From: David Brownell <david-b@pacbell.net>
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: Alan Stern <stern@rowland.harvard.edu>,
Mike Anderson <andmike@us.ibm.com>, Andrew Morton <akpm@osdl.org>,
greg@kroah.com, Jens Axboe <axboe@suse.de>,
linux-usb-devel@lists.sourceforge.net,
SCSI Mailing List <linux-scsi@vger.kernel.org>
Subject: Re: [linux-usb-devel] Re: bug 2400
Date: Tue, 06 Apr 2004 08:10:46 -0700 [thread overview]
Message-ID: <4072C876.7030906@pacbell.net> (raw)
In-Reply-To: <1081214360.1756.330.camel@mulgrave>
James Bottomley wrote:
> that's intra subsystem synchronisation, not inter subsystem
I'd say that device_driver.remove() calls from the bus management
code to a given device driver are inter-subsystem...
> Look, the rules are very simple:
>
> - Every subsystem gives out refcounted objects.
>
> - Every subsystem takes in a disconnection event for another object.
> ..
>
> If you follow these rules, there's no *inter* subsystem ordering or
> synchronisation requirement.
Well, either handling the disconnection event from the lower level
subsystem (bus) is such a requirement, or it's not necessary! I've
got to assume the former, since the Linux kernel doesn't garbage
collect its memory.
Refcounting systems need loop-breaking protocols ("disconnect");
this is needed for that sort of reason, if no other.
- Dave
next prev parent reply other threads:[~2004-04-06 15:11 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-01 21:15 bug 2400 Andrew Morton
2004-04-01 21:52 ` Matt Gulick
2004-04-01 22:08 ` Andrew Morton
2004-04-01 22:48 ` Matt Gulick
2004-04-01 22:40 ` James Bottomley
2004-04-01 22:53 ` Matt Gulick
2004-04-01 23:07 ` Matthew Dharm
2004-04-01 23:32 ` James Bottomley
2004-04-02 0:29 ` Steven Dake
2004-04-02 8:43 ` Mike Anderson
2004-04-02 15:57 ` James Bottomley
2004-04-02 16:45 ` Mike Anderson
2004-04-02 17:05 ` James Bottomley
2004-04-02 17:44 ` Mike Anderson
2004-04-02 18:13 ` James Bottomley
2004-04-02 23:40 ` Mike Anderson
2004-04-03 0:25 ` James Bottomley
2004-04-04 1:40 ` Alan Stern
2004-04-04 15:23 ` James Bottomley
2004-04-04 16:46 ` Alan Stern
2004-04-04 17:04 ` James Bottomley
2004-04-05 3:17 ` Alan Stern
2004-04-05 14:59 ` Mike Anderson
2004-04-05 21:27 ` James Bottomley
2004-04-06 14:00 ` Alan Stern
2004-04-05 22:10 ` Patrick Mansfield
2004-04-06 14:10 ` Alan Stern
2004-04-08 14:09 ` Alan Stern
2004-04-08 16:24 ` Matt Gulick
2004-04-08 18:33 ` Alan Stern
2004-04-08 19:44 ` Matt Gulick
2004-04-05 13:30 ` [linux-usb-devel] " Oliver Neukum
2004-04-04 18:16 ` David Brownell
2004-04-04 18:42 ` James Bottomley
2004-04-05 3:54 ` David Brownell
2004-04-05 21:44 ` James Bottomley
2004-04-05 23:23 ` [linux-usb-devel] " David Brownell
2004-04-06 1:19 ` James Bottomley
2004-04-06 6:52 ` Oliver Neukum
2004-04-06 14:03 ` James Bottomley
2004-04-07 9:19 ` Oliver.Neukum
2004-04-06 15:10 ` David Brownell [this message]
2004-04-06 15:47 ` James Bottomley
2004-04-06 16:16 ` David Brownell
2004-04-06 16:55 ` Alan Stern
2004-04-06 17:13 ` James Bottomley
2004-04-02 23:36 ` James Bottomley
2004-04-03 0:11 ` Mike Anderson
2004-04-03 0:16 ` James Bottomley
2004-04-05 4:33 ` Patrick Mansfield
2004-04-05 14:09 ` James Bottomley
2004-04-05 21:07 ` James Bottomley
2004-04-06 9:22 ` Jens Axboe
2004-04-06 13:56 ` James Bottomley
2004-04-06 14:04 ` Jens Axboe
2004-04-06 14:09 ` James Bottomley
2004-04-08 23:06 ` Greg KH
2004-04-09 11:28 ` James Bottomley
2004-04-05 14:03 ` Jens Axboe
2004-04-05 21:08 ` James Bottomley
2004-04-06 9:22 ` Jens Axboe
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