iio: proximity: as3935: fix iio_trigger_poll issue

Using iio_trigger_poll() can oops when multiple interrupts
happen before the first is handled.

Use iio_trigger_poll_chained() instead and use the timestamp
when processed, since it will be in theory be 2 ms max latency.

Fixes: 24ddb0e4bba4 ("iio: Add AS3935 lightning sensor support")
Cc: stable@vger.kernel.org
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/proximity/as3935.c b/drivers/iio/proximity/as3935.c
index 2e94e5ad884b579d8f528afcd4cdd5069e0fee83..aa4df0dcc8c9b81d67b3ebaedc9b9d25392bbfef 100644 (file)
--- a/drivers/iio/proximity/as3935.c
+++ b/drivers/iio/proximity/as3935.c
@@ -215,7 +215,7 @@ static irqreturn_t as3935_trigger_handler(int irq, void *private)
 
        st->buffer[0] = val & AS3935_DATA_MASK;
        iio_push_to_buffers_with_timestamp(indio_dev, &st->buffer,
-                                          pf->timestamp);
+                                          iio_get_time_ns(indio_dev));
 err_read:
        iio_trigger_notify_done(indio_dev->trig);
 
@@ -244,7 +244,7 @@ static void as3935_event_work(struct work_struct *work)
 
        switch (val) {
        case AS3935_EVENT_INT:
-               iio_trigger_poll(st->trig);
+               iio_trigger_poll_chained(st->trig);
                break;
        case AS3935_NOISE_INT:
                dev_warn(&st->spi->dev, "noise level is too high\n");