[PATCH rdma-next 2/4] RDMA/mlx4: use kzalloc() for the fast registration page list

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@nvidia.com>

mlx4_alloc_priv_pages() allocates a zeroed, page-sized buffer for a
DMA-to-device page list. kmalloc() provides the required physical
contiguity, and a PAGE_SIZE allocation retains the alignment needed to
keep the list within one page.

Use kzalloc() for the buffer and kfree() on the error and teardown paths.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/infiniband/hw/mlx4/mr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c
index 761e2c05dd0f..a6b4abce1bfe 100644
--- a/drivers/infiniband/hw/mlx4/mr.c
+++ b/drivers/infiniband/hw/mlx4/mr.c
@@ -313,7 +313,7 @@ mlx4_alloc_priv_pages(struct ib_device *device,
 				    MLX4_MR_PAGES_ALIGN);
 
 	/* Prevent cross page boundary allocation. */
-	mr->pages = (__be64 *)get_zeroed_page(GFP_KERNEL);
+	mr->pages = kzalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!mr->pages)
 		return -ENOMEM;
 
@@ -328,7 +328,7 @@ mlx4_alloc_priv_pages(struct ib_device *device,
 	return 0;
 
 err:
-	free_page((unsigned long)mr->pages);
+	kfree(mr->pages);
 	return ret;
 }
 
@@ -340,7 +340,7 @@ mlx4_free_priv_pages(struct mlx4_ib_mr *mr)
 
 		dma_unmap_single(device->dev.parent, mr->page_map,
 				 mr->page_map_size, DMA_TO_DEVICE);
-		free_page((unsigned long)mr->pages);
+		kfree(mr->pages);
 		mr->pages = NULL;
 	}
 }

-- 
2.55.0