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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Jonathan Cameron <jic23@kernel.org>
Cc: linux-iio <linux-iio@vger.kernel.org>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: Re: [PATCH 19/19] iio: light: tcs3472: Fix buffer alignment in iio_push_to_buffers_with_timestamp()
Date: Sat, 1 May 2021 22:09:32 +0300	[thread overview]
Message-ID: <CAHp75VeDefx25avQSBE0qHbid=wjU=Tof-v1SzUU18BfTbyvmQ@mail.gmail.com> (raw)
In-Reply-To: <20210501170121.512209-20-jic23@kernel.org>

On Sat, May 1, 2021 at 8:03 PM Jonathan Cameron <jic23@kernel.org> wrote:
>
> From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>
> 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()

Missed period at the end of the line.

> 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@huawei.com>
> ---
>  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 a0dc447aeb68..90dc3fef59e6 100644
> --- a/drivers/iio/light/tcs3472.c
> +++ b/drivers/iio/light/tcs3472.c
> @@ -64,7 +64,11 @@ 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[] = {
> @@ -386,10 +390,10 @@ 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:
> --
> 2.31.1
>


-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2021-05-01 19:09 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-01 17:01 [PATCH 00/19] IIO: Alignment fixes part 2 - struct used to ensure alignment Jonathan Cameron
2021-05-01 17:01 ` [PATCH 01/19] iio: accel: bma180: Fix buffer alignment in iio_push_to_buffers_with_timestamp() Jonathan Cameron
2021-05-13 17:22   ` Jonathan Cameron
2021-05-01 17:01 ` [PATCH 02/19] iio: accel: bma220: " Jonathan Cameron
2021-05-13 17:26   ` Jonathan Cameron
2021-05-01 17:01 ` [PATCH 03/19] iio: accel: hid: " Jonathan Cameron
2021-05-13 17:28   ` Jonathan Cameron
2021-05-01 17:01 ` [PATCH 04/19] iio: accel: kxcjk-1013: " Jonathan Cameron
2021-05-01 19:10   ` Andy Shevchenko
2021-05-13 17:33     ` Jonathan Cameron
2021-05-01 17:01 ` [PATCH 05/19] iio: accel: mxc4005: Fix overread of data and alignment issue Jonathan Cameron
2021-05-13 17:37   ` Jonathan Cameron
2021-05-01 17:01 ` [PATCH 06/19] iio: accel: stk8312: Fix buffer alignment in iio_push_to_buffers_with_timestamp() Jonathan Cameron
2021-05-13 17:39   ` Jonathan Cameron
2021-05-01 17:01 ` [PATCH 07/19] iio: accel: stk8ba50: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 08/19] iio: adc: ti-ads1015: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 09/19] iio: adc: vf610: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 10/19] iio: gyro: bmg160: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 11/19] iio: humidity: am2315: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 12/19] iio: prox: srf08: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 13/19] iio: prox: pulsed-light: " Jonathan Cameron
2021-05-06  6:46   ` Matt Ranostay
2021-05-01 17:01 ` [PATCH 14/19] iio: prox: as3935: " Jonathan Cameron
2021-05-06  6:45   ` Matt Ranostay
2021-05-01 17:01 ` [PATCH 15/19] iio: magn: hmc5843: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 16/19] iio: magn: bmc150: " Jonathan Cameron
2021-05-05 12:57   ` Linus Walleij
2021-05-07  9:23     ` Jonathan Cameron
2021-05-13 17:50   ` Jonathan Cameron
2021-05-01 17:01 ` [PATCH 17/19] iio: light: isl29125: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 18/19] iio: light: tcs3414: " Jonathan Cameron
2021-05-01 17:01 ` [PATCH 19/19] iio: light: tcs3472: " Jonathan Cameron
2021-05-01 19:09   ` Andy Shevchenko [this message]
2021-05-01 19:12 ` [PATCH 00/19] IIO: Alignment fixes part 2 - struct used to ensure alignment Andy Shevchenko
2021-05-13 17:54   ` Jonathan Cameron

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