6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sean Anderson sean.anderson@linux.dev
[ Upstream commit 89b898c627a49b978a4c323ea6856eacfc21f6ba ]
ams_enable_channel_sequence constructs a "scan_mask" for all the PS and PL channels. This works out fine, since scan_index for these channels is less than 64. However, it also includes the ams_ctrl_channels, where scan_index is greater than 64, triggering undefined behavior. Since we don't need these channels anyway, just exclude them.
Fixes: d5c70627a794 ("iio: adc: Add Xilinx AMS driver") Signed-off-by: Sean Anderson sean.anderson@linux.dev Link: https://lore.kernel.org/r/20240311162800.11074-1-sean.anderson@linux.dev Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/adc/xilinx-ams.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/xilinx-ams.c b/drivers/iio/adc/xilinx-ams.c index f0b71a1220e02..f52abf759260f 100644 --- a/drivers/iio/adc/xilinx-ams.c +++ b/drivers/iio/adc/xilinx-ams.c @@ -414,8 +414,12 @@ static void ams_enable_channel_sequence(struct iio_dev *indio_dev)
/* Run calibration of PS & PL as part of the sequence */ scan_mask = BIT(0) | BIT(AMS_PS_SEQ_MAX); - for (i = 0; i < indio_dev->num_channels; i++) - scan_mask |= BIT_ULL(indio_dev->channels[i].scan_index); + for (i = 0; i < indio_dev->num_channels; i++) { + const struct iio_chan_spec *chan = &indio_dev->channels[i]; + + if (chan->scan_index < AMS_CTRL_SEQ_BASE) + scan_mask |= BIT_ULL(chan->scan_index); + }
if (ams->ps_base) { /* put sysmon in a soft reset to change the sequence */