/*
- * $Id: video-buf.c,v 1.15 2004/11/07 14:45:00 kraxel Exp $
*
* generic helper functions for video4linux capture buffers, to handle
* memory management and PCI DMA. Right now bttv + saa7134 use it.
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
struct page *pg;
int i;
- sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
+ sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
if (NULL == sglist)
return NULL;
- memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
pg = vmalloc_to_page(virt);
if (NULL == pg)
if (NULL == pages[0])
return NULL;
- sglist = kmalloc(sizeof(*sglist) * nr_pages, GFP_KERNEL);
+ sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
if (NULL == sglist)
return NULL;
- memset(sglist, 0, sizeof(*sglist) * nr_pages);
if (NULL == pages[0])
goto nopage;
data,size,dma->nr_pages);
down_read(¤t->mm->mmap_sem);
- err = get_user_pages(current,current->mm,
+ err = get_user_pages(current,current->mm,
data & PAGE_MASK, dma->nr_pages,
rw == READ, 1, /* force */
dma->pages, NULL);
return -ENOMEM;
}
- if (!dma->bus_addr)
+ if (!dma->bus_addr) {
dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages,
dma->direction);
+ if (0 == dma->sglen) {
+ printk(KERN_WARNING
+ "%s: pci_map_sg failed\n",__FUNCTION__);
+ kfree(dma->sglist);
+ dma->sglist = NULL;
+ dma->sglen = 0;
+ return -EIO;
+ }
+ }
return 0;
}
kfree(dma->pages);
dma->pages = NULL;
}
- if (dma->vmalloc) {
- vfree(dma->vmalloc);
- dma->vmalloc = NULL;
- }
+
+ vfree(dma->vmalloc);
+ dma->vmalloc = NULL;
+
if (dma->bus_addr) {
dma->bus_addr = 0;
}
{
struct videobuf_buffer *vb;
- vb = kmalloc(size,GFP_KERNEL);
+ vb = kzalloc(size,GFP_KERNEL);
if (NULL != vb) {
- memset(vb,0,size);
videobuf_dma_init(&vb->dma);
init_waitqueue_head(&vb->done);
vb->magic = MAGIC_BUFFER;
{
enum v4l2_field field;
unsigned long flags;
- int retval;
+ int retval;
- /* setup stuff */
- retval = -ENOMEM;
+ /* setup stuff */
q->read_buf = videobuf_alloc(q->msize);
if (NULL == q->read_buf)
- goto done;
+ return -ENOMEM;
q->read_buf->memory = V4L2_MEMORY_USERPTR;
q->read_buf->baddr = (unsigned long)data;
- q->read_buf->bsize = count;
+ q->read_buf->bsize = count;
field = videobuf_next_field(q);
retval = q->ops->buf_prepare(q,q->read_buf,field);
if (0 != retval)
goto done;
- /* start capture & wait */
+ /* start capture & wait */
spin_lock_irqsave(q->irqlock,flags);
q->ops->buf_queue(q,q->read_buf);
spin_unlock_irqrestore(q->irqlock,flags);
- retval = videobuf_waiton(q->read_buf,0,0);
- if (0 == retval) {
+ retval = videobuf_waiton(q->read_buf,0,0);
+ if (0 == retval) {
videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
if (STATE_ERROR == q->read_buf->state)
retval = -EIO;
if (NULL == q->read_buf)
goto done;
q->read_buf->memory = V4L2_MEMORY_USERPTR;
+ q->read_buf->bsize = count; /* preferred size */
field = videobuf_next_field(q);
retval = q->ops->buf_prepare(q,q->read_buf,field);
- if (0 != retval)
+ if (0 != retval) {
+ kfree (q->read_buf);
+ q->read_buf = NULL;
goto done;
+ }
spin_lock_irqsave(q->irqlock,flags);
q->ops->buf_queue(q,q->read_buf);
spin_unlock_irqrestore(q->irqlock,flags);
}
/* wait until capture is done */
- retval = videobuf_waiton(q->read_buf, nonblocking, 1);
+ retval = videobuf_waiton(q->read_buf, nonblocking, 1);
if (0 != retval)
goto done;
videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
int i;
videobuf_queue_cancel(q);
+ videobuf_mmap_free(q);
INIT_LIST_HEAD(&q->stream);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
vaddr,vma->vm_start,vma->vm_end);
- if (vaddr > vma->vm_end)
+ if (vaddr > vma->vm_end)
return NOPAGE_SIGBUS;
page = alloc_page(GFP_USER);
if (!page)