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Sat, 14 Mar 2026 16:14:01 -0700 (PDT) From: David Lechner Date: Sat, 14 Mar 2026 18:13:32 -0500 Subject: [PATCH 2/2] iio: adc: ti-adc161s626: use DMA-safe memory for spi_read() 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: <20260314-iio-adc-ti-adc161s626-fix-scan-buf-v1-2-56243b11e87b@baylibre.com> References: <20260314-iio-adc-ti-adc161s626-fix-scan-buf-v1-0-56243b11e87b@baylibre.com> In-Reply-To: <20260314-iio-adc-ti-adc161s626-fix-scan-buf-v1-0-56243b11e87b@baylibre.com> To: Jonathan Cameron , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Matt Ranostay Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, David Lechner X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1601; i=dlechner@baylibre.com; h=from:subject:message-id; bh=uP34d8adAjWGrdnFDt+v8AQuj1fzjsUbW7G1AbYMsxA=; b=owEBbQGS/pANAwAKAcLMIAH/AY/AAcsmYgBpteusVJtgDQCQIDid8LlVNKH/MoA5pI8xIdHgC zpGg7rGVgmJATMEAAEKAB0WIQTsGNmeYg6D1pzYaJjCzCAB/wGPwAUCabXrrAAKCRDCzCAB/wGP wIu+B/9+iJlIPsEYIRGc5OzspV4dEONYNmFkQud1CRy9UPaPClUDSqfSclH8ZHst2aqOKFKmTND ztzALp2GYBJzfGZtHhcPmAb1WZC2/aUsBJ1qO3WEbd+zkDBPQsZfaF6H3YM1lWwk9jEteDBpIlK mtWuk8EmLgXdlklNf/yvBn9XIl8LSoKW84wnC8YufQhOLDFjADY4LZC+fCNembIkzx1Z7t99qkB 6D8EnVkWp5VYYUtMy2SPaBtASAwIT3slRzMrd2pcFOF+NERRgD9YFsTNDGFO5bGHreSJ4xHOqCO euAhcws675ciPlvdN6PTJFEUeHJrLV+RntX1CGv9K3Bt1eUH X-Developer-Key: i=dlechner@baylibre.com; a=openpgp; fpr=8A73D82A6A1F509907F373881F8AF88C82F77C03 Add a DMA-safe buffer and use it for spi_read() instead of a stack memory. All SPI buffers must be DMA-safe. Since we only need up to 3 bytes, we just use a u8[] instead of __be16 and __be32 and change the conversion functions appropriately. Fixes: 4d671b71beef ("iio: adc: ti-adc161s626: add support for TI 1-channel= differential ADCs") Signed-off-by: David Lechner Reviewed-by: Andy Shevchenko --- drivers/iio/adc/ti-adc161s626.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/drivers/iio/adc/ti-adc161s626.c b/drivers/iio/adc/ti-adc161s62= 6.c index 1d427548e0b3..6416d6a7ada0 100644 --- a/drivers/iio/adc/ti-adc161s626.c +++ b/drivers/iio/adc/ti-adc161s626.c @@ -70,6 +70,7 @@ struct ti_adc_data { =20 u8 read_size; u8 shift; + u8 buf[3] __aligned(IIO_DMA_MINALIGN); }; =20 static int ti_adc_read_measurement(struct ti_adc_data *data, @@ -78,26 +79,20 @@ static int ti_adc_read_measurement(struct ti_adc_data *= data, int ret; =20 switch (data->read_size) { - case 2: { - __be16 buf; - - ret =3D spi_read(data->spi, (void *) &buf, 2); + case 2: + ret =3D spi_read(data->spi, data->buf, 2); if (ret) return ret; =20 - *val =3D be16_to_cpu(buf); + *val =3D get_unaligned_be16(data->buf); break; - } - case 3: { - __be32 buf; - - ret =3D spi_read(data->spi, (void *) &buf, 3); + case 3: + ret =3D spi_read(data->spi, data->buf, 3); if (ret) return ret; =20 - *val =3D be32_to_cpu(buf) >> 8; + *val =3D get_unaligned_be24(data->buf); break; - } default: return -EINVAL; } --=20 2.43.0