linux-kernel - [170/205] mfd: Remove unneeded and dangerous clearing of clientdata

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Date:	Fri, 30 Jul 2010 10:53:07 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Wolfram Sang <w.sang@...gutronix.de>,
	Jean Delvare <khali@...ux-fr.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [170/205] mfd: Remove unneeded and dangerous clearing of clientdata

2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Wolfram Sang <w.sang@...gutronix.de>

commit 28ade0f217a3a3ff992b01e06e6e425c250a8406 upstream.

Unlike real i2c-devices which get detached from the driver, dummy-devices
get truly unregistered. So, there has never been a need to clear the
clientdata because the device will go away anyhow. For the occasions fixed
here, clearing clientdata was even dangerous as the structure was freed
already.

Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>
Acked-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/mfd/88pm860x-i2c.c |    1 -
 drivers/mfd/max8925-i2c.c  |    2 --
 2 files changed, 3 deletions(-)

--- a/drivers/mfd/88pm860x-i2c.c
+++ b/drivers/mfd/88pm860x-i2c.c
@@ -200,7 +200,6 @@ static int __devexit pm860x_remove(struc
 
 	pm860x_device_exit(chip);
 	i2c_unregister_device(chip->companion);
-	i2c_set_clientdata(chip->companion, NULL);
 	i2c_set_clientdata(chip->client, NULL);
 	kfree(chip);
 	return 0;
--- a/drivers/mfd/max8925-i2c.c
+++ b/drivers/mfd/max8925-i2c.c
@@ -173,8 +173,6 @@ static int __devexit max8925_remove(stru
 	max8925_device_exit(chip);
 	i2c_unregister_device(chip->adc);
 	i2c_unregister_device(chip->rtc);
-	i2c_set_clientdata(chip->adc, NULL);
-	i2c_set_clientdata(chip->rtc, NULL);
 	i2c_set_clientdata(chip->i2c, NULL);
 	kfree(chip);
 	return 0;


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