Hi Greg,
as the author of the original patch I just mailed the backport to
Stable@xxxxxxxxxxxxxxx (and a lot of others as a result of
`scripts/get_maintainer.pl` and `git send-email`).
However, I don't know if Jonathan and the other maintainers want the
patch applied to the 4.4-stable tree or to any other stable or longterm
tree.
Thanks,
Lars
On 19.01.20 14:35, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>
> The patch below does not apply to the 4.4-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> From 883f616530692d81cb70f8a32d85c0d2afc05f69 Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?Lars=20M=C3=B6llendorf?= <lars.moellendorf@xxxxxxxxxx>
> Date: Fri, 13 Dec 2019 14:50:55 +0100
> Subject: [PATCH] iio: buffer: align the size of scan bytes to size of the
> largest element
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> Previous versions of `iio_compute_scan_bytes` only aligned each element
> to its own length (i.e. its own natural alignment). Because multiple
> consecutive sets of scan elements are buffered this does not work in
> case the computed scan bytes do not align with the natural alignment of
> the first scan element in the set.
>
> This commit fixes this by aligning the scan bytes to the natural
> alignment of the largest scan element in the set.
>
> Fixes: 959d2952d124 ("staging:iio: make iio_sw_buffer_preenable much more general.")
> Signed-off-by: Lars Möllendorf <lars.moellendorf@xxxxxxxxxx>
> Reviewed-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
> Cc: <Stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>
> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> index c193d64e5217..112225c0e486 100644
> --- a/drivers/iio/industrialio-buffer.c
> +++ b/drivers/iio/industrialio-buffer.c
> @@ -566,7 +566,7 @@ static int iio_compute_scan_bytes(struct iio_dev *indio_dev,
> const unsigned long *mask, bool timestamp)
> {
> unsigned bytes = 0;
> - int length, i;
> + int length, i, largest = 0;
>
> /* How much space will the demuxed element take? */
> for_each_set_bit(i, mask,
> @@ -574,13 +574,17 @@ static int iio_compute_scan_bytes(struct iio_dev *indio_dev,
> length = iio_storage_bytes_for_si(indio_dev, i);
> bytes = ALIGN(bytes, length);
> bytes += length;
> + largest = max(largest, length);
> }
>
> if (timestamp) {
> length = iio_storage_bytes_for_timestamp(indio_dev);
> bytes = ALIGN(bytes, length);
> bytes += length;
> + largest = max(largest, length);
> }
> +
> + bytes = ALIGN(bytes, largest);
> return bytes;
> }
>
>
--
Lars Möllendorf, B. Eng.
Tel.: +49 (0) 7641 93500-425
Fax: +49 (0) 7641 93500-999
E-Mail: lars.moellendorf@xxxxxxxxxx <mailto:lars.moellendorf@xxxxxxxxxx>
Website: www.plating.de <http://www.plating.de>
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