From: James Bottomley <James.Bottomley@steeleye.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: martin@lorenz.eu.org,
USB development list <linux-usb-devel@lists.sourceforge.net>,
SCSI development list <linux-scsi@vger.kernel.org>
Subject: Re: [linux-usb-devel] usb-storage / scsi : new scsi host on each plug
Date: 29 Oct 2003 09:53:33 -0600 [thread overview]
Message-ID: <1067442814.1829.21.camel@mulgrave> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0310291020430.874-100000@ida.rowland.org>
On Wed, 2003-10-29 at 09:24, Alan Stern wrote:
> > no matter which USB-storage-device I attach (tried CD-ROM,
> > Flash Card Reader and memory stick) I get a new scsi host
> > every time i plug a device in.
> >
> > so when changing devices for several times I finally end up
> > with /dev/scsi/host0 to 17 or more (diden't go on)
>
> This is a SCSI issue, not a USB one. Maybe someone on the
> SCSI development list can enlighten us. As far as I can tell, the host
> number is simply incremented every time a new host, of whatever sort, is
> added. The numbers never get reused.
This is really a design feature. Not reusing hosts gives us time to
clean up the old one before the new one is initialised (and prevents
races where we could be trying to plug in a new host at the same time
we're cleaning up the old one).
In 2.6 udev discovery should ensure these devices come back to the same
name.
James
next prev parent reply other threads:[~2003-10-29 15:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1AEoQX-0005kQ-Cz@mail.holoclan.de>
2003-10-29 15:24 ` [linux-usb-devel] usb-storage / scsi : new scsi host on each plug Alan Stern
2003-10-29 15:53 ` James Bottomley [this message]
2003-11-07 6:24 ` Douglas Gilbert
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