From patchwork Fri Dec 13 12:54:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Brezillon X-Patchwork-Id: 11290491 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C8E8B18B6 for ; Fri, 13 Dec 2019 20:36:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 872AE2474C for ; Fri, 13 Dec 2019 20:36:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727177AbfLMMyW (ORCPT ); Fri, 13 Dec 2019 07:54:22 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:57140 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727127AbfLMMyV (ORCPT ); Fri, 13 Dec 2019 07:54:21 -0500 Received: from localhost.localdomain (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id B7C57292CC6; Fri, 13 Dec 2019 12:54:19 +0000 (GMT) From: Boris Brezillon To: Mauro Carvalho Chehab , Hans Verkuil , Laurent Pinchart , Sakari Ailus , linux-media@vger.kernel.org Cc: Rob Herring , Mark Rutland , devicetree@vger.kernel.org, Tomasz Figa , Nicolas Dufresne , kernel@collabora.com, Paul Kocialkowski , Ezequiel Garcia , Jonas Karlman , linux-rockchip@lists.infradead.org, Heiko Stuebner , Boris Brezillon Subject: [PATCH v3 1/7] media: vb2: Add a helper to get the vb2 buffer attached to a request Date: Fri, 13 Dec 2019 13:54:08 +0100 Message-Id: <20191213125414.90725-2-boris.brezillon@collabora.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191213125414.90725-1-boris.brezillon@collabora.com> References: <20191213125414.90725-1-boris.brezillon@collabora.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org vb2_request_get_buf() returns the N-th buffer attached to a media request. Signed-off-by: Boris Brezillon --- Changes in v3: * None Changes in v2: * Adjust the kernel doc as suggested by Hans --- .../media/common/videobuf2/videobuf2-core.c | 23 +++++++++++++++++++ include/media/videobuf2-core.h | 11 +++++++++ 2 files changed, 34 insertions(+) diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 4489744fbbd9..c4c7980dcb0d 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -1416,6 +1416,29 @@ unsigned int vb2_request_buffer_cnt(struct media_request *req) } EXPORT_SYMBOL_GPL(vb2_request_buffer_cnt); +struct vb2_buffer *vb2_request_get_buf(struct media_request *req, + unsigned int n) +{ + struct media_request_object *obj; + struct vb2_buffer *buf = NULL; + unsigned int nbufs = 0; + unsigned long flags; + + spin_lock_irqsave(&req->lock, flags); + list_for_each_entry(obj, &req->objects, list) { + if (!vb2_request_object_is_buffer(obj) || + nbufs++ < n) + continue; + + buf = container_of(obj, struct vb2_buffer, req_obj); + break; + } + spin_unlock_irqrestore(&req->lock, flags); + + return buf; +} +EXPORT_SYMBOL_GPL(vb2_request_get_buf); + int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb) { struct vb2_buffer *vb; diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index a2b2208b02da..6206e25df764 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -1225,4 +1225,15 @@ bool vb2_request_object_is_buffer(struct media_request_object *obj); */ unsigned int vb2_request_buffer_cnt(struct media_request *req); +/** + * vb2_request_get_buf() - return the buffer at index @idx + * + * @req: the request. + * @n: search for the Nth buffer in the req object list + * + * Return a vb2 buffer or NULL if there's no buffer at the specified position + */ +struct vb2_buffer *vb2_request_get_buf(struct media_request *req, + unsigned int n); + #endif /* _MEDIA_VIDEOBUF2_CORE_H */