diff options
| author | Hans Verkuil <hverkuil@xs4all.nl> | 2010-03-28 16:09:05 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-05-19 19:57:54 +0400 |
| commit | 0b62b73778554cd47480ea465f0b255cc63b4336 (patch) | |
| tree | 880c3c5fc9b9ba75c65902da9dc77e8c97d3967d /drivers/media/video/videobuf-core.c | |
| parent | 37111039c9521c751ce0597c129fe6d45ba72818 (diff) | |
| download | linux-0b62b73778554cd47480ea465f0b255cc63b4336.tar.xz | |
V4L/DVB: v4l videobuf: add videobuf_buffer *buf as argument to mmap_mapper
mmap_mapper should operate on a buffer, not on a complete queue. So let
the videobuf-core find the correct buffer instead of duplicating that
code in each mmap_mapper implementation.
The dma-sg implementation has backwards compatibility code for handling
the V4L1_COMPAT layer. This code is now under the v4L1_COMPAT config option.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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); |