From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 205663272D6; Mon, 5 May 2025 22:34:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746484484; cv=none; b=ORbKFTQ1il0GWTzRXSflAQnc5YVhd84IVSmdNjaPyqVlCap6NoKFf5uxwN1YQP4e8uc21P3spcLMgf39N4CW/ZJmCvxctepw/P00Q2T2lgnalrNbjLo/pr1da/lsuPTA6fEtRGo5C4bFpLOj0+aAfsxzKkrEv2NJ3qgL4S08E0Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746484484; c=relaxed/simple; bh=y4du74TKn+X96QeimtPntdcuAS8xlZ9guu7x0q8AqmA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Xptw/cphfUdq2LXI7Lx31jqwoYM4xMMx4lJ7JukZcQxetI4fs5ZMYtJTCgp9gs5Ge5YfEv+///sp8aS3uLX5fIK6FmJcDdPg2rquhWgs0wUzLBAxpdl3HRLNDvIefuY306q7BznRNLr0TqP3iAk/U+YHnEAKT1NUjyukGDIgLgs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=niM801Kn; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="niM801Kn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E87F2C4CEF2; Mon, 5 May 2025 22:34:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746484484; bh=y4du74TKn+X96QeimtPntdcuAS8xlZ9guu7x0q8AqmA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=niM801Kn28TE2aSEKtRGHxOUObxGnF7iVPRKtzHT+L5zZf+a3JAWqg5DHhTMK/XBF Vd6ZEb3VGXDspa8dfPf+FqZrcFw/tmi/6bAQSG2xRX+qV6+kWFFPRq5JEbfZ4MTXFH m6gM2AqY7tjSgXN8Oru2AXzJryDyHyuRvwPnIuHf/Kh0UtLqDrxVQuk7BGba9LUTjF 3VduyqzYw75hNcCJyl39Ov+OBWg7FgZdJb7nK3y+mBvHDp86ESRrdLb+kMOt586OPi WxzUSuEBJFZb5Q2nWX/Lnsal3mx6gJE+n+0NG7oXebXXM0zZZWMhXcqZzcDnB8lrlU mIZylBk+xuLbg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Angelo Dureghello , Jonathan Cameron , Sasha Levin , lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org, linux-iio@vger.kernel.org Subject: [PATCH AUTOSEL 6.14 493/642] iio: adc: ad7606: protect register access Date: Mon, 5 May 2025 18:11:49 -0400 Message-Id: <20250505221419.2672473-493-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505221419.2672473-1-sashal@kernel.org> References: <20250505221419.2672473-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.14.5 Content-Transfer-Encoding: 8bit From: Angelo Dureghello [ Upstream commit 0f65f59e632d942cccffd12c36036c24eb7037eb ] Protect register (and bus) access from concurrent read / write. Needed in the backend operating mode. Signed-off-by: Angelo Dureghello Link: https://patch.msgid.link/20250210-wip-bl-ad7606_add_backend_sw_mode-v4-7-160df18b1da7@baylibre.com Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- 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 d39354afd5394..2b0725449a6ab 100644 --- a/drivers/iio/adc/ad7606.c +++ b/drivers/iio/adc/ad7606.c @@ -852,7 +852,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, } val = (val * MICRO) + val2; i = find_closest(val, scale_avail_uv, cs->num_scales); + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret < 0) + return ret; ret = st->write_scale(indio_dev, ch, i + cs->reg_offset); + iio_device_release_direct_mode(indio_dev); if (ret < 0) return ret; cs->range = i; @@ -863,7 +868,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, return -EINVAL; i = find_closest(val, st->oversampling_avail, st->num_os_ratios); + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret < 0) + return ret; ret = st->write_os(indio_dev, i); + iio_device_release_direct_mode(indio_dev); if (ret < 0) return ret; st->oversampling = st->oversampling_avail[i]; -- 2.39.5