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List:       linux-kernel
Subject:    Re: [PATCH] [RFC] Advanced TCA SCSI Disk Hotswap
From:       "Scott Murray" <scottm () somanetworks ! com>
Date:       2002-10-25 0:18:19
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On Thu, 24 Oct 2002, Greg KH wrote:

> On Thu, Oct 24, 2002 at 07:00:23PM -0400, Scott Murray wrote:
> >
> > I've not implemented it yet, but I'm pretty sure I can detect surprise
> > extractions in my cPCI driver.  The only thing holding me back at the
> > moment is that there's no clear way to report this status change via
> > pcihpfs without doing something a bit funky like reporting "-1" in the
> > "adapter" node.
>
> Why would you need to report anything other than if the card is present
> or not?  What would a "supprise" removal cause you to do differently?

Thinking about it a bit more, my idea to use -1 is indeed unnecessary,
since userspace code can check if the adapter node changes to 0 before
it itself writes a 0 to it.  If multiple users/software play around with
the nodes at the same time, they'll get what's coming to them...

> Hm, well I guess we should be extra careful in trying to shut down any
> driver bound to that card...

Yeah, as Steven mentions in his reply, Linux drivers don't handle this
well at the moment.

Scott


-- 
Scott Murray
SOMA Networks, Inc.
Toronto, Ontario
e-mail: scottm@somanetworks.com


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