From mboxrd@z Thu Jan 1 00:00:00 1970 From: orjan.eide@arm.com (=?UTF-8?q?=C3=98rjan=20Eide?=) Date: Thu, 16 Apr 2015 16:41:51 +0200 Subject: [PATCH 1/2] drm: rockchip: Don't pass DRM fake offset to dma-api Message-ID: <1429195312-25898-1-git-send-email-orjan.eide@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Set vm_pgoff to 0 after using it to look up the GEM node, before passing it on rockchip_gem_mmap_buf() where the offset must be from the start of the buffer. Passing in the fake offset currently works because the dma_mmap_attrs implementation that is used for this device, arm_iommu_mmap_attrs, ignores the offset completely. Signed-off-by: ?rjan Eide --- drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index 7ca8799e..69f01c3 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c @@ -94,6 +94,11 @@ int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma) return -EACCES; } + /* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the + * whole buffer from the start. + */ + vma->vm_pgoff = 0; + obj = container_of(node, struct drm_gem_object, vma_node); ret = rockchip_gem_mmap_buf(obj, vma); -- 1.9.1