Re: [PATCH v3 18/18] media: atomisp: csi2-bridge: Add support for VCM I2C-client instantiation

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Hi,

On 7/6/23 14:42, Andy Shevchenko wrote:
> On Thu, Jul 06, 2023 at 02:31:14PM +0200, Hans de Goede wrote:
>> On 7/6/23 12:15, Andy Shevchenko wrote:
>>> On Wed, Jul 05, 2023 at 11:30:10PM +0200, Hans de Goede wrote:
> 
>>>> +	vcm_type = kstrdup(obj->string.pointer, GFP_KERNEL);
>>>
>>> Where is the counterpart kfree()?
>>
>> The vcm-type is stored in one of the generated sw-nodes and the ipu-bridge
>> code only creates those once and them leaves them in memory, even on
>> a rmmod. So this is deliberately leaked just like that the ipu_bridge
>> struct which contains all the swnode-s is deliberately leaked by
>> ipu-bridge.c
> 
> Should we worry about those leakages?

No this is by design because removing the swnodes while e.g. a sensor
driver might still be bound to the i2c-client is trouble-some and
the callers of ipu_bridge_init check if it has already run and then
skip calling it.

So after a rmmod + modprobe of the atomisp / ipu3-cio2 driver
ipu_bridge_init() will not get called a second time. Instead
the old swnodes (1) which are already set as secondary fwnodes for
the sensor and bridge devices are re-used.

Regards,

Hans


1) + the properties they contain




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