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iio: adc: ti-ads1015: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

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[ Upstream commit d85d71dd1ab67eaa7351f69fec512d8f09d164e1 ]

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: ecc24e72f437 ("iio: adc: Add TI ADS1015 ADC driver support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Daniel Baluta <daniel.baluta@nxp.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210501170121.512209-9-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonathan Cameron 2021-05-01 18:01:10 +01:00 committed by Greg Kroah-Hartman
parent 354558d25a
commit ce2f42f6b6
1 changed files with 8 additions and 4 deletions
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12
drivers/iio/adc/ti-ads1015.c
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@ -392,10 +392,14 @@ static irqreturn_t ads1015_trigger_handler(int irq, void *p)
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct ads1015_data *data = iio_priv(indio_dev);
s16 buf[8]; /* 1x s16 ADC val + 3x s16 padding + 4x s16 timestamp */
/* Ensure natural alignment of timestamp */
struct {
s16 chan;
s64 timestamp __aligned(8);
} scan;
int chan, ret, res;
memset(buf, 0, sizeof(buf));
memset(&scan, 0, sizeof(scan));
mutex_lock(&data->lock);
chan = find_first_bit(indio_dev->active_scan_mask,
@ -406,10 +410,10 @@ static irqreturn_t ads1015_trigger_handler(int irq, void *p)
goto err;
}
buf[0] = res;
scan.chan = res;
mutex_unlock(&data->lock);
iio_push_to_buffers_with_timestamp(indio_dev, buf,
iio_push_to_buffers_with_timestamp(indio_dev, &scan,
iio_get_time_ns(indio_dev));
err: