From 86c5b359d9e10b21eac1f936c498d8a81aa4373f Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 4 Feb 2019 19:38:58 +0100
Subject: [PATCH] drm/bochs: fix bochs_gem_prime_mmap
ttm_fbdev_mmap() just doesn't work. It appears to work fine, mmap()
returns success, but any attempt to actually access the mapping causes a
SIGBUS.
We can just use drm_gem_prime_mmap() instead. Almost. We have to copy
over the start offset from the ttm_buffer_object vm_node to the
drm_gem_object vm_node so the offset math in drm_gem_prime_mmap() works
correctly for us even though we use ttm to manage our objects.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20190204183858.8976-1-kraxel@redhat.com
---
drivers/gpu/drm/bochs/bochs_mm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index 641a33f134eeb..49463348a07aa 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -442,5 +442,6 @@ int bochs_gem_prime_mmap(struct drm_gem_object *obj,
{
struct bochs_bo *bo = gem_to_bochs_bo(obj);
- return ttm_fbdev_mmap(vma, &bo->bo);
+ bo->gem.vma_node.vm_node.start = bo->bo.vma_node.vm_node.start;
+ return drm_gem_prime_mmap(obj, vma);
}
--
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