linux-kernel - [PATCH 2/9] media: cedrus: Add wrappers around container

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Message-Id: <20180613140714.1686-3-maxime.ripard@bootlin.com>
Date:   Wed, 13 Jun 2018 16:07:07 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     hans.verkuil@...co.com, acourbot@...omium.org,
        sakari.ailus@...ux.intel.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     tfiga@...omium.org, posciak@...omium.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        nicolas.dufresne@...labora.com, jenskuske@...il.com,
        linux-sunxi@...glegroups.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: [PATCH 2/9] media: cedrus: Add wrappers around container_of for our buffers

The cedrus driver sub-classes the vb2_v4l2_buffer structure, but doesn't
provide any function to wrap around the proper container_of call that needs
to be duplicated in every calling site.

Add wrappers to make sure its opaque to the users and they don't have to
care anymore.

Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
---
 .../platform/sunxi/cedrus/sunxi_cedrus_common.h      | 12 ++++++++++++
 .../media/platform/sunxi/cedrus/sunxi_cedrus_hw.c    |  4 ++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
index ee6883ef9cb7..b1ed1c8cb130 100644
--- a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
+++ b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
@@ -89,6 +89,18 @@ struct sunxi_cedrus_buffer {
 	struct list_head list;
 };
 
+static inline
+struct sunxi_cedrus_buffer *vb2_v4l2_to_cedrus_buffer(const struct vb2_v4l2_buffer *p)
+{
+	return container_of(p, struct sunxi_cedrus_buffer, vb);
+}
+
+static inline
+struct sunxi_cedrus_buffer *vb2_to_cedrus_buffer(const struct vb2_buffer *p)
+{
+	return vb2_v4l2_to_cedrus_buffer(to_vb2_v4l2_buffer(p));
+}
+
 struct sunxi_cedrus_dev {
 	struct v4l2_device v4l2_dev;
 	struct video_device vfd;
diff --git a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
index 5783bd985855..fc688a5c1ea3 100644
--- a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
+++ b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
@@ -108,8 +108,8 @@ static irqreturn_t sunxi_cedrus_ve_irq(int irq, void *dev_id)
 		return IRQ_HANDLED;
 	}
 
-	src_buffer = container_of(src_vb, struct sunxi_cedrus_buffer, vb);
-	dst_buffer = container_of(dst_vb, struct sunxi_cedrus_buffer, vb);
+	src_buffer = vb2_v4l2_to_cedrus_buffer(src_vb);
+	dst_buffer = vb2_v4l2_to_cedrus_buffer(dst_vb);
 
 	/* First bit of MPEG_STATUS indicates success. */
 	if (ctx->job_abort || !(status & 0x01))
-- 
2.17.0