diff options
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_g2d.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 6c1885eedfdf..800158714473 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -467,14 +467,17 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev, goto err_free; } + down_read(¤t->mm->mmap_sem); vma = find_vma(current->mm, userptr); if (!vma) { + up_read(¤t->mm->mmap_sem); DRM_ERROR("failed to get vm region.\n"); ret = -EFAULT; goto err_free_pages; } if (vma->vm_end < userptr + size) { + up_read(¤t->mm->mmap_sem); DRM_ERROR("vma is too small.\n"); ret = -EFAULT; goto err_free_pages; @@ -482,6 +485,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev, g2d_userptr->vma = exynos_gem_get_vma(vma); if (!g2d_userptr->vma) { + up_read(¤t->mm->mmap_sem); DRM_ERROR("failed to copy vma.\n"); ret = -ENOMEM; goto err_free_pages; @@ -492,10 +496,12 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev, ret = exynos_gem_get_pages_from_userptr(start & PAGE_MASK, npages, pages, vma); if (ret < 0) { + up_read(¤t->mm->mmap_sem); DRM_ERROR("failed to get user pages from userptr.\n"); goto err_put_vma; } + up_read(¤t->mm->mmap_sem); g2d_userptr->pages = pages; sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); |