From patchwork Fri Jun 19 11:50:07 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 6644451 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B4399C0020 for ; Fri, 19 Jun 2015 11:49:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 101902096F for ; Fri, 19 Jun 2015 11:49:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F03252096B for ; Fri, 19 Jun 2015 11:49:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751809AbbFSLt0 (ORCPT ); Fri, 19 Jun 2015 07:49:26 -0400 Received: from galahad.ideasonboard.com ([185.26.127.97]:39719 "EHLO galahad.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751792AbbFSLtV (ORCPT ); Fri, 19 Jun 2015 07:49:21 -0400 Received: from avalon.home (a91-152-136-245.elisa-laajakaista.fi [91.152.136.245]) by galahad.ideasonboard.com (Postfix) with ESMTPSA id 86216216A1; Fri, 19 Jun 2015 13:48:19 +0200 (CEST) From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: Hans Verkuil , Kamil Debski , Marek Szyprowski Subject: [URGENT] [PATCH] vb2: Don't WARN when v4l2_buffer.bytesused is 0 for multiplanar buffers Date: Fri, 19 Jun 2015 14:50:07 +0300 Message-Id: <1434714607-31447-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.3.6 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-7.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Commit f61bf13b6a07 ("[media] vb2: add allow_zero_bytesused flag to the vb2_queue struct") added a WARN_ONCE to catch usage of a deprecated API using a zero value for v4l2_buffer.bytesused. However, the condition is checked incorrectly, as the v4L2_buffer bytesused field is supposed to be ignored for multiplanar buffers. This results in spurious warnings when using the multiplanar API. Fix it by checking v4l2_buffer.bytesused for uniplanar buffers and v4l2_plane.bytesused for multiplanar buffers. Fixes: f61bf13b6a07 ("[media] vb2: add allow_zero_bytesused flag to the vb2_queue struct") Signed-off-by: Laurent Pinchart --- drivers/media/v4l2-core/videobuf2-core.c | 33 ++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-) The bug was introduced in v4.1-rc1. It would be quite bad if it made it to v4.1 as many users will start complaining. diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index d835814a24d4..93b315459098 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -1242,6 +1242,23 @@ void vb2_discard_done(struct vb2_queue *q) } EXPORT_SYMBOL_GPL(vb2_discard_done); +static void vb2_warn_zero_bytesused(struct vb2_buffer *vb) +{ + static bool __check_once __read_mostly; + + if (__check_once) + return; + + __check_once = true; + __WARN(); + + pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n"); + if (vb->vb2_queue->allow_zero_bytesused) + pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); + else + pr_warn_once("use the actual size instead.\n"); +} + /** * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a * v4l2_buffer by the userspace. The caller has already verified that struct @@ -1252,16 +1269,6 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b { unsigned int plane; - if (V4L2_TYPE_IS_OUTPUT(b->type)) { - if (WARN_ON_ONCE(b->bytesused == 0)) { - pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n"); - if (vb->vb2_queue->allow_zero_bytesused) - pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); - else - pr_warn_once("use the actual size instead.\n"); - } - } - if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { if (b->memory == V4L2_MEMORY_USERPTR) { for (plane = 0; plane < vb->num_planes; ++plane) { @@ -1302,6 +1309,9 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b struct v4l2_plane *pdst = &v4l2_planes[plane]; struct v4l2_plane *psrc = &b->m.planes[plane]; + if (psrc->bytesused == 0) + vb2_warn_zero_bytesused(vb); + if (vb->vb2_queue->allow_zero_bytesused) pdst->bytesused = psrc->bytesused; else @@ -1336,6 +1346,9 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b } if (V4L2_TYPE_IS_OUTPUT(b->type)) { + if (b->bytesused == 0) + vb2_warn_zero_bytesused(vb); + if (vb->vb2_queue->allow_zero_bytesused) v4l2_planes[0].bytesused = b->bytesused; else