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Date:      Tue, 25 May 2010 09:25:16 -0700
From:      Matthew Jacob <mj@feral.com>
To:        freebsd-scsi@freebsd.org
Subject:   Re: patches for CAM SCSI probing, etc.
Message-ID:  <4BFBF9EC.9000700@feral.com>
In-Reply-To: <4BFB3985.1030301@FreeBSD.org>
References:  <4BEB87B8.1070104@feral.com>	<mailpost.1274725877.820236.58062.mailing.freebsd.scsi@FreeBSD.cs.nctu.edu.tw> <4BFB3985.1030301@FreeBSD.org>

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Part of the reason I went the way you had done for ATA is to try and 
guarantee one and one only probe action at a time per nexus.


> you are slightly changing semantics of device probe. Previously, probe
> call means warranty that device will be probed from the beginning after
> the moment of request. It is very important for ATA, as probe function
> also initializes device, that is mandatory if probe is called as result
> of device reset. SCSI devices probably don't need that initialization,
> but what if probe was called due to inquiry change status received
> during probe sequence running? Are you sure you won't loose events here?
>
>    




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