IB/mlx5: Fix error handling in reg_umr

If ib_post_send fails when posting the UMR work request in reg_umr,
the code doesn't release the temporary pas buffer allocated, and
doesn't dma_unmap it.

Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 81392b2..ad58985 100644 (file)
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -730,7 +730,7 @@ static struct mlx5_ib_mr *reg_umr(struct ib_pd *pd, struct ib_umem *umem,
        struct mlx5_ib_mr *mr;
        struct ib_sge sg;
        int size = sizeof(u64) * npages;
-       int err;
+       int err = 0;
        int i;
 
        for (i = 0; i < 1; i++) {
@@ -751,7 +751,7 @@ static struct mlx5_ib_mr *reg_umr(struct ib_pd *pd, struct ib_umem *umem,
        mr->pas = kmalloc(size + MLX5_UMR_ALIGN - 1, GFP_KERNEL);
        if (!mr->pas) {
                err = -ENOMEM;
-               goto error;
+               goto free_mr;
        }
 
        mlx5_ib_populate_pas(dev, umem, page_shift,
@@ -760,9 +760,8 @@ static struct mlx5_ib_mr *reg_umr(struct ib_pd *pd, struct ib_umem *umem,
        mr->dma = dma_map_single(ddev, mr_align(mr->pas, MLX5_UMR_ALIGN), size,
                                 DMA_TO_DEVICE);
        if (dma_mapping_error(ddev, mr->dma)) {
-               kfree(mr->pas);
                err = -ENOMEM;
-               goto error;
+               goto free_pas;
        }
 
        memset(&wr, 0, sizeof(wr));
@@ -778,26 +777,28 @@ static struct mlx5_ib_mr *reg_umr(struct ib_pd *pd, struct ib_umem *umem,
        err = ib_post_send(umrc->qp, &wr, &bad);
        if (err) {
                mlx5_ib_warn(dev, "post send failed, err %d\n", err);
-               up(&umrc->sem);
-               goto error;
+               goto unmap_dma;
        }
        wait_for_completion(&mr->done);
-       up(&umrc->sem);
+       if (mr->status != IB_WC_SUCCESS) {
+               mlx5_ib_warn(dev, "reg umr failed\n");
+               err = -EFAULT;
+       }
 
+unmap_dma:
+       up(&umrc->sem);
        dma_unmap_single(ddev, mr->dma, size, DMA_TO_DEVICE);
+
+free_pas:
        kfree(mr->pas);
 
-       if (mr->status != IB_WC_SUCCESS) {
-               mlx5_ib_warn(dev, "reg umr failed\n");
-               err = -EFAULT;
-               goto error;
+free_mr:
+       if (err) {
+               free_cached_mr(dev, mr);
+               return ERR_PTR(err);
        }
 
        return mr;
-
-error:
-       free_cached_mr(dev, mr);
-       return ERR_PTR(err);
 }
 
 static struct mlx5_ib_mr *reg_create(struct ib_pd *pd, u64 virt_addr,