iio: iio: Fix iio_channel_read return if channel havn't info

[firefly-linux-kernel-4.4.55.git] / drivers / iio / inkern.c

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f0846108d0067b4a979f3c3b86624b6e211cfa76..d33590e89337e500569fac35e1341b0f695e5e7f 100644 (file)
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -426,6 +426,9 @@ static int iio_channel_read(struct iio_channel *chan, int *val, int *val2,
        if (val2 == NULL)
                val2 = &unused;
 
+       if(!iio_channel_has_info(chan->channel, info))
+               return -EINVAL;
+
        if (chan->indio_dev->info->read_raw_multi) {
                ret = chan->indio_dev->info->read_raw_multi(chan->indio_dev,
                                        chan->channel, INDIO_MAX_RAW_ELEMENTS,