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authorKim, Milo <Milo.Kim@ti.com>2012-09-17 09:44:00 +0100
committerJonathan Cameron <jic23@kernel.org>2012-09-17 19:16:42 +0100
commitb2b79ffa40d7ae40115631660ff8b6da3cf989b6 (patch)
tree89471ce2b1f1d5fb24dd55f4d91fb64058818348 /drivers/iio/inkern.c
parent2cc412b513f70ce914a3554a34917f7585a16f04 (diff)
downloadlwn-b2b79ffa40d7ae40115631660ff8b6da3cf989b6.tar.gz
lwn-b2b79ffa40d7ae40115631660ff8b6da3cf989b6.zip
iio: inkern: add error case in iio_channel_get()
The datasheet name is defined in the IIO driver. On the other hand, the adc_channel_label is configured in the platform side. If the datasheet name is not matched with any adc_channel_label, the iio_channel_get() should be returned as error for preventing invalid channel data access. This can be handled either way. (a) checking null data when using it : in the xxx_read_raw() or (b) error returns when the channel is requested : this patch The IIO consumer can't use the channel with invalid channel spec. Therefore case (b) is more reasonable. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/inkern.c')
-rw-r--r--drivers/iio/inkern.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 028c657f8da3..d539e1e297ba 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -136,12 +136,21 @@ struct iio_channel *iio_channel_get(const char *name, const char *channel_name)
channel->indio_dev = c->indio_dev;
- if (c->map->adc_channel_label)
+ if (c->map->adc_channel_label) {
channel->channel =
iio_chan_spec_from_name(channel->indio_dev,
c->map->adc_channel_label);
+ if (channel->channel == NULL)
+ goto error_no_chan;
+ }
+
return channel;
+
+error_no_chan:
+ iio_device_put(c->indio_dev);
+ kfree(channel);
+ return ERR_PTR(-EINVAL);
}
EXPORT_SYMBOL_GPL(iio_channel_get);