linux-kernel - Re: Changes to sysfs PM layer break userspace

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Message-Id: <200612191929.14524.david-b@pacbell.net>
Date:	Tue, 19 Dec 2006 19:29:13 -0800
From:	David Brownell <david-b@...bell.net>
To:	Andrew Morton <akpm@...l.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: Changes to sysfs PM layer break userspace

On Tuesday 19 December 2006 6:15 pm, Andrew Morton wrote:
> On Tue, 19 Dec 2006 13:34:49 -0800
> David Brownell <david-b@...bell.net> wrote:
> 
> > Documentation/feature-removal-schedule.txt has warned about this since
> > August
> 
> Nobody reads that.
> 
> Please, wherever possible, put a nice printk("this is going away") in the code
> when planning these things.


Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>

Index: g26/drivers/base/power/sysfs.c
===================================================================
--- g26.orig/drivers/base/power/sysfs.c	2006-09-27 16:19:00.000000000 -0700
+++ g26/drivers/base/power/sysfs.c	2006-12-19 19:27:25.000000000 -0800
@@ -42,9 +42,17 @@ static ssize_t state_show(struct device 
 
 static ssize_t state_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t n)
 {
+	static int warned;
 	pm_message_t state;
 	int error = -EINVAL;
 
+	if (!warned) {
+		printk(KERN_WARNING
+			"*** WARNING *** sysfs devices/.../power/state files "
+			"are only for testing, and will be removed\n");
+		warned = error;
+	}
+
 	/* disallow incomplete suspend sequences */
 	if (dev->bus && (dev->bus->suspend_late || dev->bus->resume_early))
 		return error;
-
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