Re: [PATCH 1/6] ASoC: wm8962: Fix regulator notifier and beep leaks on card re-bind

[Charles Keepax <ckeepax@opensource.cirrus.com>]

On Sun, Sep 13, 2026 at 07:15:26PM +0900, Chancel Liu wrote:
> From: Chancel Liu <chancel.liu@nxp.com>
> 
> wm8962 registers its regulator disable notifiers and allocates its beep
> input device from the ASoC component probe, but the associated devres
> cleanup is tied to the underlying I2C device.
> 
> These resources are only leaked when the sound card is unregistered and
> re-registered while the I2C device stays bound. On that path the
> component probe runs again and:
> 
> - re-registers the same notifier_block on the still-registered
>   regulator notifier chain, which triggers
> 
>     notifier callback wm8962_regulator_event_N already registered
>     WARNING: ... at kernel/notifier.c:23 notifier_chain_register
> 
>   and corrupts the chain.
> 
> - allocates and registers a new beep input device every time while
>   wm8962_free_beep() only clears the pointer, leaking the previous
>   input device and its sysfs/input node.
> 
> Fix both:
> - Move the regulator notifier registration to wm8962_i2c_probe() so it
>   runs once per I2C device bind.
> 
> - Allocate the beep device with input_allocate_device() and pair it
>   with the component lifecycle: input_free_device() on registration
>   failure and input_unregister_device() in wm8962_free_beep().
> 
> Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
> ---

Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>

Thanks,
Charles