Jan 01 2014

staging:iio:impedance:ad5933: correct error check 

Author: Julia Lawall <Julia.Lawall@lip6.fr>

iio_kfifo_allocate returns NULL in case of error.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// 
@@
expression *x;
identifier f;
statement S1,S2;
@@

*x = f(...);
 if (x) { <+... when != if (...) S1 else S2
     -ENOMEM ...+> }
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Jonathan Cameron 
cc: stable@vger.kernel.org

---
 drivers/staging/iio/impedance-analyzer/ad5933.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
index 0a4298b..2b96665 100644
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -629,7 +629,7 @@ static int ad5933_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 	struct iio_buffer *buffer;
 
 	buffer = iio_kfifo_allocate(indio_dev);
-	if (buffer)
+	if (!buffer)
 		return -ENOMEM;
 
 	iio_device_attach_buffer(indio_dev, buffer);

qlambert