linux-kernel - [PATCH 2/2] iio: inkern: put the IIO device when mem alloc gets failed

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Date:	Mon, 17 Sep 2012 08:44:47 +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 2/2] iio: inkern: put the IIO device when mem alloc gets
 failed

 The reference count of the IIO device is increased if the IIO map has
 matched consumer name.
 After then, it tries to allocate the iio_channel which is used by the consumer.
 If memory allocation gets failed, the reference count should be decreased.

 This patch enables restoring the reference count of the IIO device.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@...com>
---
 drivers/iio/inkern.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 13748c0..aff034b 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -132,7 +132,7 @@ struct iio_channel *iio_channel_get(const char *name, const char *channel_name)
 
 	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
 	if (channel == NULL)
-		return ERR_PTR(-ENOMEM);
+		goto error_no_mem;
 
 	channel->indio_dev = c->indio_dev;
 
@@ -151,6 +151,9 @@ error_no_chan:
 	iio_device_put(c->indio_dev);
 	kfree(channel);
 	return ERR_PTR(-EINVAL);
+error_no_mem:
+	iio_device_put(c->indio_dev);
+	return ERR_PTR(-ENOMEM);
 }
 EXPORT_SYMBOL_GPL(iio_channel_get);
 
-- 
1.7.9.5


Best Regards,
Milo


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