Re: Notify about errors during initialization

[Matthew Dharm <mdharm-scsi@one-eyed-alien.net>]

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Did you ever get an answer from the linux-scsi people on this?

Matt

On Mon, Dec 08, 2003 at 11:15:06AM -0500, Alan Stern wrote:
> Cross-posted to the linux-scsi list in the hope that someone there can 
> confirm this answer...
> 
> On Sat, 6 Dec 2003, Matthew Dharm wrote:
> 
> > Question: Are we guaranteed that scsi_scan_host() doesn't return until the
> > scanning process is complete?
> 
> I'm not absolutely certain -- best to check with someone on the linux-scsi
> list.  But a quick look through the call chain in scsi_scan.c indicates
> that scsi_scan_host() doesn't return until the scanning process is indeed
> complete.  The real work is done in scsi_probe_lun() (called from
> scsi_probe_and_add_lun()), and that uses scsi_wait_req().  After all, it
> can't tell whether the LUN is there or not until it gets a reply to the
> INQUIRY!
> 
> > I recall a problem that we had with the setting of flags and the call to
> > scan the host -- without pre-emption, it worked, but with pre-emption
> > things happened in the wrong order.  Could that happen here?
> 
> I don't remember that problem.  But I don't think pre-emption would cause 
> any difficulties here.  All the flags should be set before we call 
> scsi_scan_host().  If you can provide more details or a reference to what 
> you're thinking of, I could reply in more detail.
> 
> When pre-emption does cause a problem it's generally because of some
> assumption that the current task won't be scheduled out when it calls up()
> or complete() or something like that.
> 
> Alan Stern
> 
> 
> 
> 
> 
> 

-- 
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

I'm just trying to think of a way to say "up yours" without getting fired.
					-- Stef
User Friendly, 10/8/1998

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