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reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610150040 On Sun, Sep 27, 2026 at 06:59:29PM +0100, Jonathan Cameron wrote: > On Fri, 25 Sep 2026 16:02:39 +0500 > Shehryar Ahmad wrote: > > > Hi Jonathan, > > > > After issue raised by Sashiko in adis16203 graduation series [1], looking at > > other drivers if they might have same issue. It appears that the root > > cause is in adis_buffer.c itself. The library constructs the SPI > > transaction in channel array order while IIO core demultiplexes in > > scan_index order. > > > > adis16209 and adis16260 have the same mismatched ordering that > > adis16201/16203 had. > > > > Rather than reordering channel arrays in affected driver, > > would it be sensible to make adis_update_scan_mode() iterate > > in scan_index order instead of channel array order? > > > > Would this be the right approach, or is there something I'm missing? > > It is definitely plausible. For this I'd need some input from someone > who can actually test some of these parts. > > Nuno, you are listed as library maintainer - so can you get someone to > look at this please. +CC various other folk from maintainers or who have worked > in this area in last few years. > > Otherwise, just a comment to use a Link tag for cross references. > Hmm missed this one! So the issue looks very much real (just by code inspection). Just never saw it since the more recent devices I worked with just do burst mode which is not affected by that path. Moreover I'm not sure any of the affected drivers is really using the IIO demux (though I don't think that matters - seems to me the buffer will never respect scan_index order so not sure how it was ever right). +Cc Radu as he has been working with these devices and on the library. Radu, can you give a quick test here? Worst case scenario and you only have devices with burst mode, you can just tweak the driver to disable the burst path :) Thanks! - Nuno Sá > Thanks, > > Jonathan > > > > > > [1]: https://lore.kernel.org/all/20260914015321.7a660ab5@jic23-hlaptop/ > > > Link: https://lore.kernel.org/all/20260914015321.7a660ab5@jic23-hlaptop/ #[1] > > Signed-off-by: Shehryar Ahmad > > --- > > drivers/iio/imu/adis_buffer.c | 8 ++++---- > > 1 file changed, 4 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c > > index 501da4eae..45200b753 100644 > > --- a/drivers/iio/imu/adis_buffer.c > > +++ b/drivers/iio/imu/adis_buffer.c > > @@ -110,10 +110,10 @@ int adis_update_scan_mode(struct iio_dev *indio_dev, > > spi_message_add_tail(&adis->xfer[j], &adis->msg); > > } > > > > - chan = indio_dev->channels; > > - for (i = 0; i < indio_dev->num_channels; i++, chan++) { > > - if (!test_bit(chan->scan_index, scan_mask)) > > - continue; > > + for_each_set_bit(i, scan_mask, iio_get_masklength(indio_dev)) { > > + chan = iio_find_channel_from_si(indio_dev, i); > > + if (!chan) > > + return -EINVAL; > > if (chan->scan_type.storagebits == 32) > > *tx++ = cpu_to_be16((chan->address + 2) << 8); > > *tx++ = cpu_to_be16(chan->address << 8); >