diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_fops.c')
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 92d864fc08ac..f191c2a75732 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2165,9 +2165,24 @@ static void comedi_vm_close(struct vm_area_struct *area) comedi_buf_map_put(bm); } +static int comedi_vm_access(struct vm_area_struct *vma, unsigned long addr, + void *buf, int len, int write) +{ + struct comedi_buf_map *bm = vma->vm_private_data; + unsigned long offset = + addr - vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT); + + if (len < 0) + return -EINVAL; + if (len > vma->vm_end - addr) + len = vma->vm_end - addr; + return comedi_buf_map_access(bm, offset, buf, len, write); +} + static const struct vm_operations_struct comedi_vm_ops = { .open = comedi_vm_open, .close = comedi_vm_close, + .access = comedi_vm_access, }; static int comedi_mmap(struct file *file, struct vm_area_struct *vma) |