From: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
To: Mark Brown
<broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
Cc: Wolfram Sang <w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Samuel Ortiz <sameo-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Subject: Re: [PATCH 13/24] mfd: fix dangling pointers
Date: Sat, 20 Mar 2010 21:25:01 +0100 [thread overview]
Message-ID: <20100320212501.138b1644@hyperion.delvare> (raw)
In-Reply-To: <20100320172241.GD1549-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
On Sat, 20 Mar 2010 17:22:41 +0000, Mark Brown wrote:
> On Sat, Mar 20, 2010 at 03:12:54PM +0100, Wolfram Sang wrote:
> > Fix I2C-drivers which missed setting clientdata to NULL before freeing the
> > structure it points to. Also fix drivers which do this _after_ the structure
> > was freed already.
>
> Acked-by: Mark Brown <broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
>
> but it really does seem like this is something that the I2C core ought
> to handle - the assignment to null is boiler plate code that's getting
> added to the overwhelming majority of I2C devices in their teardown
> path, it'd seem a lot more sensible for the core to just trash driver
> data after the driver is unbound if it's important that this happens.
This is an interesting point. Do you know of any other subsystem doing
this? The core touching private data seems wrong to me, but I have to
agree that it would avoid a lot of duplication across drivers.
Can someone find a reasonable use case for client data surviving the
driver's .remove() call?
--
Jean Delvare
next prev parent reply other threads:[~2010-03-20 20:25 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-20 14:12 i2c-drivers: Remove dangling pointers Wolfram Sang
[not found] ` <1269094385-16114-1-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-20 14:12 ` [PATCH 01/24] mtd/maps/pismo: remove dangling pointer and a leak Wolfram Sang
[not found] ` <1269094385-16114-2-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-20 14:57 ` Russell King
[not found] ` <20100320145729.GA5399-f404yB8NqCZvn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2010-03-20 15:31 ` Wolfram Sang
[not found] ` <20100320153146.GB5515-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-20 15:41 ` Russell King
[not found] ` <20100320154113.GB14470-f404yB8NqCZvn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2010-03-21 8:30 ` David Woodhouse
2010-03-30 12:26 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 02/24] power/ds2782: really clear i2c_clientdata on exit Wolfram Sang
[not found] ` <1269094385-16114-3-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-20 21:53 ` Ryan Mallon
2010-03-22 17:08 ` Anton Vorontsov
[not found] ` <20100322170810.GA30325-wnGakbxT3iijyJ0x5qLZdcN33GVbZNy3@public.gmane.org>
2010-03-30 12:28 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 03/24] usb/otg/isp1301_omap: Fix dangling pointer Wolfram Sang
[not found] ` <1269094385-16114-4-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-20 20:09 ` Felipe Balbi
2010-03-30 12:30 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 05/24] hwmon: fix dangling pointers Wolfram Sang
[not found] ` <1269094385-16114-6-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-29 14:30 ` Jean Delvare
2010-03-20 14:12 ` [PATCH 07/24] input/touchscreen: " Wolfram Sang
2010-03-20 14:12 ` [PATCH 11/24] media/radio/si470x: " Wolfram Sang
2010-03-20 14:12 ` [PATCH 16/24] power: " Wolfram Sang
2010-03-20 14:12 ` [PATCH 17/24] regulator: " Wolfram Sang
[not found] ` <1269094385-16114-18-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-20 17:23 ` Mark Brown
2010-03-22 19:49 ` Liam Girdwood
2010-03-30 12:47 ` Wolfram Sang
2010-03-20 14:13 ` [PATCH 19/24] staging/dream: " Wolfram Sang
2010-03-20 14:13 ` [PATCH 22/24] staging/iio/light: " Wolfram Sang
2010-03-22 12:41 ` Jonathan Cameron
2010-04-05 22:59 ` i2c-drivers: Remove " Ben Dooks
[not found] ` <20100405225925.GC32401-elnMNo+KYs3pIgCt6eIbzw@public.gmane.org>
2010-04-06 0:06 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 04/24] gpio: fix " Wolfram Sang
[not found] ` <1269094385-16114-5-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-30 12:31 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 06/24] input/keyboard: " Wolfram Sang
2010-03-20 19:20 ` Dmitry Torokhov
[not found] ` <20100320192007.GA28402-WlK9ik9hQGAhIp7JRqBPierSzoNAToWh@public.gmane.org>
2010-03-21 1:59 ` Wolfram Sang
2010-03-30 12:35 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 08/24] leds: " Wolfram Sang
[not found] ` <1269094385-16114-9-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-30 12:36 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 09/24] macintosh: " Wolfram Sang
2010-03-20 14:12 ` [PATCH 10/24] media/radio: " Wolfram Sang
2010-03-20 14:12 ` [PATCH 12/24] media/video: " Wolfram Sang
2010-03-20 22:02 ` Hans Verkuil
[not found] ` <201003202302.49526.hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>
2010-03-21 11:31 ` Wolfram Sang
2010-03-21 13:46 ` Jean Delvare
[not found] ` <20100321144655.4747fd2a-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-03-21 14:14 ` Mark Brown
2010-03-21 16:09 ` Hans Verkuil
[not found] ` <201003211709.56319.hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org>
2010-03-22 20:33 ` Jean Delvare
2010-03-22 21:51 ` Mark Brown
2010-03-23 0:35 ` Wolfram Sang
2010-03-30 12:39 ` Wolfram Sang
2010-04-01 8:32 ` Hans Verkuil
2010-03-22 20:36 ` Jean Delvare
2010-03-20 14:12 ` [PATCH 13/24] mfd: " Wolfram Sang
2010-03-20 17:22 ` Mark Brown
[not found] ` <20100320172241.GD1549-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
2010-03-20 20:25 ` Jean Delvare [this message]
2010-03-21 2:09 ` Wolfram Sang
[not found] ` <1269094385-16114-14-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-25 10:41 ` Samuel Ortiz
[not found] ` <20100325104137.GA3720-jcdQHdrhKHMdnm+yROfE0A@public.gmane.org>
2010-03-30 12:41 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 14/24] misc: " Wolfram Sang
[not found] ` <1269094385-16114-15-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-30 12:44 ` Wolfram Sang
2010-03-20 14:12 ` [PATCH 15/24] misc/eeprom: " Wolfram Sang
2010-03-20 14:12 ` [PATCH 18/24] rtc: " Wolfram Sang
[not found] ` <1269094385-16114-19-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-30 12:49 ` Wolfram Sang
2010-03-20 14:13 ` [PATCH 20/24] staging/go7007: " Wolfram Sang
2010-03-20 14:13 ` [PATCH 21/24] staging/iio/adc: " Wolfram Sang
[not found] ` <1269094385-16114-22-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-22 12:41 ` Jonathan Cameron
2010-03-20 14:13 ` [PATCH 23/24] video/matrox: " Wolfram Sang
[not found] ` <1269094385-16114-24-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-04-05 14:04 ` James Simmons
2010-03-20 14:13 ` [PATCH 24/24] w1/masters: " Wolfram Sang
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