From: Oliver Neukum <oliver@neukum.name>
To: Luben Tuikov <luben@splentec.com>,
Matthew Dharm <mdharm-scsi@one-eyed-alien.net>
Cc: Mike Anderson <andmike@us.ibm.com>,
David Brownell <david-b@pacbell.net>, Greg KH <greg@kroah.com>,
linux-usb-devel@lists.sourceforge.net,
Linux SCSI list <linux-scsi@vger.kernel.org>
Subject: Re: [linux-usb-devel] Re: [PATCH] USB changes for 2.5.58
Date: Mon, 20 Jan 2003 19:23:50 +0100 [thread overview]
Message-ID: <200301201923.50467.oliver@neukum.name> (raw)
In-Reply-To: <3E2C3380.3070700@splentec.com>
> I take it you mean that the transport will tell the LLDD that the device
> is gone and it (LLDD) call the one above, SCSI Core to remove the device.
>
> Hmm, more thinking needs to be done here, as shouldn't this be handled
> by hotplugging? I.e. Targets do not *initiate* events.
>
> The transport can notify that the device is gone, but an ULP entity will
> call scsi_remove_device() not the other way around.
NO!
This is an insanely complicated scheme.
We have no notification beforehand. User yanks out cable.
That's it. No preperation at all.
We as the writers of device drivers need a way to get rid of the device
as we are notified of the physical disconnect. It is not our job to maintain
devices in an undead state.
And a scheme that goes subsystem driver -> hotplugging -> script finding
corresponding devices -> script doing proc magic -> scsi layer notifying
low level driver is _not_ sensible. It triples the amount of complexity.
We need a simple scheme like
1. block further requests
2. kill old requests
3. remove device
Regards
Oliver
next prev parent reply other threads:[~2003-01-20 18:23 UTC|newest]
Thread overview: 104+ 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 [this message]
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
2003-01-20 21:51 ` [linux-usb-devel] " 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
2003-01-22 12:07 Bennie J. Venter
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