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    Subject[PATCH 4.19 181/421] iio: light: isl29125: Fix buffer alignment in iio_push_to_buffers_with_timestamp()
    Date
    From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

    [ Upstream commit 3d4725194de6935dba2ad7c9cc075c885008f747 ]

    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 uses of
    iio_push_to_buffers_with_timestamp()

    Fixes: 6c25539cbc46 ("iio: Add Intersil isl29125 digital color light sensor driver")
    Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
    Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
    Link: https://lore.kernel.org/r/20210501170121.512209-18-jic23@kernel.org
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/iio/light/isl29125.c | 10 +++++++---
    1 file changed, 7 insertions(+), 3 deletions(-)

    diff --git a/drivers/iio/light/isl29125.c b/drivers/iio/light/isl29125.c
    index ed38edcd5efe..d0f5fd42c0ec 100644
    --- a/drivers/iio/light/isl29125.c
    +++ b/drivers/iio/light/isl29125.c
    @@ -54,7 +54,11 @@
    struct isl29125_data {
    struct i2c_client *client;
    u8 conf1;
    - u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
    + /* Ensure timestamp is naturally aligned */
    + struct {
    + u16 chans[3];
    + s64 timestamp __aligned(8);
    + } scan;
    };

    #define ISL29125_CHANNEL(_color, _si) { \
    @@ -187,10 +191,10 @@ static irqreturn_t isl29125_trigger_handler(int irq, void *p)
    if (ret < 0)
    goto done;

    - data->buffer[j++] = ret;
    + data->scan.chans[j++] = ret;
    }

    - iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
    + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
    iio_get_time_ns(indio_dev));

    done:
    --
    2.30.2


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