From: Andrew Morton <akpm@osdl.org>
To: Jesse Stockall <stockall@magma.ca>
Cc: s.rivoir@gts.it, linux-kernel@vger.kernel.org, stern@rowland.harvard.edu
Subject: Re: 2.6.7-mm7
Date: Fri, 9 Jul 2004 13:00:45 -0700 [thread overview]
Message-ID: <20040709130045.211b6d50.akpm@osdl.org> (raw)
In-Reply-To: <1089402736.8067.12.camel@homer.blizzard.org>
Jesse Stockall <stockall@magma.ca> wrote:
>
> On Fri, 2004-07-09 at 14:54, Andrew Morton wrote:
> down_write_trylock(&usb_all_devices_rwsem));
> >
> > That's a bit unusual. Could you (or Alan) please explain the reason for
> > this a little more?
>
> I believe you want this thread
>
> http://marc.theaimsgroup.com/?l=linux-usb-devel&m=108923404032264&w=2
Oh, OK. Recursively taking an rwsem for reading is certainly deadlocky.
The main reason for not supporting this is that heavy down_read() traffic
can trivially livelock down_write() waiters. Alan's patch will introduce
that shortcoming.
Really, it would be better to get the locking sorted out.
next prev parent reply other threads:[~2004-07-09 20:04 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-09 6:50 2.6.7-mm7 Andrew Morton
2004-07-09 8:15 ` 2.6.7-mm7 Stefano Rivoir
2004-07-09 9:41 ` 2.6.7-mm7 Andrew Morton
2004-07-09 10:27 ` 2.6.7-mm7 Stefano Rivoir
2004-07-09 10:32 ` 2.6.7-mm7 Stefano Rivoir
2004-07-09 11:45 ` 2.6.7-mm7 Jesse Stockall
2004-07-09 18:54 ` 2.6.7-mm7 Andrew Morton
2004-07-09 19:52 ` 2.6.7-mm7 Jesse Stockall
2004-07-09 20:00 ` Andrew Morton [this message]
2004-07-09 22:21 ` 2.6.7-mm7 Greg KH
2004-07-09 19:56 ` 2.6.7-mm7 Alan Stern
2004-07-09 10:32 ` 2.6.7-mm7 Jurgen Kramer
2004-07-09 10:39 ` 2.6.7-mm7 Andrew Morton
2004-07-09 11:16 ` 2.6.7-mm7 Jurgen Kramer
2004-07-09 14:40 ` 2.6.7-mm7 Felipe Alfaro Solana
2004-07-09 16:40 ` 2.6.7-mm7 Jurgen Kramer
2004-07-09 11:44 ` 2.6.7-mm7 Michael Geithe
2004-07-09 22:15 ` 2.6.7-mm7 Greg KH
2004-07-10 0:07 ` 2.6.7-mm7 Michael Geithe
2004-07-09 20:38 ` 2.6.7-mm7 Joseph Fannin
2004-07-09 21:11 ` 2.6.7-mm7 Andrew Morton
2004-07-14 22:01 ` 2.6.7-mm7 Tom Rini
2004-07-17 16:17 ` 2.6.7-mm7 Paul Mackerras
2004-07-17 19:19 ` 2.6.7-mm7 Joseph Fannin
2004-07-09 21:04 ` 2.6.7-mm7 William Lee Irwin III
2004-07-09 22:11 ` 2.6.7-mm7 William Lee Irwin III
2004-07-09 22:14 ` 2.6.7-mm7 Andrew Morton
2004-07-09 22:24 ` 2.6.7-mm7 James Bottomley
2004-07-09 23:40 ` 2.6.7-mm7 Andrew Morton
2004-07-10 2:47 ` 2.6.7-mm7 James Bottomley
2004-07-10 4:34 ` 2.6.7-mm7 Joshua Kwan
2004-07-10 4:40 ` 2.6.7-mm7 Joshua Kwan
2004-07-10 18:29 ` 2.6.7-mm7 Diego Calleja García
2004-07-10 20:04 ` 2.6.7-mm7 Marcin Gibuła
2004-07-10 20:10 ` 2.6.7-mm7 Marcin Gibuła
2004-07-10 20:27 ` 2.6.7-mm7 Andrew Morton
2004-07-10 20:32 ` 2.6.7-mm7 Marcin Gibuła
2004-07-11 4:19 ` 2.6.7-mm7 Dax Kelson
2004-07-11 4:40 ` 2.6.7-mm7 Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2004-07-10 6:21 2.6.7-mm7 Zoltan Boszormenyi
[not found] <A6974D8E5F98D511BB910002A50A6647615FFB70@hdsmsx403.hd.intel.com>
2004-07-11 2:23 ` 2.6.7-mm7 Len Brown
2004-07-11 10:23 ` 2.6.7-mm7 Thomas Svedberg
2004-07-11 15:49 ` 2.6.7-mm7 Zoltan Boszormenyi
[not found] <A6974D8E5F98D511BB910002A50A6647615FFA5D@hdsmsx403.hd.intel.com>
2004-07-11 2:34 ` 2.6.7-mm7 Len Brown
2004-07-11 18:32 ` 2.6.7-mm7 Michael Geithe
[not found] <A6974D8E5F98D511BB910002A50A6647615FFA8A@hdsmsx403.hd.intel.com>
2004-07-11 2:36 ` 2.6.7-mm7 Len Brown
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