From: Alan Cox <alan@linux.intel.com>
To: samu.p.onkalo@nokia.com
Cc: gregkh@suse.de, Andrew Morton <akpm@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: sysfs and power management
Date: Wed, 27 Oct 2010 12:48:16 +0100 [thread overview]
Message-ID: <20101027124816.7087436a@linux.intel.com> (raw)
In-Reply-To: <1288177143.12206.22.camel@4fid08082>
> I started to wonder if it makes sense to enhance sysfs so that it
> optionally prodives open / close call backs. Internally sysfs has
> some bookkeeping about the refcount but this is not visible to the
> driver. Of course majority of the sysfs users doesn't need that at all
> and for them this is just overhead.
I think we need it. There doesn't need to be much overhead however as
there is no need (or sense) in providing per sysfs node open/close
hooks.
The pm layer also lacks a clean race-free way to actually ascertain
when the device was last kicked out of pm saving.
next prev parent reply other threads:[~2010-10-27 12:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-27 10:59 sysfs and power management Onkalo Samu
2010-10-27 11:48 ` Alan Cox [this message]
2010-10-27 13:43 ` samu.p.onkalo
2010-10-27 14:28 ` Alan Cox
2010-10-29 19:50 ` Greg KH
2010-10-30 14:00 ` Henrique de Moraes Holschuh
2010-10-31 11:57 ` Onkalo Samu
2010-10-31 14:25 ` Greg KH
2010-11-01 10:41 ` Onkalo Samu
2010-11-01 16:57 ` Alan Cox
2010-11-01 18:07 ` Greg KH
2010-11-03 9:44 ` Alan Cox
2010-11-03 10:48 ` samu.p.onkalo
2010-11-03 13:09 ` Greg KH
2010-11-03 15:00 ` samu.p.onkalo
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