From: David Brownell <david-b@pacbell.net>
To: Oliver Neukum <oliver@neukum.name>
Cc: Luben Tuikov <luben@splentec.com>,
Matthew Dharm <mdharm-scsi@one-eyed-alien.net>,
Mike Anderson <andmike@us.ibm.com>, Greg KH <greg@kroah.com>,
linux-usb-devel@lists.sourceforge.net,
Linux SCSI list <linux-scsi@vger.kernel.org>
Subject: Re: Re: [PATCH] USB changes for 2.5.58
Date: Mon, 20 Jan 2003 13:24:08 -0800 [thread overview]
Message-ID: <3E2C68F8.7080405@pacbell.net> (raw)
In-Reply-To: 200301202148.23210.oliver@neukum.name
Oliver Neukum wrote:
> That model cannot be applied to SCSI as it is much more diverse
> in the number of bus types it supports.
> USB can do it, because it knows about hubs. SCSI cannot,
> as there are no hubs in SCSI.
Hubs are irrelevant here, the key functionality is noticing
hardware addition/disconnect. Parts of it can be done in bus
adapter code, parts of it can't. SCSI probes LUNS in much
the same way khubd probes hub ports, and as I recall most of
that logic isn't any more specific to the adapter than virtual
root hub code is for USB.
>>Those disconnect() callbacks have a few key responsibilities, very
>>much including shutting down the entire higher level I/O queue to
>>that device. I think you're saying that SCSI drivers don't have
>>such a responsibility (unlike USB or PCI) ... if so, that would
>>seem to be worth changing.
>
>
> If the scsi layer cannot on its own detect that a device or a bus is gone,
> there'll be no sense in having a callback. It's just a complication.
Erm ... which of the three SCSI layers are you talking about? I was
talking about the highest level, which is precisely the layer I think
has been identified as already needing to know when to shut down the
I/O queues (sd_mod and friends).
- Dave
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next prev parent reply other threads:[~2003-01-20 21:24 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <10426732153816@kroah.com>
[not found] ` <10426732212871@kroah.com>
[not found] ` <20030116093112.B29001@one-eyed-alien.net>
[not found] ` <20030116173539.GA31235@kroah.com>
2003-01-16 19:43 ` [linux-usb-devel] Re: [PATCH] USB changes for 2.5.58 Matthew Dharm
2003-01-16 19:53 ` Greg KH
[not found] ` <20030116195306.GA32697@kroah.com>
2003-01-16 20:10 ` Linus Torvalds
2003-01-16 20:43 ` greg kh
2003-01-16 21:41 ` Linus Torvalds
2003-01-16 22:51 ` Matthew Dharm
2003-01-16 20:40 ` David Brownell
2003-01-16 20:48 ` Mike Anderson
2003-01-16 23:43 ` Oliver Neukum
2003-01-17 8:50 ` Mike Anderson
2003-01-17 10:55 ` Oliver Neukum
2003-01-17 15:06 ` Alan Stern
2003-01-17 18:54 ` Matthew Dharm
2003-01-17 20:25 ` Mike Anderson
2003-01-17 22:07 ` Oliver Neukum
2003-01-17 20:26 ` [linux-usb-devel] " Oliver Neukum
2003-01-17 20:49 ` Mike Anderson
2003-01-20 17:36 ` Luben Tuikov
2003-01-20 18:23 ` Oliver Neukum
2003-01-20 18:56 ` Luben Tuikov
2003-01-20 19:10 ` [linux-usb-devel] " Oliver Neukum
2003-01-20 19:50 ` David Brownell
2003-01-21 3:31 ` Alan
2003-01-21 7:17 ` Oliver Neukum
2003-01-21 11:57 ` [linux-usb-devel] " Douglas Gilbert
2003-01-21 13:48 ` Oliver Neukum
2003-01-21 18:22 ` Luben Tuikov
2003-01-21 13:30 ` James Bottomley
2003-01-20 20:08 ` David Brownell
2003-01-20 20:48 ` [linux-usb-devel] " Oliver Neukum
2003-01-20 21:24 ` David Brownell [this message]
2003-01-20 21:51 ` Oliver Neukum
2003-01-20 22:26 ` David Brownell
2003-01-20 23:00 ` Oliver Neukum
2003-01-21 0:44 ` David Brownell
2003-01-21 0:50 ` Oliver Neukum
2003-01-21 18:16 ` Luben Tuikov
2003-01-21 19:00 ` Oliver Neukum
2003-01-21 20:02 ` [linux-usb-devel] " Luben Tuikov
2003-01-21 21:02 ` Alan Stern
2003-01-22 21:50 ` Luben Tuikov
2003-01-22 22:46 ` Oliver Neukum
2003-01-23 17:46 ` Luben Tuikov
2003-01-23 18:19 ` Oliver Neukum
2003-01-23 19:07 ` Luben Tuikov
2003-01-23 19:40 ` Oliver Neukum
2003-01-23 20:28 ` Doug Ledford
2003-01-23 20:59 ` Oliver Neukum
2003-01-23 21:34 ` Doug Ledford
2003-01-23 22:39 ` Oliver Neukum
2003-01-23 23:23 ` Doug Ledford
2003-01-23 23:25 ` Matthew Dharm
2003-01-24 15:34 ` Alan Stern
2003-01-24 16:06 ` Oliver Neukum
2003-01-24 17:58 ` [linux-usb-devel] " Doug Ledford
2003-01-24 19:00 ` Luben Tuikov
2003-01-24 22:23 ` Oliver.Neukum
2003-01-24 19:10 ` Luben Tuikov
2003-01-24 19:56 ` [linux-usb-devel] " Alan Stern
2003-01-24 20:11 ` Luben Tuikov
2003-01-24 21:09 ` Luben Tuikov
2003-01-24 21:55 ` Alan Stern
2003-01-24 22:03 ` Luben Tuikov
2003-01-24 23:21 ` Mike Anderson
2003-01-24 21:48 ` Doug Ledford
2003-01-24 22:59 ` Mike Anderson
2003-01-24 23:17 ` [linux-usb-devel] " Doug Ledford
2003-01-25 0:24 ` Luben Tuikov
2003-01-25 1:35 ` Mike Anderson
2003-01-24 23:25 ` Matthew Dharm
2003-01-25 0:05 ` Doug Ledford
2003-01-25 0:45 ` Matthew Dharm
2003-01-25 1:07 ` Doug Ledford
2003-02-02 18:13 ` Matthew Dharm
2003-02-02 20:06 ` Matthew Dharm
2003-02-03 17:17 ` Mike Anderson
2003-02-16 21:18 ` Matthew Dharm
2003-02-17 19:37 ` Mike Anderson
2003-02-17 19:51 ` Patrick Mansfield
2003-02-23 7:48 ` Matthew Dharm
2003-02-26 23:37 ` Mike Anderson
2003-02-27 1:10 ` Matthew Dharm
2003-02-27 6:37 ` Mike Anderson
2003-02-27 19:32 ` Matthew Dharm
2003-03-01 1:41 ` Matthew Dharm
2003-02-02 3:49 ` Matthew Dharm
2003-01-25 1:24 ` Luben Tuikov
2003-01-24 0:15 ` Patrick Mansfield
2003-01-24 8:33 ` David Brownell
2003-01-23 20:41 ` A different look at block device hotswap in the Linux kernel Steven Dake
2003-01-23 21:07 ` Matthew Jacob
2003-01-23 21:06 ` Steven Dake
2003-01-23 21:16 ` Matthew Jacob
2003-01-24 0:07 ` Oliver Neukum
2003-01-24 0:21 ` Matthew Jacob
2003-01-24 7:53 ` David Brownell
2003-01-24 15:26 ` Matthew Jacob
2003-01-24 0:54 ` Steven Dake
2003-01-24 2:35 ` [linux-usb-devel] " Matthew Dharm
2003-01-22 21:30 ` [linux-usb-devel] Re: [PATCH] USB changes for 2.5.58 David Brownell
2003-01-20 22:16 ` Luben Tuikov
2003-01-20 22:51 ` David Brownell
2003-01-20 23:27 ` Oliver Neukum
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