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Subject[PATCH 4/8] [media] videobuf-dma-sg: Adjust 24 checks for null values
From
Date
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 26 Dec 2016 20:30:19 +0100

Convert comparisons with the preprocessor symbol "NULL" or the value "0"
to condition checks without it.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
drivers/media/v4l2-core/videobuf-dma-sg.c | 48 +++++++++++++++----------------
1 file changed, 24 insertions(+), 24 deletions(-)

diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
index ab3c1f6a2ca1..9ccdc11aa016 100644
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -70,12 +70,12 @@ static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt,
int i;

sglist = vzalloc(nr_pages * sizeof(*sglist));
- if (NULL == sglist)
+ if (!sglist)
return NULL;
sg_init_table(sglist, nr_pages);
for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
pg = vmalloc_to_page(virt);
- if (NULL == pg)
+ if (!pg)
goto err;
BUG_ON(PageHighMem(pg));
sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
@@ -98,10 +98,10 @@ static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
struct scatterlist *sglist;
int i;

- if (NULL == pages[0])
+ if (!pages[0])
return NULL;
sglist = vmalloc(nr_pages * sizeof(*sglist));
- if (NULL == sglist)
+ if (!sglist)
return NULL;
sg_init_table(sglist, nr_pages);

@@ -112,7 +112,7 @@ static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
min_t(size_t, PAGE_SIZE - offset, size), offset);
size -= min_t(size_t, PAGE_SIZE - offset, size);
for (i = 1; i < nr_pages; i++) {
- if (NULL == pages[i])
+ if (!pages[i])
goto nopage;
if (PageHighMem(pages[i]))
goto highmem;
@@ -178,7 +178,7 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
dma->pages = kmalloc_array(dma->nr_pages,
sizeof(*dma->pages),
GFP_KERNEL);
- if (NULL == dma->pages)
+ if (!dma->pages)
return -ENOMEM;

if (rw == READ)
@@ -233,14 +233,14 @@ static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,

addr = dma_alloc_coherent(dma->dev, PAGE_SIZE,
&(dma->dma_addr[i]), GFP_KERNEL);
- if (addr == NULL)
+ if (!addr)
goto out_free_pages;

dma->vaddr_pages[i] = virt_to_page(addr);
}
dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP,
PAGE_KERNEL);
- if (NULL == dma->vaddr) {
+ if (!dma->vaddr) {
dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
goto out_free_pages;
}
@@ -277,7 +277,7 @@ static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
nr_pages, (unsigned long)addr);
dma->direction = direction;

- if (0 == addr)
+ if (!addr)
return -EINVAL;

dma->bus_addr = addr;
@@ -289,7 +289,7 @@ static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
{
MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
- BUG_ON(0 == dma->nr_pages);
+ BUG_ON(!dma->nr_pages);

if (dma->pages) {
dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
@@ -301,7 +301,7 @@ static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
}
if (dma->bus_addr) {
dma->sglist = vmalloc(sizeof(*dma->sglist));
- if (NULL != dma->sglist) {
+ if (dma->sglist) {
dma->sglen = 1;
sg_dma_address(&dma->sglist[0]) = dma->bus_addr
& PAGE_MASK;
@@ -309,14 +309,14 @@ static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
}
}
- if (NULL == dma->sglist) {
+ if (!dma->sglist) {
dprintk(1, "scatterlist is NULL\n");
return -ENOMEM;
}
if (!dma->bus_addr) {
dma->sglen = dma_map_sg(dev, dma->sglist,
dma->nr_pages, dma->direction);
- if (0 == dma->sglen) {
+ if (!dma->sglen) {
printk(KERN_WARNING
"%s: videobuf_map_sg failed\n", __func__);
vfree(dma->sglist);
@@ -406,11 +406,11 @@ static void videobuf_vm_close(struct vm_area_struct *vma)
map->count, vma->vm_start, vma->vm_end);

map->count--;
- if (0 == map->count) {
+ if (!map->count) {
dprintk(1, "munmap %p q=%p\n", map, q);
videobuf_queue_lock(q);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
- if (NULL == q->bufs[i])
+ if (!q->bufs[i])
continue;
mem = q->bufs[i]->priv;
if (!mem)
@@ -518,20 +518,20 @@ static int __videobuf_iolock(struct videobuf_queue *q,
switch (vb->memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_USERPTR:
- if (0 == vb->baddr) {
+ if (!vb->baddr) {
/* no userspace addr -- kernel bounce buffer */
pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
err = videobuf_dma_init_kernel(&mem->dma,
DMA_FROM_DEVICE,
pages);
- if (0 != err)
+ if (err)
return err;
} else if (vb->memory == V4L2_MEMORY_USERPTR) {
/* dma directly to userspace */
err = videobuf_dma_init_user(&mem->dma,
DMA_FROM_DEVICE,
vb->baddr, vb->bsize);
- if (0 != err)
+ if (err)
return err;
} else {
/* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
@@ -542,12 +542,12 @@ static int __videobuf_iolock(struct videobuf_queue *q,
err = videobuf_dma_init_user_locked(&mem->dma,
DMA_FROM_DEVICE,
vb->baddr, vb->bsize);
- if (0 != err)
+ if (err)
return err;
}
break;
case V4L2_MEMORY_OVERLAY:
- if (NULL == fbuf)
+ if (!fbuf)
return -EINVAL;
/* FIXME: need sanity checks for vb->boff */
/*
@@ -559,14 +559,14 @@ static int __videobuf_iolock(struct videobuf_queue *q,
pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
bus, pages);
- if (0 != err)
+ if (err)
return err;
break;
default:
BUG();
}
err = videobuf_dma_map(q->dev, &mem->dma);
- if (0 != err)
+ if (err)
return err;

return 0;
@@ -621,12 +621,12 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q,
/* create mapping + update buffer list */
retval = -ENOMEM;
map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
- if (NULL == map)
+ if (!map)
goto done;

size = 0;
for (i = first; i <= last; i++) {
- if (NULL == q->bufs[i])
+ if (!q->bufs[i])
continue;
q->bufs[i]->map = map;
q->bufs[i]->baddr = vma->vm_start + size;
--
2.11.0
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