linux-kernel - Re: [PATCH 1/4] scsi: Allow hosts to be flagged as hotpluggable

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Message-ID: <20090716085902.782f3fd6@lxorguk.ukuu.org.uk>
Date:	Thu, 16 Jul 2009 08:59:02 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 1/4] scsi: Allow hosts to be flagged as hotpluggable

> However, by definition SATA (like SAS) is a hotplug bus ... why isn't it
> set for some SATA controllers ... is it because the HBA itself does
> something wrong when a hotplug event comes in?

A lot of older controllers emulate various forms of the IDE interfaces.
They don't support detection/reporting of hotplug events to the OS. Some
of them support "warm-plug" - where you tell the controller the device is
going to go away, then remove it, then add a new one, then tell the
controller. Often they need to execute code when told these things (eg to
disable IORDY for PATA devices)

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