From 7cbefad085c9112d0b1814db18423e5da072f5c8 Mon Sep 17 00:00:00 2001 From: Tuukka Toivonen Date: Thu, 23 Jul 2009 10:56:25 -0300 Subject: [PATCH] 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/videobuf-core.c | 7 +++---- drivers/media/video/videobuf-dma-sg.c | 4 ++-- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c index 8e93c6f25c8..a96b08d3df5 100644 --- a/drivers/media/video/videobuf-core.c +++ b/drivers/media/video/videobuf-core.c @@ -360,7 +360,7 @@ int __videobuf_mmap_setup(struct videobuf_queue *q, 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 @@ int videobuf_reqbufs(struct videobuf_queue *q, 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 @@ int videobuf_cgmbuf(struct videobuf_queue *q, 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 032ebae0134..a583d394696 100644 --- a/drivers/media/video/videobuf-dma-sg.c +++ b/drivers/media/video/videobuf-dma-sg.c @@ -588,7 +588,7 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q, 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 @@ static int __videobuf_mmap_mapper(struct videobuf_queue *q, 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; -- 2.41.0