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Date: Mon, 19 Jul 2021 16:49:54 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jonathan Cameron <Jonathan.Cameron@...wei.com>, Andy Shevchenko <andy.shevchenko@...il.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.19 183/421] iio: light: tcs3472: Fix buffer alignment in iio_push_to_buffers_with_timestamp() From: Jonathan Cameron <Jonathan.Cameron@...wei.com> [ Upstream commit df2f37cffd6ed486d613e7ee22aadc8e49ae2dd3 ] 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 tag is not strictly accurate as prior to that patch there was potentially an unaligned write. However, any backport past there will need to be done manually. Fixes: 0624bf847dd0 ("iio:tcs3472: Use iio_push_to_buffers_with_timestamp()") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com> Link: https://lore.kernel.org/r/20210501170121.512209-20-jic23@kernel.org Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/iio/light/tcs3472.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/iio/light/tcs3472.c b/drivers/iio/light/tcs3472.c index 1995cc5cd732..82204414c7a1 100644 --- a/drivers/iio/light/tcs3472.c +++ b/drivers/iio/light/tcs3472.c @@ -67,7 +67,11 @@ struct tcs3472_data { u8 control; u8 atime; u8 apers; - u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */ + /* Ensure timestamp is naturally aligned */ + struct { + u16 chans[4]; + s64 timestamp __aligned(8); + } scan; }; static const struct iio_event_spec tcs3472_events[] = { @@ -389,10 +393,10 @@ static irqreturn_t tcs3472_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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