Re: [PATCH v2 0/8] HID: iio: Avoid race between callback setup and device exposure

[Andy Shevchenko]

On Mon, Jun 22, 2026 at 10:59:56AM +0530, Sanjay Chitroda wrote:
> 
> This series avoid a race condition in HID IIO drivers related to the
> ordering between callback registration and device exposure.
> 
> Currently, several HID IIO drivers register the IIO device (making it
> visible to userspace and other kernel consumers) before all required
> callbacks and resources are fully initialized, or rely on devm-based
> cleanup in a way that does not guarantee correct teardown ordering.
> This creates a window where the device can be accessed while it is

There is a difference between "this creates" and "this might create".
I believe Srinivas and others were asking for the proof. So, what path
in the code makes this happen or possible to happen?

> not fully initialized or is being torn down, potentially leading to
> sample drop or stale/no data.
> 
> To handle this, the series ensures that:
>   - All required callbacks and resources are set up before the device
>     is registered with the IIO core
>   - Resource cleanup is performed explicitly where ordering matters
> 
> PS: This is prepratory series to convert all HID IIO driver to devm.
> 
> Testing:
>   - Compiled with W=1 for each patch in series
> 
> ---
> Changes in v2:
> - Drop fixes tag and rectify commit message with reference to that

You also dropped my tag. Why?

> - Link to v1: https://patch.msgid.link/20260606-5-june-hid-iio-race-fixes-v1-0-27a848c5758f@xxxxxxxxx

-- 
With Best Regards,
Andy Shevchenko