iio: of_iio_channel_get_by_name() returns non-null pointers for error legs

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 0cf5f8e06cfcc6b6bc8c059871e153a391cbd122..1e8e94d4db7dec54e620f5ce822b1dd0b71293cc 100644 (file)
--- 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);