linux-kernel - [PATCH v4 2/4] drm/vc4: Check for V3D before binner bo alloc

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Message-Id: <20190403154856.9470-3-paul.kocialkowski@bootlin.com>
Date:   Wed,  3 Apr 2019 17:48:54 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Eben Upton <eben@...pberrypi.org>,
        Daniel Stone <daniel@...ishbar.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: [PATCH v4 2/4] drm/vc4: Check for V3D before binner bo alloc

Check that we have a V3D device registered before attempting to
allocate a binner buffer object.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
---
 drivers/gpu/drm/vc4/vc4_drv.h | 1 +
 drivers/gpu/drm/vc4/vc4_v3d.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index e61734af059b..37941f0e212a 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -833,6 +833,7 @@ void vc4_plane_async_set_fb(struct drm_plane *plane,
 extern struct platform_driver vc4_v3d_driver;
 extern const struct of_device_id vc4_v3d_dt_match[];
 int vc4_v3d_get_bin_slot(struct vc4_dev *vc4);
+int vc4_v3d_allocate_bin_bo(struct vc4_dev *vc4);
 int vc4_v3d_pm_get(struct vc4_dev *vc4);
 void vc4_v3d_pm_put(struct vc4_dev *vc4);
 
diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c
index fe091256800d..70204c38074a 100644
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
@@ -241,6 +241,9 @@ int vc4_v3d_allocate_bin_bo(struct vc4_dev *vc4)
 	int ret = 0;
 	struct list_head list;
 
+	if (!v3d)
+		return -ENODEV;
+
 	/* We may need to try allocating more than once to get a BO
 	 * that doesn't cross 256MB.  Track the ones we've allocated
 	 * that failed so far, so that we can free them when we've got
-- 
2.21.0