From nobody Thu Dec 18 01:40:29 2025 Received: from mail-wr1-f48.google.com (mail-wr1-f48.google.com [209.85.221.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B99B1F4613 for ; Mon, 10 Feb 2025 16:12:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739203981; cv=none; b=SD7l7l+i7gs8eUAg+pjHNGANhXQTkkCp3ph8SLO10OcbtdHyaVGdRC9VluNiwHIVtG2vZoZPT2J+jhqQ/w3KDkG2/3N0fsng0VMBULICRBvJ3n6pnpn3OP4PT76Ek40KOF4UrNmEqtaapcssTMq2s0YvurgVi1i45kP5/TBxILU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739203981; c=relaxed/simple; bh=EYN2jmjQpt0Relr6D6FUdK13M4l5zeXDuBWC3e77YUw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Lq+tArS2qgZUJfMdDuTuOq/13f0Imk+aGKhDxAiRrgflL346E9CG4cdEsQte+DjBsrM0OVc/Pg6PnzDQumB/xc7k1KJ7wRMlnTom9+0atMoAkkDGe2W97l8fh8QqHmHDyHahh462YRczOseiVtHiNmWbiuGhNsX/s5zIM5mahmg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com; spf=pass smtp.mailfrom=baylibre.com; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b=FPHLrmhX; arc=none smtp.client-ip=209.85.221.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=baylibre.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b="FPHLrmhX" Received: by mail-wr1-f48.google.com with SMTP id ffacd0b85a97d-38dd9b3419cso893117f8f.0 for ; Mon, 10 Feb 2025 08:12:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1739203977; x=1739808777; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=iIjPfuFGXuMmM5B5bh3vlcOXqvUxOsdFQdpkLRhWYHE=; b=FPHLrmhX4ts/LCgk7/x3bYH2HAsnyNptf+3hs4tl/l0O/vXV98N6bdaJEht7+q2MHd 3wv3vg7xXFzhXXQHV7y/pMariaIkHuHrQAlYbBXr9/uFmnIJlTyBw7hOLguJNEp555MS cq8woka8YhtXvjRiC+n2PPo3OhHyKy3EuFB2UnSZTkrZfmaIUKnQS8cX3Xe3P5JGVFju 3l6xIk6/c34RuOSrdbu1N51TKCxYrhSLz+elkzbExhfvWjax/zRQPt+Vs7pFXaixf0wD JG5KmNcKQyhAVDSbRGnkzNrA3+2b69hwxcDFdAusbkM67pmSjar7GnH8oqb/0oc/mvN0 NDCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739203977; x=1739808777; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=iIjPfuFGXuMmM5B5bh3vlcOXqvUxOsdFQdpkLRhWYHE=; b=k7EkJXzugHWgjKV9JDA0IZno0phMW0GR92eq8ZjTtzO37pdQQv5I53243PBjRzvwUI sSBChRPN6VvBGkkWI6MCJuGp5xzg0X33zIqT8S2KtDPaS+8toC0XWOpnj8NipBiZFdoj zfQjmPs3L29R7SXp1f6J66vGdkRVtJP6d/qpsCRamTx73Gjnr4KlRTvFPbZPMFXDSRvo UnyVTRoKdUjAbzSVt0F+8fT1yIFxkduy/oGJU5+5R6TZDqPQ4uZ/Jeu6SyID0kLDr4pT SOHofu9Ydose+bTJofXQquCupSvVZuzLQaeqh6ML03QidCUzkrL1SKhHJUSoX+fLPAm5 Nmfg== X-Forwarded-Encrypted: i=1; AJvYcCVQBRDxHmnC3963v2DRNSOY6pWvOhzKMloH9Cvsamv3dqDbK9jjc2iC8BMwftB1AKGLTzc31tbnIWkzWAo=@vger.kernel.org X-Gm-Message-State: AOJu0YzKKmbB1ykS6UujjstgYWBT5oBFUgrGateQRvG4iNuClcVrOQDm LpG78ATy0XGmDJUg6cDSp16JgYJrMy8qYGhlgPPkIkvVQ4gclvpWdARwozf1eOQ= X-Gm-Gg: ASbGnctj9QqoMwEHx6HzKjmsi5J6ZCvGEzKokBiZYVvhd7KupGDhxmQTzvZgYFhvK09 f+YxbGg00wAH76nodyLiiozQqYXERApkxWOKgLH/skcIaEZ1yZo1JgaqBHc6yAKkVd+6LSeW29q rge5l6Ug3cmTJ92oqr+vETVQ3js9Xq1ImiX+gBfV9xi2n9wSnUyUhFbhjftJF1f/15vNpxW2Rny b6e3iYzBP8JLBPBfo1m6LgAOwy/UL7gAWWksF0ssz8ogjYY28SKdp6mD2zUGrzdhT8kVk+EwJ3J rBh5Q/561dJ66nQmI55GBTGt6lq99ZaW0WdSmMsW9mDABOK1jDpQPvbZ298JDGg= X-Google-Smtp-Source: AGHT+IF8U4g+gzBJ/cIqcckdV7LgaRgLDwbSHf1t/ZRLRiATW6wIMx/g/+6UZw2NAefFPk2iWnxLJw== X-Received: by 2002:a05:6000:1787:b0:38d:ae82:e5ed with SMTP id ffacd0b85a97d-38de41c3d17mr166768f8f.51.1739203976810; Mon, 10 Feb 2025 08:12:56 -0800 (PST) Received: from [127.0.1.1] (host-87-8-15-130.retail.telecomitalia.it. [87.8.15.130]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4391dc9ffcdsm146637945e9.15.2025.02.10.08.12.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Feb 2025 08:12:56 -0800 (PST) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Date: Mon, 10 Feb 2025 17:10:57 +0100 Subject: [PATCH v4 7/9] iio: adc: ad7606: protect register access Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250210-wip-bl-ad7606_add_backend_sw_mode-v4-7-160df18b1da7@baylibre.com> References: <20250210-wip-bl-ad7606_add_backend_sw_mode-v4-0-160df18b1da7@baylibre.com> In-Reply-To: <20250210-wip-bl-ad7606_add_backend_sw_mode-v4-0-160df18b1da7@baylibre.com> To: Michael Hennerich , Lars-Peter Clausen , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexandru Ardelean , David Lechner Cc: Jonathan Cameron , linux-fbdev@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Guillaume Stols , Angelo Dureghello X-Mailer: b4 0.14.1 From: Angelo Dureghello Protect register (and bus) access from concurrent read / write. Needed in the backend operating mode. Signed-off-by: Angelo Dureghello --- drivers/iio/adc/ad7606.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c index 7985570ed152..07656fdd602e 100644 --- a/drivers/iio/adc/ad7606.c +++ b/drivers/iio/adc/ad7606.c @@ -862,7 +862,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, } val =3D (val * MICRO) + val2; i =3D find_closest(val, scale_avail_uv, cs->num_scales); + + ret =3D iio_device_claim_direct_mode(indio_dev); + if (ret < 0) + return ret; ret =3D st->write_scale(indio_dev, ch, i + cs->reg_offset); + iio_device_release_direct_mode(indio_dev); if (ret < 0) return ret; cs->range =3D i; @@ -873,7 +878,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, return -EINVAL; i =3D find_closest(val, st->oversampling_avail, st->num_os_ratios); + + ret =3D iio_device_claim_direct_mode(indio_dev); + if (ret < 0) + return ret; ret =3D st->write_os(indio_dev, i); + iio_device_release_direct_mode(indio_dev); if (ret < 0) return ret; st->oversampling =3D st->oversampling_avail[i]; --=20 2.47.0