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From: David Brownell <david-b@pacbell.net>
To: yi.y.yang@intel.com, pavel@ucw.cz, linux-pm@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: [linux-pm][PATCH] base: Change power/wakeup output from "" to  "unsupported" if wakeup feature isn't supported by a device
Date: Fri, 04 Jan 2008 08:31:01 -0800	[thread overview]
Message-ID: <20080104163101.EDC02115203@adsl-69-226-248-13.dsl.pltn13.pacbell.net> (raw)
In-Reply-To: <1199441414.19185.9.camel@yangyi-dev.bj.intel.com>

> This patch changes empty output to "unsupported" in order that a user knows
> wakeup feature isn't supported by this device when he/she
> 'cat /sys/devices/.../power/wakeup', please consider to apply, thanks.

I don't much like this patch.  Not just for the technical reasons
mentioned in my previous note ... but also because it doesn't update
the documention at the top, which clearly states that "\n" is
returned for "temporary or permanent inability to issue wakeup".
And then it gives the example I gave before ...

Though I suppose a patch that changes the *entire* userspace interface,
(which includes its documentation, and all out-of-tree users) would have
shown more clearly why it wasn't a good idea.  ;)


> --- a/drivers/base/power/sysfs.c	2008-01-04 16:50:54.000000000 +0800
> +++ b/drivers/base/power/sysfs.c	2008-01-04 17:14:42.000000000 +0800
> @@ -49,7 +49,7 @@ wake_show(struct device * dev, struct de
>  {
>  	return sprintf(buf, "%s\n", device_can_wakeup(dev)
>  		? (device_may_wakeup(dev) ? enabled : disabled)
> -		: "");
> +		: "unsupported");
>  }
>  
>  static ssize_t
>
>

  parent reply	other threads:[~2008-01-04 16:31 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-04 10:10 Yi Yang
2008-01-04 11:48 ` Pavel Machek
2008-01-04 16:09   ` David Brownell
2008-01-04 16:38     ` Alan Stern
2008-01-04 16:52       ` Olivier Galibert
2008-01-04 17:20         ` Oliver Neukum
2008-01-07  2:00           ` Yi Yang
2008-01-07  1:55         ` Yi Yang
2008-01-07  3:49           ` David Brownell
2008-01-07  1:52       ` Yi Yang
2008-01-07  1:37     ` Yi Yang
2008-01-07  1:57       ` Rafael J. Wysocki
2008-01-07  2:05         ` Yi Yang
2008-01-07 16:46           ` Rafael J. Wysocki
2008-01-07  1:21   ` Yi Yang
2008-01-04 16:31 ` David Brownell [this message]
2008-01-07  1:51   ` Yi Yang
2008-01-22 23:05 ` [PATCH 2.6.24-rc8] cpufreq: fix obvious condition statement error Yi Yang
2008-01-28 23:14   ` [PATCH 2.6.24] x86: add sysfs interface for cpuid module Yi Yang
2008-01-29  8:44     ` Sam Ravnborg
2008-01-29 22:22       ` Yi Yang
2008-01-30  7:48         ` Sam Ravnborg
2008-01-29 15:51     ` H. Peter Anvin
2008-01-29 17:52       ` Yi Yang
2008-01-30  6:09         ` H. Peter Anvin
2008-01-29 21:56       ` Yi Yang
2008-01-30  7:17         ` H. Peter Anvin
2008-01-29 22:13           ` Yi Yang
2008-01-30  7:33             ` H. Peter Anvin
2008-01-29 23:41     ` [RFC PATCH 2.6.24] x86: add sysfs interface for cpuid module, try 2 Yi Yang
2008-01-30 17:35       ` H. Peter Anvin
2008-01-31  1:18       ` [PATCH 2.6.24] Add new string functions real_strtoul and change kernel params to use them Yi Yang
2008-01-31 17:03         ` Randy Dunlap
2008-01-31 16:30           ` Yi Yang
2008-02-01  2:47             ` Randy Dunlap
2008-01-31 22:11         ` [PATCH 2.6.24] Add new string functions strict_strto* and convert kernel params to use them, take 2 Yi Yang
2008-02-01  0:02           ` [PATCH 2.6.24] Add new string functions strict_strto* and convert kernel params to use them, take 3 Yi Yang
2008-02-01  7:36           ` [PATCH 2.6.24] Add new string functions strict_strto* and convert kernel params to use them, take 2 Andrew Morton
2008-02-01  7:39           ` Andrew Morton
2008-02-01  7:40           ` Andrew Morton
2008-02-01 16:31     ` [PATCH 2.6.24] x86: add sysfs interface for cpuid module dean gaudet
2008-02-01 17:56       ` H. Peter Anvin
2008-02-01 17:58         ` H. Peter Anvin
2008-02-14 23:44   ` [PATCH 2.6.25-rc1] cpufreq: fix cpufreq policy refcount imbalance Yi Yang
2008-02-14 23:48   ` Yi Yang
2008-02-15 15:52     ` [linux-pm] " Alan Stern
2008-02-15 18:24       ` Greg KH
2008-02-15 21:01     ` Greg KH
2008-02-25  0:46     ` [PATCH 2.6.25-rc3] cpuidle: fix cpuidle time and usage overflow Yi Yang
2008-02-25 10:15       ` Ingo Molnar
2008-02-25  1:10         ` Yi Yang
2008-03-26  4:46       ` Len Brown

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