From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 493334A0EF6; Fri, 25 Sep 2026 14:10:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.3 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790345458; cv=none; b=ZW1gzOpUYvilqx9UtYigWybJo7ivqsm0Xiuib96eqMA3oxeHwHCSPRRi0FSaD/Cme4BNmlwPHOpvql0/AxLM5J6NfbZTEUDxvxFeMD2RRDeHk/eNdjrhOhszdo/LdEfF5zbK/QKyFq+H3LwYECJIkEgqqnDr8qFdNJ5+QMc7srw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790345458; c=relaxed/simple; bh=mPOb5G1Qz/RmNykC0s7p7NQ24Lun83T2cohQt2hDKvA=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=eBo1hFxvGaYERo55+OzC3ete1tNA/R+/xjoOsZlaeAHiAohWzrhqyWvMh/qsH7SGue/QfARclZZ96PoNEC3gAnPx4IaT0ilF8P+nBUuxV3Ax4oYmDEPi5QY2hKhjzl/n3rPz/NTu0301E6RzXQvA0y0vhYb3OXFUHxKCLOmiy28= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=YDKHp4+A; arc=none smtp.client-ip=117.135.210.3 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="YDKHp4+A" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=eP pXmbo4ejp8460fe8NLuub/ALvk6mEPsOLd+XEHehc=; b=YDKHp4+AwrLSgskTIN qJLkong60tuAgtjwTEKKi9xnbLNYMYoj2Mx0KCWxLPkSlRmcCEvEOCuYC35fEVJY tj3iNjRaPvwnLI0gSQKLDLXGzYF+xF7dsIKB4wBH3P/MFBApYYbf7WBsWM0eeF1r f1LXQd3ESj5d0K+EzE9GwK950= Received: from pc.localdomain (unknown []) by gzga-smtp-mtada-g1-1 (Coremail) with SMTP id _____wDnL5zAgLZqpBIGAw--.274S2; Fri, 25 Sep 2026 22:10:09 +0800 (CST) From: Jiale Yao To: Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig=20=28The=20Capable=20Hub=29?= , Takashi Sakamoto , Siratul Islam , Maxwell Doose , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jiale Yao Subject: [PATCH] iio: imu: kmx61: reject duplicate event disable Date: Fri, 25 Sep 2026 22:10:05 +0800 Message-Id: <20260925141006.2255067-1-yaojiale02@163.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wDnL5zAgLZqpBIGAw--.274S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7Xr47urWrWw1rXw4kXF48Xrb_yoWkGwb_uw 4rZr97XF4DAr4kJ3W5Zr1fXFy8ta4j9F1vvF1IvFsaka47XFs3Gws5XrZ8AwsrWrWUtayk KrsrZr1FvwsxGjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRMJ5rUUUUUU== X-CM-SenderInfo: x1dryxhdohiji6rwjhhfrp/xtbCzQGY0mq2gMHPggAA3W 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. Signed-off-by: Jiale Yao --- drivers/iio/imu/kmx61.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c index c288437d53ea..a4962b88ef58 100644 --- a/drivers/iio/imu/kmx61.c +++ b/drivers/iio/imu/kmx61.c @@ -939,7 +939,7 @@ static int kmx61_write_event_config(struct iio_dev *indio_dev, struct kmx61_data *data = kmx61_get_data(indio_dev); int ret = 0; - if (state && data->ev_enable_state) + if (state == data->ev_enable_state) return 0; guard(mutex)(&data->lock); -- 2.34.1