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Subject[PATCH 4.4 032/118] iio: ad799x: Fix buffered capture for ad7991/ad7995/ad7999
4.4-stable review patch.  If anyone has any objections, please let me know.


From: Lars-Peter Clausen <>

commit 7d3cc21dab5313a02f2f3ca8164529b828a030d1 upstream.

The data buffer for captured mode for the ad799x driver is allocated in the
update_scan_mode() callback. This callback is not set in the iio_info
struct for the ad7791/ad7995/ad7999, which means that the data buffer is
not allocated when a captured transfer is started. As a result the driver
crashes when the first sample is received. To fix this properly set the
update_scan_mode() callback.

Fixes: d8dca33027c1 ("staging:iio:ad799x: Preallocate sample buffer")
Signed-off-by: Lars-Peter Clausen <>
Signed-off-by: Jonathan Cameron <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/iio/adc/ad799x.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/iio/adc/ad799x.c
+++ b/drivers/iio/adc/ad799x.c
@@ -533,6 +533,7 @@ static struct attribute_group ad799x_eve
static const struct iio_info ad7991_info = {
.read_raw = &ad799x_read_raw,
.driver_module = THIS_MODULE,
+ .update_scan_mode = ad799x_update_scan_mode,

static const struct iio_info ad7993_4_7_8_noirq_info = {

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