From: Jonathan Cameron Jonathan.Cameron@huawei.com
[ Upstream commit f40a71ffec808e7e51848f63f0c0d3c32d65081b ]
To make code more readable, use a structure to express the channel layout and ensure the timestamp is 8 byte aligned.
Found during an audit of all calls of this function.
Fixes: 95c12bba51c3 ("iio: accel: Add buffer mode for Sensortek STK8312") Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Link: https://lore.kernel.org/r/20210501170121.512209-7-jic23@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/accel/stk8312.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/accel/stk8312.c b/drivers/iio/accel/stk8312.c index 3b59887a8581..7d24801e8aa7 100644 --- a/drivers/iio/accel/stk8312.c +++ b/drivers/iio/accel/stk8312.c @@ -103,7 +103,11 @@ struct stk8312_data { u8 mode; struct iio_trigger *dready_trig; bool dready_trigger_on; - s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */ + /* Ensure timestamp is naturally aligned */ + struct { + s8 chans[3]; + s64 timestamp __aligned(8); + } scan; };
static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL); @@ -438,7 +442,7 @@ static irqreturn_t stk8312_trigger_handler(int irq, void *p) ret = i2c_smbus_read_i2c_block_data(data->client, STK8312_REG_XOUT, STK8312_ALL_CHANNEL_SIZE, - data->buffer); + data->scan.chans); if (ret < STK8312_ALL_CHANNEL_SIZE) { dev_err(&data->client->dev, "register read failed\n"); mutex_unlock(&data->lock); @@ -452,12 +456,12 @@ static irqreturn_t stk8312_trigger_handler(int irq, void *p) mutex_unlock(&data->lock); goto err; } - data->buffer[i++] = ret; + data->scan.chans[i++] = ret; } } mutex_unlock(&data->lock);
- iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, pf->timestamp); err: iio_trigger_notify_done(indio_dev->trig);