drm/exynos: fixed page align and code clean.

1M section, 64k page count also should be rounded up so this patch
rounds up them and caculates page count of them properly and also
checks memory flags from user.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

1 files changed, 36 insertions, 9 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index fa1aa94a3d8e..26d51979116b 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -56,9 +56,28 @@ static unsigned int convert_to_vm_err_msg(int msg)
 	return out_msg;
 }
 
-static unsigned int mask_gem_flags(unsigned int flags)
+static int check_gem_flags(unsigned int flags)
 {
-	return flags &= EXYNOS_BO_NONCONTIG;
+	if (flags & ~(EXYNOS_BO_MASK)) {
+		DRM_ERROR("invalid flags.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
+{
+	if (!IS_NONCONTIG_BUFFER(flags)) {
+		if (size >= SZ_1M)
+			return roundup(size, SECTION_SIZE);
+		else if (size >= SZ_64K)
+			return roundup(size, SZ_64K);
+		else
+			goto out;
+	}
+out:
+	return roundup(size, PAGE_SIZE);
 }
 
 static struct page **exynos_gem_get_pages(struct drm_gem_object *obj,
@@ -319,10 +338,17 @@ struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
 	struct exynos_drm_gem_buf *buf;
 	int ret;
 
-	size = roundup(size, PAGE_SIZE);
-	DRM_DEBUG_KMS("%s: size = 0x%lx\n", __FILE__, size);
+	if (!size) {
+		DRM_ERROR("invalid size.\n");
+		return ERR_PTR(-EINVAL);
+	}
 
-	flags = mask_gem_flags(flags);
+	size = roundup_gem_size(size, flags);
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	ret = check_gem_flags(flags);
+	if (ret)
+		return ERR_PTR(ret);
 
 	buf = exynos_drm_init_buf(dev, size);
 	if (!buf)
@@ -331,7 +357,7 @@ struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
 	exynos_gem_obj = exynos_drm_gem_init(dev, size);
 	if (!exynos_gem_obj) {
 		ret = -ENOMEM;
-		goto err;
+		goto err_fini_buf;
 	}
 
 	exynos_gem_obj->buffer = buf;
@@ -347,18 +373,19 @@ struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
 		ret = exynos_drm_gem_get_pages(&exynos_gem_obj->base);
 		if (ret < 0) {
 			drm_gem_object_release(&exynos_gem_obj->base);
-			goto err;
+			goto err_fini_buf;
 		}
 	} else {
 		ret = exynos_drm_alloc_buf(dev, buf, flags);
 		if (ret < 0) {
 			drm_gem_object_release(&exynos_gem_obj->base);
-			goto err;
+			goto err_fini_buf;
 		}
 	}
 
 	return exynos_gem_obj;
-err:
+
+err_fini_buf:
 	exynos_drm_fini_buf(dev, buf);
 	return ERR_PTR(ret);
 }