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From: Boris Brezillon <boris.brezillon@collabora.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>,
	Hans Verkuil <hans.verkuil@cisco.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	linux-media@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, Tomasz Figa <tfiga@chromium.org>,
	Nicolas Dufresne <nicolas@ndufresne.ca>,
	kernel@collabora.com,
	Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	Ezequiel Garcia <ezequiel@collabora.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	linux-rockchip@lists.infradead.org,
	Heiko Stuebner <heiko@sntech.de>,
	Boris Brezillon <boris.brezillon@collabora.com>
Subject: [RESEND PATCH v2 1/4] media: vb2: Add a helper to get the vb2 buffer attached to a request
Date: Fri, 11 Oct 2019 11:33:39 +0200
Message-ID: <20191011093342.3471-2-boris.brezillon@collabora.com> (raw)
In-Reply-To: <20191011093342.3471-1-boris.brezillon@collabora.com>

vb2_request_get_buf() returns the N-th buffer attached to a media
request.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
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 640aabe69450..d363476712dd 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -1222,4 +1222,15 @@ 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 */
-- 
2.21.0


  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11  9:33 [RESEND PATCH v2 0/4] media: rockchip: Add the rkvdec driver Boris Brezillon
2019-10-11  9:33 ` Boris Brezillon [this message]
2019-10-11  9:33 ` [RESEND PATCH v2 2/4] media: dt-bindings: rockchip: Document RK3399 Video Decoder bindings Boris Brezillon
2019-10-11 12:50   ` Rob Herring
2019-10-11 12:56     ` Boris Brezillon
2019-10-11 17:37       ` Rob Herring
2019-10-11  9:33 ` [RESEND PATCH v2 3/4] media: rockchip: Add the rkvdec driver Boris Brezillon
2019-10-11 10:06   ` Hans Verkuil
2019-10-11 11:15     ` Boris Brezillon
2019-10-11 11:21       ` Hans Verkuil
2019-10-13 19:08   ` kbuild test robot
2019-10-13 19:08   ` [RFC PATCH] media: rockchip: rkvdec_queue_ops can be static kbuild test robot
2019-10-11  9:33 ` [RESEND PATCH v2 4/4] arm64: dts: rockchip: rk3399: Define the rockchip Video Decoder node Boris Brezillon
2019-10-11  9:43 ` [RESEND PATCH v2 0/4] media: rockchip: Add the rkvdec driver Hans Verkuil
2019-10-11  9:53   ` Boris Brezillon

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