[PATCH 2/2] drm/msm: simplify msm_parse_deps() and msm_parse_post_deps()

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Simplify two functions msm_parse_deps() and msm_parse_post_deps():
extract single item parsing function and clean up error path.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
 drivers/gpu/drm/msm/msm_gem_submit.c | 196 +++++++++++++++------------
 1 file changed, 106 insertions(+), 90 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index a539eb31042f..c64907f0f249 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -546,6 +546,46 @@ struct msm_submit_post_dep {
 	struct dma_fence_chain *chain;
 };
 
+static struct drm_syncobj *msm_parse_dep_one(struct msm_gem_submit *submit,
+					     struct drm_file *file,
+					     uint64_t address,
+					     size_t syncobj_stride)
+{
+	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
+	struct dma_fence *fence;
+	struct drm_syncobj *syncobj = NULL;
+	int ret;
+
+	if (copy_from_user(&syncobj_desc,
+			   u64_to_user_ptr(address),
+			   min(syncobj_stride, sizeof(syncobj_desc))))
+		return ERR_PTR(-EFAULT);
+
+	if (syncobj_desc.point &&
+	    !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE))
+		return ERR_PTR(-EOPNOTSUPP);
+
+	if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS)
+		return ERR_PTR(-EINVAL);
+
+	ret = drm_syncobj_find_fence(file, syncobj_desc.handle,
+				     syncobj_desc.point, 0, &fence);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = drm_sched_job_add_dependency(&submit->base, fence);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
+		syncobj = drm_syncobj_find(file, syncobj_desc.handle);
+		if (!syncobj)
+			return ERR_PTR(-EINVAL);
+	}
+
+	return syncobj;
+}
+
 static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
                                            struct drm_file *file,
                                            uint64_t in_syncobjs_addr,
@@ -553,9 +593,8 @@ static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
                                            size_t syncobj_stride)
 {
 	struct drm_syncobj **syncobjs = NULL;
-	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
-	int ret = 0;
-	uint32_t i, j;
+	int ret;
+	int i;
 
 	syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
 	                   GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
@@ -564,54 +603,26 @@ static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
 
 	for (i = 0; i < nr_in_syncobjs; ++i) {
 		uint64_t address = in_syncobjs_addr + i * syncobj_stride;
-		struct dma_fence *fence;
+		struct drm_syncobj *syncobj;
 
-		if (copy_from_user(&syncobj_desc,
-			           u64_to_user_ptr(address),
-			           min(syncobj_stride, sizeof(syncobj_desc)))) {
-			ret = -EFAULT;
-			break;
-		}
-
-		if (syncobj_desc.point &&
-		    !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE)) {
-			ret = -EOPNOTSUPP;
-			break;
+		syncobj = msm_parse_dep_one(submit, file, address, syncobj_stride);
+		if (IS_ERR(syncobj)) {
+			ret = PTR_ERR(syncobj);
+			goto err;
 		}
 
-		if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
-			ret = -EINVAL;
-			break;
-		}
-
-		ret = drm_syncobj_find_fence(file, syncobj_desc.handle,
-		                             syncobj_desc.point, 0, &fence);
-		if (ret)
-			break;
-
-		ret = drm_sched_job_add_dependency(&submit->base, fence);
-		if (ret)
-			break;
-
-		if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
-			syncobjs[i] =
-				drm_syncobj_find(file, syncobj_desc.handle);
-			if (!syncobjs[i]) {
-				ret = -EINVAL;
-				break;
-			}
-		}
+		syncobjs[i] = syncobj;
 	}
 
-	if (ret) {
-		for (j = 0; j <= i; ++j) {
-			if (syncobjs[j])
-				drm_syncobj_put(syncobjs[j]);
-		}
-		kfree(syncobjs);
-		return ERR_PTR(ret);
-	}
 	return syncobjs;
+
+err:
+	while (--i >= 0)
+		if (syncobjs[i])
+			drm_syncobj_put(syncobjs[i]);
+	kfree(syncobjs);
+
+	return ERR_PTR(ret);
 }
 
 static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
@@ -625,6 +636,43 @@ static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
 	}
 }
 
+static int msm_parse_post_dep_one(struct drm_device *dev,
+				  struct drm_file *file,
+				  uint64_t address,
+				  size_t syncobj_stride,
+				  struct msm_submit_post_dep *post_dep)
+{
+	struct msm_submit_post_dep *post_deps;
+	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
+
+	if (copy_from_user(&syncobj_desc,
+			   u64_to_user_ptr(address),
+			   min(syncobj_stride, sizeof(syncobj_desc))))
+		return -EFAULT;
+
+	post_dep->point = syncobj_desc.point;
+
+	if (syncobj_desc.flags)
+		return -EINVAL;
+
+	if (syncobj_desc.point) {
+		if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
+			return -EOPNOTSUPP;
+
+		post_dep->chain = dma_fence_chain_alloc();
+		if (!post_dep->chain)
+			return -ENOMEM;
+	}
+
+	post_dep->syncobj = drm_syncobj_find(file, syncobj_desc.handle);
+	if (!post_dep->syncobj) {
+		dma_fence_chain_free(post_deps->chain);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
                                                        struct drm_file *file,
                                                        uint64_t syncobjs_addr,
@@ -632,9 +680,8 @@ static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
                                                        size_t syncobj_stride)
 {
 	struct msm_submit_post_dep *post_deps;
-	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 	int ret = 0;
-	uint32_t i, j;
+	int i;
 
 	post_deps = kcalloc(nr_syncobjs, sizeof(*post_deps),
 			    GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
@@ -644,54 +691,23 @@ static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
 	for (i = 0; i < nr_syncobjs; ++i) {
 		uint64_t address = syncobjs_addr + i * syncobj_stride;
 
-		if (copy_from_user(&syncobj_desc,
-			           u64_to_user_ptr(address),
-			           min(syncobj_stride, sizeof(syncobj_desc)))) {
-			ret = -EFAULT;
-			break;
-		}
-
-		post_deps[i].point = syncobj_desc.point;
-
-		if (syncobj_desc.flags) {
-			ret = -EINVAL;
-			break;
-		}
-
-		if (syncobj_desc.point) {
-			if (!drm_core_check_feature(dev,
-			                            DRIVER_SYNCOBJ_TIMELINE)) {
-				ret = -EOPNOTSUPP;
-				break;
-			}
-
-			post_deps[i].chain = dma_fence_chain_alloc();
-			if (!post_deps[i].chain) {
-				ret = -ENOMEM;
-				break;
-			}
-		}
-
-		post_deps[i].syncobj =
-			drm_syncobj_find(file, syncobj_desc.handle);
-		if (!post_deps[i].syncobj) {
-			ret = -EINVAL;
-			break;
-		}
+		ret = msm_parse_post_dep_one(dev, file, address, syncobj_stride, &post_deps[i]);
+		if (ret)
+			goto err;
 	}
 
-	if (ret) {
-		for (j = 0; j <= i; ++j) {
-			dma_fence_chain_free(post_deps[j].chain);
-			if (post_deps[j].syncobj)
-				drm_syncobj_put(post_deps[j].syncobj);
-		}
+	return post_deps;
 
-		kfree(post_deps);
-		return ERR_PTR(ret);
+err:
+	while (--i >= 0) {
+		dma_fence_chain_free(post_deps[i].chain);
+		if (post_deps[i].syncobj)
+			drm_syncobj_put(post_deps[i].syncobj);
 	}
 
-	return post_deps;
+	kfree(post_deps);
+
+	return ERR_PTR(ret);
 }
 
 static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
-- 
2.39.1




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