev parent reply other threads:[~2007-07-13 6:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-07 6:57 [PATCH 0/7] libata: irq_on/off restructuring (take #2) Albert Lee
2007-07-07 7:00 ` [PATCH 1/7] libata: remove irq_on from ata_bus_reset() and ata_std_postreset() Albert Lee
2007-07-12 20:12 ` Jeff Garzik
2007-07-07 7:02 ` [PATCH 2/7] sata_promise: pdc_freeze() semantic change Albert Lee
2007-10-02 15:28 ` Jeff Garzik
2007-07-07 7:05 ` [PATCH 3/7] libata: add freeze/thaw to old EH LLDDs Albert Lee
2007-07-07 7:09 ` [PATCH 4/7] libata: use freeze/thaw for polling PIO Albert Lee
2007-07-13 6:53 ` Tejun Heo
2007-07-07 7:12 ` [PATCH 5/7] libata: integrate freeze/thaw with irq_on/off Albert Lee
2007-07-13 6:51 ` Tejun Heo
2007-07-16 9:17 ` Albert Lee
2007-07-07 7:20 ` [PATCH 6/7] libata: remove nIEN handling from ata_tf_load() Albert Lee
2007-07-07 7:23 ` [PATCH 7/7] libata: remove ap->last_ctl Albert Lee
2007-07-13 6:58 ` Tejun Heo [this message]
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