From: Angelo Dureghello Date: Mon, 10 Feb 2025 16:10:57 +0000 (+0100) Subject: iio: adc: ad7606: protect register access X-Git-Tag: v6.14.9~269 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7fb29ee7f80cecfa26b8eba2025f9dae54d097b8;p=thirdparty%2Fkernel%2Fstable.git iio: adc: ad7606: protect register access [ 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 --- diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c index 0339e27f92c32..1c547e8d52ac0 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 = (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; @@ -873,7 +878,12 @@ 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];