From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean Delvare Subject: Re: [PATCH] drivers/mfd: remove unneeded and dangerous clearing of clientdata Date: Tue, 18 May 2010 19:31:15 +0200 Message-ID: <20100518193115.62bb6b4e@hyperion.delvare> References: <1274098229-13858-1-git-send-email-w.sang@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1274098229-13858-1-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Wolfram Sang Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Samuel Ortiz , stable-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org List-Id: linux-i2c@vger.kernel.org On Mon, 17 May 2010 14:10:29 +0200, Wolfram Sang wrote: > 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 > Cc: Jean Delvare > Cc: Samuel Ortiz > Cc: stable-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org Acked-by: Jean Delvare > --- > > Note: While most of the other calls clearing clientdata became superfluous > meanwhile and will be fixed later to remove redundancy, this is a seperate > issue. It was wrong from the beginning and needs to be fixed as it can cause > crashes. Hopefully, during this release-cycle, all other clearings of > clientdata will be removed and we will never see the related confusion again. > > drivers/mfd/88pm860x-i2c.c | 1 - > drivers/mfd/max8925-i2c.c | 2 -- > 2 files changed, 0 insertions(+), 3 deletions(-) > > diff --git a/drivers/mfd/88pm860x-i2c.c b/drivers/mfd/88pm860x-i2c.c > index 4a6e718..e55f3d2 100644 > --- a/drivers/mfd/88pm860x-i2c.c > +++ b/drivers/mfd/88pm860x-i2c.c > @@ -200,7 +200,6 @@ static int __devexit pm860x_remove(struct i2c_client *client) > > 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; > diff --git a/drivers/mfd/max8925-i2c.c b/drivers/mfd/max8925-i2c.c > index d9fd878..e73f3f5 100644 > --- a/drivers/mfd/max8925-i2c.c > +++ b/drivers/mfd/max8925-i2c.c > @@ -173,8 +173,6 @@ static int __devexit max8925_remove(struct i2c_client *client) > 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; -- Jean Delvare