linux-kernel - [PATCH 1/2] iio: inkern: add error case in iio_channel

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Message-ID: <A874F61F95741C4A9BA573A70FE3998F41EF509D@DQHE02.ent.ti.com>
Date:	Mon, 17 Sep 2012 08:44:42 +0000
From:	"Kim, Milo" <Milo.Kim@...com>
To:	Jonathan Cameron <jic23@...nel.org>
CC:	Jonathan Cameron <jic23@....ac.uk>,
	Lars-Peter Clausen <lars@...afoo.de>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] 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@...com>
---
 drivers/iio/inkern.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 1faa240..13748c0 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);
 
-- 
1.7.9.5


Best Regards,
Milo

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