From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pz0-f115.google.com ([209.85.222.115]:47527 "EHLO mail-pz0-f115.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752452AbZELNSM (ORCPT ); Tue, 12 May 2009 09:18:12 -0400 Received: by pzk13 with SMTP id 13so108991pzk.33 for ; Tue, 12 May 2009 06:18:13 -0700 (PDT) From: Magnus Damm To: linux-media@vger.kernel.org Cc: mchehab@infradead.org, hverkuil@xs4all.nl, linux-mm@kvack.org, lethal@linux-sh.org, hannes@cmpxchg.org, Magnus Damm , akpm@linux-foundation.org Date: Tue, 12 May 2009 22:07:19 +0900 Message-Id: <20090512130719.7857.85985.sendpatchset@rx1.opensource.se> Subject: [PATCH] videobuf-dma-contig: zero copy USERPTR V3 comments Sender: linux-media-owner@vger.kernel.org List-ID: From: Magnus Damm This patch adds function descriptions to V3 of the V4L2 videobuf-dma-contig USERPTR zero copy patch. Signed-off-by: Magnus Damm --- drivers/media/video/videobuf-dma-contig.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) --- 0005/drivers/media/video/videobuf-dma-contig.c +++ work/drivers/media/video/videobuf-dma-contig.c 2009-05-12 21:14:40.000000000 +0900 @@ -110,6 +110,12 @@ static struct vm_operations_struct video .close = videobuf_vm_close, }; +/** + * videobuf_dma_contig_user_put() - reset pointer to user space buffer + * @mem: per-buffer private videobuf-dma-contig data + * + * This function resets the user space pointer + */ static void videobuf_dma_contig_user_put(struct videobuf_dma_contig_memory *mem) { mem->is_userptr = 0; @@ -117,6 +123,16 @@ static void videobuf_dma_contig_user_put mem->size = 0; } +/** + * videobuf_dma_contig_user_get() - setup user space memory pointer + * @mem: per-buffer private videobuf-dma-contig data + * @vb: video buffer to map + * + * This function validates and sets up a pointer to user space memory. + * Only physically contiguous pfn-mapped memory is accepted. + * + * Returns 0 if successful. + */ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, struct videobuf_buffer *vb) {