From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.3]) (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 64FE147F2ED; Fri, 25 Sep 2026 14:10:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.3 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790345429; cv=none; b=CTOOQkJ44x6BDZLcgOyZ/cF5aA+Nh8SzJKe0xebPcfMSuwYCO0+P3nqU6LxR52IvmCA+fv8IhVsbdGl/jb/y6l2bnYuytllo79QRo8zRRBNitsYpLSXvwD67qLerbpP0scudmk0Mb38anLN5i/G7jtelNKJIjYOI/SK+GjxI54k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790345429; c=relaxed/simple; bh=R6OsoQAgACwDXHCXZ1qOWZpkly8HwuUopgWg55ZCMAQ=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=Ht1SS6Pd3/Tx8miWKk1tqGrnxx74Nbhp4kzOtav2NJ7Rye3ZRGSpwEvStKWrV8osRVdDqRxArKxlVHGuRXALgwNWrdAZTMzbyIbSiou5U3hrKDfkblLXocbZMo/ADxMmYOUJbY3GGwG+qzUicFz/VsKN8BctcEhhSy+ORFWOzyk= 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=QrtfAlSD; arc=none smtp.client-ip=220.197.31.3 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="QrtfAlSD" 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=Oj sg9coUeg20a1JfumNQ4V+6/v/2+gOQyztI8wP6O7c=; b=QrtfAlSD0H5Xxg1/sl jYlRZeEqGkK9Z6RPN4L/tgA3x/aIZ0NKlwMu/UOeM69XmNx+dhy104m5L+zHX5nk N/cKAaldB17R/Yqg5onuxGDH8MxKDqRCHTXgnV/X+bgEutXzivzOHFYdOnzhp0hu kj2tvwcJHGIvrCQWUvqE1Fefg= Received: from pc.localdomain (unknown []) by gzga-smtp-mtada-g0-3 (Coremail) with SMTP id _____wD3X0i1gLZqfBMiAw--.479S2; Fri, 25 Sep 2026 22:09:58 +0800 (CST) From: Jiale Yao To: Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Stepan Ionichev , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jiale Yao Subject: [PATCH] iio: gyro: bmg160: reject duplicate event disable Date: Fri, 25 Sep 2026 22:09:54 +0800 Message-Id: <20260925140956.2254877-1-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:_____wD3X0i1gLZqfBMiAw--.479S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7Jr18WF43Ar13KF4fKFyfWFg_yoWkWwbE9w 18Z397WrZxZr17J3W5Xr4fXrykta4DuF9Yga1xtrsxA3srJF93GwsYqrZrCanrXrW7ta4U tr47X3WFq3Z3KjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRtUDGUUUUUU== X-CM-SenderInfo: x1dryxhdohiji6rwjhhfrp/xtbCzhaVz2q2gLbkjAAA3A The IIO core does not filter duplicate writes to the event enable attribute. bmg160_write_event_config() already ignores repeated enable requests, but a repeated disable request still calls bmg160_set_power_state(data, false), 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/gyro/bmg160_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iio/gyro/bmg160_core.c b/drivers/iio/gyro/bmg160_core.c index d611341a0e2a..0b5621455216 100644 --- a/drivers/iio/gyro/bmg160_core.c +++ b/drivers/iio/gyro/bmg160_core.c @@ -761,7 +761,7 @@ static int bmg160_write_event_config(struct iio_dev *indio_dev, struct bmg160_data *data = iio_priv(indio_dev); int ret; - if (state && data->ev_enable_state) + if (state == data->ev_enable_state) return 0; mutex_lock(&data->mutex); -- 2.34.1