@@ -760,9 +760,25 @@ static int iio_channel_read_avail(struct iio_channel *chan,
if (!iio_channel_has_available(chan->channel, info))
return -EINVAL;
- if (iio_info->read_avail)
- return iio_info->read_avail(chan->indio_dev, chan->channel,
- vals, type, length, info);
+ if (iio_info->read_avail) {
+ const int *vals_tmp;
+ int ret;
+
+ ret = iio_info->read_avail(chan->indio_dev, chan->channel,
+ &vals_tmp, type, length, info);
+ if (ret < 0)
+ return ret;
+
+ *vals = kmemdup_array(vals_tmp, *length, sizeof(int), GFP_KERNEL);
+ if (!*vals)
+ return -ENOMEM;
+
+ if (iio_info->read_avail_release_resource)
+ iio_info->read_avail_release_resource(
+ chan->indio_dev, chan->channel, vals_tmp, info);
+
+ return ret;
+ }
return -EINVAL;
}
@@ -789,9 +805,11 @@ int iio_read_avail_channel_raw(struct iio_channel *chan,
ret = iio_read_avail_channel_attribute(chan, vals, &type, length,
IIO_CHAN_INFO_RAW);
- if (ret >= 0 && type != IIO_VAL_INT)
+ if (ret >= 0 && type != IIO_VAL_INT) {
/* raw values are assumed to be IIO_VAL_INT */
+ kfree(*vals);
ret = -EINVAL;
+ }
return ret;
}
@@ -820,24 +838,31 @@ static int iio_channel_read_max(struct iio_channel *chan,
if (val2)
*val2 = vals[5];
}
- return 0;
+ ret = 0;
+ break;
case IIO_AVAIL_LIST:
- if (length <= 0)
- return -EINVAL;
+ if (length <= 0) {
+ ret = -EINVAL;
+ goto out;
+ }
switch (*type) {
case IIO_VAL_INT:
*val = max_array(vals, length);
+ ret = 0;
break;
default:
/* TODO: learn about max for other iio values */
- return -EINVAL;
+ ret = -EINVAL;
}
- return 0;
+ break;
default:
- return -EINVAL;
+ ret = -EINVAL;
}
+out:
+ kfree(vals);
+ return ret;
}
int iio_read_max_channel_raw(struct iio_channel *chan, int *val)
@@ -876,24 +901,31 @@ static int iio_channel_read_min(struct iio_channel *chan,
if (val2)
*val2 = vals[1];
}
- return 0;
+ ret = 0;
+ break;
case IIO_AVAIL_LIST:
- if (length <= 0)
- return -EINVAL;
+ if (length <= 0) {
+ ret = -EINVAL;
+ goto out;
+ }
switch (*type) {
case IIO_VAL_INT:
*val = min_array(vals, length);
+ ret = 0;
break;
default:
/* TODO: learn about min for other iio values */
- return -EINVAL;
+ ret = -EINVAL;
}
- return 0;
+ break;
default:
- return -EINVAL;
+ ret = -EINVAL;
}
+out:
+ kfree(vals);
+ return ret;
}
int iio_read_min_channel_raw(struct iio_channel *chan, int *val)
@@ -316,7 +316,7 @@ int iio_read_min_channel_raw(struct iio_channel *chan, int *val);
/**
* iio_read_avail_channel_raw() - read available raw values from a given channel
* @chan: The channel being queried.
- * @vals: Available values read back.
+ * @vals: Available values read back. Must be freed after use.
* @length: Number of entries in vals.
*
* Returns an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST.
@@ -334,7 +334,7 @@ int iio_read_avail_channel_raw(struct iio_channel *chan,
/**
* iio_read_avail_channel_attribute() - read available channel attribute values
* @chan: The channel being queried.
- * @vals: Available values read back.
+ * @vals: Available values read back. Must be freed after use.
* @type: Type of values read back.
* @length: Number of entries in vals.
* @attribute: info attribute to be read back.
Consumers need to call the read_avail_release_resource after reading the available info. To call the release with info_exists locked, copy the available info from the producer and immediately call its release callback. With this change, users of iio_read_avail_channel_raw() and iio_read_avail_channel_attribute() must free the copied avail info after calling them. Signed-off-by: Matteo Martelli <matteomartelli3@gmail.com> --- drivers/iio/inkern.c | 64 +++++++++++++++++++++++++++++++++----------- include/linux/iio/consumer.h | 4 +-- 2 files changed, 50 insertions(+), 18 deletions(-)