V4L/DVB (13165): videobuf do not force buffer size to be multiple of PAGE_SIZE
When the image size (bytesperline*height) is not multiple
of PAGE_SIZE, v4l2 rounded the required buffer size to
be multiple of PAGE_SIZE. This prevented user space
to store images directly into userptr buffers which were
not multiple of PAGE_SIZE. This constraint is removed.
The start address is still assumed to be required
page-aligned, ie., when v4l2 allocates mmap buffers,
the offset between different buffers is page-aligned.
Signed-off-by: Tuukka Toivonen <tuukka.o.toivonen@nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index 8e93c6f..a96b08d 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -360,7 +360,7 @@
q->bufs[i]->bsize = bsize;
switch (memory) {
case V4L2_MEMORY_MMAP:
- q->bufs[i]->boff = bsize * i;
+ q->bufs[i]->boff = PAGE_ALIGN(bsize) * i;
break;
case V4L2_MEMORY_USERPTR:
case V4L2_MEMORY_OVERLAY:
@@ -430,9 +430,8 @@
count = VIDEO_MAX_FRAME;
size = 0;
q->ops->buf_setup(q, &count, &size);
- size = PAGE_ALIGN(size);
dprintk(1, "reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
- count, size, (count*size)>>PAGE_SHIFT);
+ count, size, (count*PAGE_ALIGN(size))>>PAGE_SHIFT);
retval = __videobuf_mmap_setup(q, count, size, req->memory);
if (retval < 0) {
@@ -1099,7 +1098,7 @@
mbuf->size = 0;
for (i = 0; i < mbuf->frames; i++) {
mbuf->offsets[i] = q->bufs[i]->boff;
- mbuf->size += q->bufs[i]->bsize;
+ mbuf->size += PAGE_ALIGN(q->bufs[i]->bsize);
}
return 0;
diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c
index 032ebae..a583d39 100644
--- a/drivers/media/video/videobuf-dma-sg.c
+++ b/drivers/media/video/videobuf-dma-sg.c
@@ -588,7 +588,7 @@
retval = -EBUSY;
goto done;
}
- size += q->bufs[last]->bsize;
+ size += PAGE_ALIGN(q->bufs[last]->bsize);
if (size == (vma->vm_end - vma->vm_start))
break;
}
@@ -610,7 +610,7 @@
continue;
q->bufs[i]->map = map;
q->bufs[i]->baddr = vma->vm_start + size;
- size += q->bufs[i]->bsize;
+ size += PAGE_ALIGN(q->bufs[i]->bsize);
}
map->count = 1;