diff options
author | Somya Anand <somyaanand214@gmail.com> | 2015-03-16 19:34:09 +0530 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-16 16:28:47 +0100 |
commit | 6e3f3bb8631600ffc5788a4e9476ea841feac964 (patch) | |
tree | 7045e82b72cd9603d6a7161b498d9a83a31163f2 /drivers/staging | |
parent | 87e3dbc27c025b3168922c29b06775f8a8cfbce6 (diff) |
Staging: goldfish: use !x instead of x == NULL
Functions like devm_kzalloc, kmalloc_array, devm_ioremap,
usb_alloc_urb, alloc_netdev return NULL as a return value on failure.
Generally, When NULL represents failure, !x is commonly used.
This patch cleans up the tests on the results of these functions, thereby
using !x instead of x == NULL or NULL == x. This is done via following
coccinelle script:
@prob_7@
identifier x;
statement S;
@@
(
x = devm_kzalloc(...);
|
x = usb_alloc_urb(...);
|
x = kmalloc_array(...);
|
x = devm_ioremap(...);
|
x = alloc_netdev(...);
)
...
- if(NULL == x)
+ if(!x)
S
Further we have used isomorphism characteristics of coccinelle to
indicate x == NULL and NULL == x are equivalent. This is done via
following iso script.
Expression
@ is_null @ expression X; @@
X == NULL <=> NULL == X
Signed-off-by: Somya Anand <somyaanand214@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/goldfish/goldfish_audio.c | 2 | ||||
-rw-r--r-- | drivers/staging/goldfish/goldfish_nand.c | 6 |
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/staging/goldfish/goldfish_audio.c b/drivers/staging/goldfish/goldfish_audio.c index c7f8f1c77401..81abf98025c5 100644 --- a/drivers/staging/goldfish/goldfish_audio.c +++ b/drivers/staging/goldfish/goldfish_audio.c @@ -273,7 +273,7 @@ static int goldfish_audio_probe(struct platform_device *pdev) dma_addr_t buf_addr; data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); - if (data == NULL) + if (!data) return -ENOMEM; spin_lock_init(&data->lock); init_waitqueue_head(&data->wait); diff --git a/drivers/staging/goldfish/goldfish_nand.c b/drivers/staging/goldfish/goldfish_nand.c index d68f216a7e77..213877a2c430 100644 --- a/drivers/staging/goldfish/goldfish_nand.c +++ b/drivers/staging/goldfish/goldfish_nand.c @@ -330,7 +330,7 @@ static int goldfish_nand_init_device(struct platform_device *pdev, mtd->priv = nand; name = devm_kzalloc(&pdev->dev, name_len + 1, GFP_KERNEL); - if (name == NULL) + if (!name) return -ENOMEM; mtd->name = name; @@ -383,7 +383,7 @@ static int goldfish_nand_probe(struct platform_device *pdev) return -ENODEV; base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE); - if (base == NULL) + if (!base) return -ENOMEM; version = readl(base + NAND_VERSION); @@ -399,7 +399,7 @@ static int goldfish_nand_probe(struct platform_device *pdev) nand = devm_kzalloc(&pdev->dev, sizeof(*nand) + sizeof(struct mtd_info) * num_dev, GFP_KERNEL); - if (nand == NULL) + if (!nand) return -ENOMEM; mutex_init(&nand->lock); |