From: Alan Stern <stern@rowland.harvard.edu>
To: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Hugh Dickins <hugh@veritas.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Oliver Neukum <oneukum@suse.de>,
Maneesh Soni <maneesh@in.ibm.com>, <gregkh@suse.de>,
Richard Purdie <rpurdie@rpsys.net>,
James Bottomley <James.Bottomley@SteelEye.com>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.21-rc suspend regression: sysfs deadlock
Date: Wed, 14 Mar 2007 15:23:10 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.0703141516150.7723-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <20070314194337.5d439dab@gondolin.boeblingen.de.ibm.com>
On Wed, 14 Mar 2007, Cornelia Huck wrote:
> On Wed, 14 Mar 2007 12:12:37 -0400 (EDT),
> Alan Stern <stern@rowland.harvard.edu> wrote:
>
> > This seems more elegant (not yet tested). Cornelia, does it look okay to
> > you?
>
> Works for me (grouping & ungrouping ctc) and looks sane. Some more
> comments below.
Thank you.
> > +struct other_task_struct {
> > + struct kobject *kobj;
> > + void (*func)(void *);
> > + void *data;
> > + struct work_struct work;
> > +};
> > +
> > +static void other_task_work(struct work_struct *work)
> > +{
> > + struct other_task_struct *ots = container_of(work,
> > + struct other_task_struct, work);
> > +
> > + (ots->func)(ots->data);
> > + kobject_put(ots->kobj);
> > + kfree(ots);
> > +}
>
> The naming seems a bit unintuitive, but I don't have a good
> alternative idea. Perhaps sysfs_work_struct, sysfs_delayed_work()?
sysfs_work_struct is too generic; other parts of sysfs might also want to
use workqueues for different purposes.
I don't like calling it "delayed"-anything, because the operations aren't
necessarily delayed! On an SMP system they might even execute before the
sysfs_access_in_other_task() call returns. (Although the two examples we
have so far can't do that because of lock contention.)
The major feature added here is that the work takes place in a different
task's context, not that it is delayed. Hence the choice of names.
Alan Stern
next prev parent reply other threads:[~2007-03-14 19:23 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-08 13:05 refcounting drivers' data structures used in sysfs buffers Oliver Neukum
2007-03-08 16:02 ` Alan Stern
2007-03-09 0:45 ` Oliver Neukum
2007-03-09 16:32 ` Alan Stern
2007-03-09 16:44 ` Oliver Neukum
2007-03-09 17:02 ` Dmitry Torokhov
2007-03-09 17:18 ` Oliver Neukum
2007-03-09 17:34 ` Dmitry Torokhov
2007-03-09 19:32 ` Alan Stern
2007-03-09 20:05 ` Oliver Neukum
2007-03-09 20:27 ` Alan Stern
2007-03-09 20:39 ` Oliver Neukum
2007-03-09 20:08 ` Alan Stern
2007-03-09 20:48 ` Oliver Neukum
2007-03-10 19:19 ` Alan Stern
2007-03-12 8:54 ` Oliver Neukum
2007-03-12 14:57 ` Alan Stern
2007-03-12 15:23 ` Oliver Neukum
2007-03-12 15:42 ` Dmitry Torokhov
2007-03-12 15:59 ` Oliver Neukum
2007-03-12 16:21 ` Alan Stern
2007-03-12 18:25 ` Oliver Neukum
2007-03-12 19:31 ` Alan Stern
2007-03-12 19:49 ` Oliver Neukum
2007-03-12 20:03 ` Alan Stern
2007-03-12 20:15 ` Oliver Neukum
2007-03-12 20:31 ` Dmitry Torokhov
2007-03-12 20:45 ` Alan Stern
2007-03-12 21:31 ` Richard Purdie
2007-03-13 15:00 ` 2.6.21-rc suspend regression: sysfs deadlock Alan Stern
2007-03-13 18:42 ` Cornelia Huck
2007-03-13 21:20 ` Linus Torvalds
2007-03-14 16:12 ` Alan Stern
2007-03-14 18:43 ` Cornelia Huck
2007-03-14 19:23 ` Alan Stern [this message]
2007-03-15 10:27 ` Cornelia Huck
2007-03-15 12:31 ` Hugh Dickins
2007-03-15 13:02 ` Oliver Neukum
2007-03-15 13:22 ` Dmitry Torokhov
2007-03-15 13:59 ` Hugh Dickins
2007-03-15 14:27 ` Alan Stern
2007-03-15 15:32 ` Cornelia Huck
2007-03-15 16:29 ` Hugh Dickins
2007-03-15 16:51 ` Linus Torvalds
2007-03-15 19:50 ` [PATCH] sysfs and driver core: add callback helper, used by SCSI and S390 Alan Stern
2007-03-15 19:51 ` [PATCH] sysfs: reinstate exclusion between method calls and attribute unregistration Alan Stern
2007-03-13 19:00 ` 2.6.21-rc suspend regression: sysfs deadlock Hugh Dickins
2007-03-13 20:09 ` Alan Stern
2007-03-13 20:55 ` Hugh Dickins
2007-03-13 21:08 ` Dmitry Torokhov
2007-03-13 21:20 ` Alan Stern
-- strict thread matches above, loose matches on Subject: below --
2007-03-10 20:44 Alan Stern
2007-03-06 19:20 Hugh Dickins
2007-03-06 20:16 ` Oliver Neukum
2007-03-07 1:56 ` Linus Torvalds
2007-03-07 14:38 ` Oliver Neukum
2007-03-07 15:56 ` Dmitry Torokhov
2007-03-07 16:52 ` Linus Torvalds
2007-03-07 16:59 ` Oliver Neukum
2007-03-07 18:02 ` Linus Torvalds
2007-03-07 18:16 ` Oliver Neukum
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