Re: [PATCH] iio: imu: kmx61: reject duplicate event disable

[Jonathan Cameron]

On Fri, 25 Sep 2026 17:18:44 +0300
Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> wrote:

> On Fri, Sep 25, 2026 at 10:10:05PM +0800, Jiale Yao wrote:
> > The IIO core does not filter duplicate writes to the event enable
> > attribute. kmx61_write_event_config() already ignores repeated enable
> > requests, but a repeated disable request still calls
> > kmx61_set_power_state(data, false, KMX61_ACC), dropping a runtime PM
> > reference that was not acquired for this request. This can underflow the
> > runtime PM usage count and trigger a "Runtime PM usage count underflow"
> > warning.
> > 
> > Return early when the requested state already matches ev_enable_state.  
> 
> Same comments as per previous patches of the same topic.
> 
Fixes tag needed.