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authorKim, Milo <Milo.Kim@ti.com>2012-09-18 05:56:00 +0100
committerJonathan Cameron <jic23@kernel.org>2012-09-22 10:13:33 +0100
commit3183bac16f537503eb3177773781d6d3059ad7b1 (patch)
tree26f62b097ad2e9b554e68ed4280fa5f445c5d7f0 /drivers/iio
parent801c4b5ca373c4cfe78912616d68e1f7fd84110c (diff)
downloadlinux-3183bac16f537503eb3177773781d6d3059ad7b1.tar.bz2
iio: inkern: clean up error return code
When the IIO consumer tries to get specific IIO channel, few error cases can be happened. (a) Memory allocation failure (b) No matched ADC channel error (c) Invalid input arguments This patch enables cleaning up error handling in case of (a) and (b). In error handling code, (a): the reference count of the IIO device should be decreased. (b): the allocated memory should be freed with restoring the reference count. Therefore iio_deivce_put() is called in both cases. This can be handled in the last error statement. Additionally, integer variable is used for stating each error case explicitly. Then, the error returns as ERR_PTR() with this value. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/inkern.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index e38f41464fe4..f2b78d4fe457 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -111,6 +111,7 @@ struct iio_channel *iio_channel_get(const char *name, const char *channel_name)
{
struct iio_map_internal *c_i = NULL, *c = NULL;
struct iio_channel *channel;
+ int err;
if (name == NULL && channel_name == NULL)
return ERR_PTR(-ENODEV);
@@ -131,8 +132,10 @@ struct iio_channel *iio_channel_get(const char *name, const char *channel_name)
return ERR_PTR(-ENODEV);
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
- if (channel == NULL)
+ if (channel == NULL) {
+ err = -ENOMEM;
goto error_no_mem;
+ }
channel->indio_dev = c->indio_dev;
@@ -141,19 +144,19 @@ struct iio_channel *iio_channel_get(const char *name, const char *channel_name)
iio_chan_spec_from_name(channel->indio_dev,
c->map->adc_channel_label);
- if (channel->channel == NULL)
+ if (channel->channel == NULL) {
+ err = -EINVAL;
goto error_no_chan;
+ }
}
return channel;
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);
+ return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(iio_channel_get);