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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>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Subject: Re: [PATCH 04/19] iio: accel: kxcjk-1013: Fix buffer alignment in iio_push_to_buffers_with_timestamp()
Date: Sat, 1 May 2021 22:10:48 +0300	[thread overview]
Message-ID: <CAHp75Vc9hOe66LaC7AzbmbZ5+EMCSdgCnxCLY0NQdurmWtyFVQ@mail.gmail.com> (raw)
In-Reply-To: <20210501170121.512209-5-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 this function.
>
> Fixes: 1a4fbf6a9286 ("iio: accel: kxcjk1013 3-axis accelerometer driver")
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> ---
>  drivers/iio/accel/kxcjk-1013.c | 24 ++++++++++++++----------
>  1 file changed, 14 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
> index ff724bc17a45..96ab247f17b3 100644
> --- a/drivers/iio/accel/kxcjk-1013.c
> +++ b/drivers/iio/accel/kxcjk-1013.c
> @@ -133,6 +133,13 @@ enum kx_acpi_type {
>         ACPI_KIOX010A,
>  };
>
> +enum kxcjk1013_axis {
> +       AXIS_X,
> +       AXIS_Y,
> +       AXIS_Z,

> +       AXIS_MAX,

I see that this is from original code, though I think you have a
chance to remove unneeded comma here. Let's make the terminator line
terminate.

> +};
> +
>  struct kxcjk1013_data {
>         struct regulator_bulk_data regulators[2];
>         struct i2c_client *client;
> @@ -140,7 +147,11 @@ struct kxcjk1013_data {
>         struct iio_trigger *motion_trig;
>         struct iio_mount_matrix orientation;
>         struct mutex mutex;
> -       s16 buffer[8];
> +       /* Ensure timestamp naturally aligned */
> +       struct {
> +               s16 chans[AXIS_MAX];
> +               s64 timestamp __aligned(8);
> +       } scan;
>         u8 odr_bits;
>         u8 range;
>         int wake_thres;
> @@ -154,13 +165,6 @@ struct kxcjk1013_data {
>         enum kx_acpi_type acpi_type;
>  };
>
> -enum kxcjk1013_axis {
> -       AXIS_X,
> -       AXIS_Y,
> -       AXIS_Z,
> -       AXIS_MAX,
> -};
> -
>  enum kxcjk1013_mode {
>         STANDBY,
>         OPERATION,
> @@ -1094,12 +1098,12 @@ static irqreturn_t kxcjk1013_trigger_handler(int irq, void *p)
>         ret = i2c_smbus_read_i2c_block_data_or_emulated(data->client,
>                                                         KXCJK1013_REG_XOUT_L,
>                                                         AXIS_MAX * 2,
> -                                                       (u8 *)data->buffer);
> +                                                       (u8 *)data->scan.chans);
>         mutex_unlock(&data->mutex);
>         if (ret < 0)
>                 goto err;
>
> -       iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
> +       iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
>                                            data->timestamp);
>  err:
>         iio_trigger_notify_done(indio_dev->trig);
> --
> 2.31.1
>


-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2021-05-01 19:11 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 [this message]
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
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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