From: Albert Lee <albertcc@tw.ibm.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: albertl@mail.com, Tejun Heo <htejun@gmail.com>,
linux-ide@vger.kernel.org
Subject: Re: [PATCHSET] implement and use port_task
Date: Thu, 09 Mar 2006 16:39:50 +0800 [thread overview]
Message-ID: <440FE9D6.9040006@tw.ibm.com> (raw)
In-Reply-To: <440D3465.1040203@pobox.com>
Jeff Garzik wrote:
>
>
> Polling DMA support with nIEN=1 is theoretically invalid. You are not
> supposed to touch the ATA shadow register set until after receiving an
> irq event.
>
> On chipsets where nIEN=0 and the chip's IntrMask is also zero, its doable.
>
> I'm satisfied with simply never doing polling DMA, and change our mind
> only if a critical need arises.
>
>
Understand. After checking the code, polling DMA looks bad idea.
Thanks for the advice.
BTW, Tejun's proposal of pseudo periodic interrupts reminds me
of some patches to integrate the polling pio with irq-pio.
Will submit the patches for your review later.
Albert
next prev parent reply other threads:[~2006-03-09 8:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-05 6:28 [PATCHSET] implement and use port_task Tejun Heo
2006-03-07 6:13 ` Albert Lee
2006-03-07 7:01 ` Tejun Heo
2006-03-07 7:21 ` Jeff Garzik
2006-03-09 8:39 ` Albert Lee [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-03-05 6:29 Tejun Heo
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