From: Tejun Heo <htejun@gmail.com>
To: Fajun Chen <fajunchen@gmail.com>
Cc: linux-ide@vger.kernel.org, jgarzik@pobox.com
Subject: Re: Some questions about new EH in libata
Date: Wed, 30 Aug 2006 01:00:26 +0900 [thread overview]
Message-ID: <44F4649A.80405@gmail.com> (raw)
In-Reply-To: <8202f4270608290851u20ec2eb5j2fd7e509f617cf35@mail.gmail.com>
Fajun Chen wrote:
> I assume that alt status register will be updated when pata/sata is
> back online. So as an alternative and less invasive way, could I check
> alt status register and start user scan only if device is ready on alt
> status register? libata has ata_altstatus() function, is it available
> to user space? If not, may I expose it? I'm looking for a way to check
> device registers without side effects.
You can't use alt status that way. Not all controllers have them and
even those which do show different behaviors over hotplug/unplugs.
Hmmm... maybe making userscan synchronous is the correct way to do it.
I'll give it some thoughts.
--
tejun
prev parent reply other threads:[~2006-08-29 16:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-22 4:54 Some questions about new EH in libata Fajun Chen
2006-08-22 5:10 ` Tejun Heo
2006-08-22 15:40 ` Fajun Chen
2006-08-22 15:51 ` Tejun Heo
2006-08-29 0:51 ` Fajun Chen
2006-08-29 2:16 ` Tejun Heo
2006-08-29 15:51 ` Fajun Chen
2006-08-29 16:00 ` Tejun Heo [this message]
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