[PATCH 3/4] [media] zr364xx: Adjust ten checks for null pointers

From: SF Markus Elfring
Date: Tue Aug 29 2017 - 01:34:15 EST


From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 28 Aug 2017 22:40:47 +0200
MIME-Version: 1.0
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The script âcheckpatch.plâ pointed information out like the following.

Comparison to NULL could be written !â

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/media/usb/zr364xx/zr364xx.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/media/usb/zr364xx/zr364xx.c b/drivers/media/usb/zr364xx/zr364xx.c
index 37cd6e20e68a..4cc6d2a9d91f 100644
--- a/drivers/media/usb/zr364xx/zr364xx.c
+++ b/drivers/media/usb/zr364xx/zr364xx.c
@@ -385,9 +385,9 @@ static int buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
vb);
int rc;

- DBG("%s, field=%d, fmt name = %s\n", __func__, field, cam->fmt != NULL ?
- cam->fmt->name : "");
- if (cam->fmt == NULL)
+ DBG("%s, field=%d, fmt name = %s\n", __func__, field,
+ cam->fmt ? cam->fmt->name : "");
+ if (!cam->fmt)
return -EINVAL;

buf->vb.size = cam->width * cam->height * (cam->fmt->depth >> 3);
@@ -787,7 +787,7 @@ static int zr364xx_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
struct zr364xx_camera *cam = video_drvdata(file);
char pixelformat_name[5];

- if (cam == NULL)
+ if (!cam)
return -ENODEV;

if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG) {
@@ -817,7 +817,7 @@ static int zr364xx_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
{
struct zr364xx_camera *cam;

- if (file == NULL)
+ if (!file)
return -ENODEV;
cam = video_drvdata(file);

@@ -979,13 +979,13 @@ static void read_pipe_completion(struct urb *purb)

pipe_info = purb->context;
_DBG("%s %p, status %d\n", __func__, purb, purb->status);
- if (pipe_info == NULL) {
+ if (!pipe_info) {
printk(KERN_ERR KBUILD_MODNAME ": no context!\n");
return;
}

cam = pipe_info->cam;
- if (cam == NULL) {
+ if (!cam) {
printk(KERN_ERR KBUILD_MODNAME ": no context!\n");
return;
}
@@ -1069,7 +1069,7 @@ static void zr364xx_stop_readpipe(struct zr364xx_camera *cam)
{
struct zr364xx_pipeinfo *pipe_info;

- if (cam == NULL) {
+ if (!cam) {
printk(KERN_ERR KBUILD_MODNAME ": invalid device\n");
return;
}
@@ -1273,7 +1273,7 @@ static int zr364xx_mmap(struct file *file, struct vm_area_struct *vma)
struct zr364xx_camera *cam = video_drvdata(file);
int ret;

- if (cam == NULL) {
+ if (!cam) {
DBG("%s: cam == NULL\n", __func__);
return -ENODEV;
}
@@ -1357,7 +1357,7 @@ static int zr364xx_board_init(struct zr364xx_camera *cam)

pipe->transfer_buffer = kzalloc(pipe->transfer_size,
GFP_KERNEL);
- if (pipe->transfer_buffer == NULL) {
+ if (!pipe->transfer_buffer) {
DBG("out of memory!\n");
return -ENOMEM;
}
@@ -1373,7 +1373,7 @@ static int zr364xx_board_init(struct zr364xx_camera *cam)
DBG("valloc %p, idx %lu, pdata %p\n",
&cam->buffer.frame[i], i,
cam->buffer.frame[i].lpvbits);
- if (cam->buffer.frame[i].lpvbits == NULL) {
+ if (!cam->buffer.frame[i].lpvbits) {
printk(KERN_INFO KBUILD_MODNAME ": out of memory. Using less frames\n");
break;
}
--
2.14.1