diff options
Diffstat (limited to 'drivers/media/video/videobuf-core.c')
| -rw-r--r-- | drivers/media/video/videobuf-core.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c index f1dfcff44e1b..dc2f6a8c0225 100644 --- a/drivers/media/video/videobuf-core.c +++ b/drivers/media/video/videobuf-core.c @@ -1123,15 +1123,29 @@ EXPORT_SYMBOL_GPL(videobuf_poll_stream); int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) { - int retval; + int rc = -EINVAL; + int i; MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); + if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) { + dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n"); + return -EINVAL; + } + mutex_lock(&q->vb_lock); - retval = CALL(q, mmap_mapper, q, vma); + for (i = 0; i < VIDEO_MAX_FRAME; i++) { + struct videobuf_buffer *buf = q->bufs[i]; + + if (buf && buf->memory == V4L2_MEMORY_MMAP && + buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) { + rc = CALL(q, mmap_mapper, q, buf, vma); + break; + } + } mutex_unlock(&q->vb_lock); - return retval; + return rc; } EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |