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Date: Sun, 27 Sep 2026 18:20:31 +0100
From: Jonathan Cameron <jic23@kernel.org>
To: Andy Shevchenko <andriy.shevchenko@intel.com>
Cc: Jiale Yao <yaojiale02@163.com>, David Lechner <dlechner@baylibre.com>,
 Nuno =?UTF-8?B?U8Oh?= <nuno.sa@analog.com>, Andy Shevchenko
 <andy@kernel.org>, "Uwe =?UTF-8?B?S2xlaW5lLUvDtm5pZw==?= (The Capable Hub)"
 <u.kleine-koenig@baylibre.com>, Takashi Sakamoto <o-takashi@sakamocchi.jp>,
 Siratul Islam <email@sirat.me>, Maxwell Doose <maxwell@maxwelld.cc>,
 linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] iio: imu: kmx61: reject duplicate event disable
Message-ID: <20260927182031.6d490331@jic23-hlaptop>
In-Reply-To: <araCxIGnZK0zuUSS@ashevche-desk.local>
References: <20260925141006.2255067-1-yaojiale02@163.com>
	<araCxIGnZK0zuUSS@ashevche-desk.local>
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On Fri, 25 Sep 2026 17:18:44 +0300
Andy Shevchenko <andriy.shevchenko@intel.com> 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.