From: James Bottomley <James.Bottomley@steeleye.com>
To: Alan <alan@lxorguk.ukuu.org.uk>
Cc: Oliver Neukum <oliver@neukum.name>,
Luben Tuikov <luben@splentec.com>,
Matthew Dharm <mdharm-scsi@one-eyed-alien.net>,
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: Tue, 21 Jan 2003 08:30:35 -0500 [thread overview]
Message-ID: <200301211330.h0LDUZl02463@localhost.localdomain> (raw)
In-Reply-To: Message from Alan <alan@lxorguk.ukuu.org.uk> of "21 Jan 2003 03:31:54 GMT." <1043119913.13397.14.camel@dhcp22.swansea.linux.org.uk>
alan@lxorguk.ukuu.org.uk said:
> Providing you refcount objects and defer freeing of resources its not
> normally too terrible
We already have a struct device, which is a ref counted object precisely for
this purpose, embedded inside Scsi_Device.
One of the issues doing this is fast reattachment: the device goes away then
comes back before we've cleared the outstanding command queue.
In the latter case, I think we could use some of the work Luben Tuikov has
been doing to make the cmnd structures tie more closely to the device: as
long as we remove the device from user visibility as soon as it is removed, we
can keep the Scsi_Device object around until the ref count falls to zero, and
even create a new one while this is going on. Commands attached to the old
device still error out.
It would still be nice if the trigger for Scsi_device removal came from a USB
hotplug event at user level, but I'm not too bothered about that.
James
next prev parent reply other threads:[~2003-01-21 13:30 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
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 [this message]
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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