[PATCH 3.12 113/170] iio: of_iio_channel_get_by_name() returns non-null pointers for error legs

Jiri Slaby
2014-07-18T13:14:39Z

From: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit a2c12493ed7e63a18cef33a71686d12ffcd6600e upstream.

Currently in the inkern.c code for IIO framework, the function
of_iio_channel_get_by_name() will return a non-NULL pointer when
it cannot find a channel using of_iio_channel_get() and when it
tries to search for 'io-channel-ranges' property and fails. This
is incorrect behaviour as the function which calls this expects
a NULL pointer for failure. This patch rectifies the issue.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/iio/inkern.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 0cf5f8e06cfc..1e8e94d4db7d 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -183,7 +183,7 @@ static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np,
else if (name && index >= 0) {
pr_err("ERROR: could not get IIO channel %s:%s(%i)\n",
np->full_name, name ? name : "", index);
- return chan;
+ return NULL;
}

/*
@@ -193,8 +193,9 @@ static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np,
*/
np = np->parent;
if (np && !of_get_property(np, "io-channel-ranges", NULL))
- break;
+ return NULL;
}
+
return chan;
}

@@ -317,6 +318,7 @@ struct iio_channel *iio_channel_get(struct device *dev,
if (channel != NULL)
return channel;
}
+
return iio_channel_get_sys(name, channel_name);
}
EXPORT_SYMBOL_GPL(iio_channel_get);
--
2.0.0