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path: root/drivers/gpu/drm/exynos/exynos_drm_g2d.c
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Diffstat (limited to 'drivers/gpu/drm/exynos/exynos_drm_g2d.c')
-rw-r--r--drivers/gpu/drm/exynos/exynos_drm_g2d.c6
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(&current->mm->mmap_sem);
vma = find_vma(current->mm, userptr);
if (!vma) {
+ up_read(&current->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(&current->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(&current->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(&current->mm->mmap_sem);
DRM_ERROR("failed to get user pages from userptr.\n");
goto err_put_vma;
}
+ up_read(&current->mm->mmap_sem);
g2d_userptr->pages = pages;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);