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

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commit a2c12493ed 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>
This commit is contained in:
Adam Thomson 2014-11-06 12:11:00 +00:00 committed by Greg Kroah-Hartman
parent 1cf3347a2e
commit b32b30d35e
1 changed files with 4 additions and 2 deletions
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6
drivers/iio/inkern.c
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@ -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);