From: Matti Vaittinen Date: Tue, 3 Oct 2023 09:57:47 +0000 (+0300) Subject: tools: iio: iio_generic_buffer ensure alignment X-Git-Tag: v6.6.17~3201 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ab2998f9138dfddf77de70010dda4b3ad362cb48;p=platform%2Fkernel%2Flinux-rpi.git tools: iio: iio_generic_buffer ensure alignment [ Upstream commit 2d3dff577dd0ea8fe9637a13822f7603c4a881c8 ] The iio_generic_buffer can return garbage values when the total size of scan data is not a multiple of the largest element in the scan. This can be demonstrated by reading a scan, consisting, for example of one 4-byte and one 2-byte element, where the 4-byte element is first in the buffer. The IIO generic buffer code does not take into account the last two padding bytes that are needed to ensure that the 4-byte data for next scan is correctly aligned. Add the padding bytes required to align the next sample with the scan size. Signed-off-by: Matti Vaittinen Fixes: e58537ccce73 ("staging: iio: update example application.") Link: https://lore.kernel.org/r/ZRvlm4ktNLu+qmlf@dc78bmyyyyyyyyyyyyydt-3.rev.dnainternet.fi Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- diff --git a/tools/iio/iio_generic_buffer.c b/tools/iio/iio_generic_buffer.c index 44bbf80..0d0a7a1 100644 --- a/tools/iio/iio_generic_buffer.c +++ b/tools/iio/iio_generic_buffer.c @@ -54,9 +54,12 @@ enum autochan { static unsigned int size_from_channelarray(struct iio_channel_info *channels, int num_channels) { unsigned int bytes = 0; - int i = 0; + int i = 0, max = 0; + unsigned int misalignment; while (i < num_channels) { + if (channels[i].bytes > max) + max = channels[i].bytes; if (bytes % channels[i].bytes == 0) channels[i].location = bytes; else @@ -66,6 +69,14 @@ static unsigned int size_from_channelarray(struct iio_channel_info *channels, in bytes = channels[i].location + channels[i].bytes; i++; } + /* + * We want the data in next sample to also be properly aligned so + * we'll add padding at the end if needed. Adding padding only + * works for channel data which size is 2^n bytes. + */ + misalignment = bytes % max; + if (misalignment) + bytes += max - misalignment; return bytes; }