linux-kernel - [PATCH] drm/panfrost: Use drm_gem_dump_map

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Message-Id: <20190513143244.16478-1-steven.price@arm.com>
Date:   Mon, 13 May 2019 15:32:44 +0100
From:   Steven Price <steven.price@....com>
To:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: [PATCH] drm/panfrost: Use drm_gem_dump_map_offset()

panfrost_ioctl_mmap_bo() contains a reimplementation of
drm_gem_dump_map_offset() but with a bug - it allows mapping imported
objects (without going through the exporter). Fix this by switching to
use the generic drm_gem_dump_map_offset() function instead which has the
bonus of simplifying the code.

CC: Alyssa Rosenzweig <alyssa@...enzweig.io>
Signed-off-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 94b0819ad50b..d048250ad8ab 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -254,26 +254,14 @@ static int panfrost_ioctl_mmap_bo(struct drm_device *dev, void *data,
 		      struct drm_file *file_priv)
 {
 	struct drm_panfrost_mmap_bo *args = data;
-	struct drm_gem_object *gem_obj;
-	int ret;
 
 	if (args->flags != 0) {
 		DRM_INFO("unknown mmap_bo flags: %d\n", args->flags);
 		return -EINVAL;
 	}
 
-	gem_obj = drm_gem_object_lookup(file_priv, args->handle);
-	if (!gem_obj) {
-		DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
-		return -ENOENT;
-	}
-
-	ret = drm_gem_create_mmap_offset(gem_obj);
-	if (ret == 0)
-		args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
-	drm_gem_object_put_unlocked(gem_obj);
-
-	return ret;
+	return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
+				       &args->offset);
 }
 
 static int panfrost_ioctl_get_bo_offset(struct drm_device *dev, void *data,
-- 
2.20.1