[PATCH v7] gpudev: manage NULL pointer

[eagostini at nvidia.com]

From: Elena Agostini <eagostini at nvidia.com>

gpudev free and unregister functions return
gracefully if input pointer is NULL because
API doc was indicating NULL as a no-op
accepted value.

cuda driver checks are removed because
redundant with the checks added
in gpudev library.

Fixes: e818c4e2bf50 ("gpudev: add memory API")

Signed-off-by: Elena Agostini <eagostini at nvidia.com>
---
 drivers/gpu/cuda/cuda.c | 11 -----------
 lib/gpudev/gpudev.c     | 12 ++++++++++--
 2 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/cuda/cuda.c b/drivers/gpu/cuda/cuda.c
index 24ae630d04..a4869da186 100644
--- a/drivers/gpu/cuda/cuda.c
+++ b/drivers/gpu/cuda/cuda.c
@@ -569,8 +569,6 @@ cuda_mem_alloc(struct rte_gpu *dev, size_t size, void **ptr)
 
 	if (dev == NULL)
 		return -ENODEV;
-	if (size == 0)
-		return -EINVAL;
 
 	/* Store current ctx */
 	res = pfn_cuCtxGetCurrent(&current_ctx);
@@ -652,9 +650,6 @@ cuda_mem_register(struct rte_gpu *dev, size_t size, void *ptr)
 	if (dev == NULL)
 		return -ENODEV;
 
-	if (size == 0 || ptr == NULL)
-		return -EINVAL;
-
 	/* Store current ctx */
 	res = pfn_cuCtxGetCurrent(&current_ctx);
 	if (res != 0) {
@@ -764,9 +759,6 @@ cuda_mem_free(struct rte_gpu *dev, void *ptr)
 	if (dev == NULL)
 		return -ENODEV;
 
-	if (ptr == NULL)
-		return -EINVAL;
-
 	hk = get_hash_from_ptr((void *)ptr);
 
 	mem_item = mem_list_find_item(hk);
@@ -803,9 +795,6 @@ cuda_mem_unregister(struct rte_gpu *dev, void *ptr)
 	if (dev == NULL)
 		return -ENODEV;
 
-	if (ptr == NULL)
-		return -EINVAL;
-
 	hk = get_hash_from_ptr((void *)ptr);
 
 	mem_item = mem_list_find_item(hk);
diff --git a/lib/gpudev/gpudev.c b/lib/gpudev/gpudev.c
index 2b174d8bd5..1d8200e71b 100644
--- a/lib/gpudev/gpudev.c
+++ b/lib/gpudev/gpudev.c
@@ -580,6 +580,10 @@ rte_gpu_mem_free(int16_t dev_id, void *ptr)
 		rte_errno = ENOTSUP;
 		return -rte_errno;
 	}
+
+	if (ptr == NULL) /* dry-run */
+		return 0;
+
 	return GPU_DRV_RET(dev->ops.mem_free(dev, ptr));
 }
 
@@ -601,8 +605,8 @@ rte_gpu_mem_register(int16_t dev_id, size_t size, void *ptr)
 		return -rte_errno;
 	}
 
-	if (size == 0 || ptr == NULL) /* dry-run */
-		return -EINVAL;
+	if (ptr == NULL || size == 0) /* dry-run  */
+		return 0;
 
 	return GPU_DRV_RET(dev->ops.mem_register(dev, size, ptr));
 }
@@ -623,6 +627,10 @@ rte_gpu_mem_unregister(int16_t dev_id, void *ptr)
 		rte_errno = ENOTSUP;
 		return -rte_errno;
 	}
+
+	if (ptr == NULL) /* dry-run */
+		return 0;
+
 	return GPU_DRV_RET(dev->ops.mem_unregister(dev, ptr));
 }
 
-- 
2.17.1