linux-kernel - Re: [PATCH v2 1/3] i2c: atr: Fix client detach

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Message-ID: <20241126091441.345d4493@booty>
Date: Tue, 26 Nov 2024 09:14:41 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Sakari Ailus
 <sakari.ailus@...ux.intel.com>, linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org, Wolfram Sang <wsa@...nel.org>, Mauro Carvalho
 Chehab <mchehab@...nel.org>, Cosmin Tanislav <demonsingur@...il.com>, Tomi
 Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
 stable@...r.kernel.org, Romain Gantois <romain.gantois@...tlin.com>
Subject: Re: [PATCH v2 1/3] i2c: atr: Fix client detach

Hello Tomi,

+Cc: Romain who is doing a different kind of sorcery on i2c-atr.c, so
he is aware of this series.

On Fri, 22 Nov 2024 14:26:18 +0200
Tomi Valkeinen <tomi.valkeinen@...asonboard.com> wrote:

> From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> 
> i2c-atr catches the BUS_NOTIFY_DEL_DEVICE event on the bus and removes
> the translation by calling i2c_atr_detach_client().
> 
> However, BUS_NOTIFY_DEL_DEVICE happens when the device is about to be
> removed from this bus, i.e. before removal, and thus before calling
> .remove() on the driver. If the driver happens to do any i2c
> transactions in its remove(), they will fail.
> 
> Fix this by catching BUS_NOTIFY_REMOVED_DEVICE instead, thus removing
> the translation only after the device is actually removed.
> 
> Fixes: a076a860acae ("media: i2c: add I2C Address Translator (ATR) support")
> Cc: stable@...r.kernel.org
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>

Looks good:
Reviewed-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com