Re: [PATCH 2/4] drm/bridge: display-connector: Fix I2C adapter resource leak

["Luca Ceresoli" <luca.ceresoli@bootlin.com>]

On Fri Jul 17, 2026 at 5:03 PM CEST, Johan Hovold wrote:
> On Mon, Jul 06, 2026 at 12:35:40AM +0300, Laurent Pinchart wrote:
>> If the probe function returns an error after getting the I2C adapter for
>> DDC, the reference to the adapter is never released. Fix it by releasing
>> it in the bridge .destroy() handler.
>>
>> There is no need to test the ddc pointer with !IS_ERR(), as
>> of_get_i2c_adapter_by_node() returns NULL on error.
>
> I stumbled over this this morning as well and posted a fix here (which
> releases the adapter on driver unbind as is currently done):
>
> 	https://lore.kernel.org/lkml/20260717085716.1619275-1-johan@kernel.org/
>
>> Fixes: 6de79dd3a920 ("drm/bridge: display-connector: add ddc-en gpio support")
>
> I believe this issue was first introduced by commit 2e2bf3a5584d
> ("drm/bridge: display-connector: add DP support") a few releases
> earlier.
>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>
> Reviewed-by: Johan Hovold <johan@kernel.org>

While Johan's patch has the benefit of putting the i2c adapter at remove
time (as opposed to destroy time, which is potentially a long time later),
it is also more complex. So I'd say this patch is fine.

Maybe we should have a devm version of of_get_i2c_adapter_by_node() to make
it all simpler.

Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

Luca

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