linux-kernel - Re: [PATCH 57/58] move w100fb's probe function to .devinit.text

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Date:	Sat, 28 Mar 2009 11:01:10 +0100
From:	pHilipp Zabel <philipp.zabel@...il.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ian Molton <spyro@....com>, Richard Purdie <rpurdie@...ys.net>,
	Antonino Daplas <adaplas@...il.com>,
	Alberto Mardegan <mardy@...rs.sourceforge.net>
Subject: Re: [PATCH 57/58] move w100fb's probe function to .devinit.text

2009/3/28 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>:
> A pointer to w100fb_probe is passed to the core via
> platform_driver_register and so the function must not disappear when the
> .init sections are discarded.  Otherwise (if also having HOTPLUG=y)
> unbinding and binding a device to the driver via sysfs will result in an
> oops as does a device being registered late.
>
> An alternative to this patch is using platform_driver_probe instead of
> platform_driver_register plus removing the pointer to the probe function
> from the struct platform_driver.

The ATI Imageon chips handled by this driver are not hotpluggable,
I think the proposed alternative is the right way.
Also, shouldn't w100fb_init be moved from __devinit to __init and
w100fb_remove be put into __exit?

> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Cc: Philipp Zabel <philipp.zabel@...il.com>
> Cc: Ian Molton <spyro@....com>
> Cc: Richard Purdie <rpurdie@...ys.net>
> Cc: Antonino Daplas <adaplas@...il.com>
> Cc: Alberto Mardegan <mardy@...rs.sourceforge.net>
> Cc: Andrew Morton <akpm@...ux-foundation.org>

---
 drivers/video/w100fb.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/video/w100fb.c b/drivers/video/w100fb.c
index d0674f1..157e7bd 100644
--- a/drivers/video/w100fb.c
+++ b/drivers/video/w100fb.c
@@ -781,7 +781,7 @@ out:
 }


-static int w100fb_remove(struct platform_device *pdev)
+static int __exit w100fb_remove(struct platform_device *pdev)
 {
 	struct fb_info *info = platform_get_drvdata(pdev);
 	struct w100fb_par *par=info->par;
@@ -1609,8 +1609,7 @@ static void w100_vsync(void)
 }

 static struct platform_driver w100fb_driver = {
-	.probe		= w100fb_probe,
-	.remove		= w100fb_remove,
+	.remove		= __exit_p(w100fb_remove),
 	.suspend	= w100fb_suspend,
 	.resume		= w100fb_resume,
 	.driver		= {
@@ -1618,9 +1617,9 @@ static struct platform_driver w100fb_driver = {
 	},
 };

-int __devinit w100fb_init(void)
+int __init w100fb_init(void)
 {
-	return platform_driver_register(&w100fb_driver);
+	return platform_driver_probe(&w100fb_driver, w100fb_probe);
 }

 void __exit w100fb_cleanup(void)
-- 
1.6.2.1
--
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