2021-05-06 18:09:21

by Yang Li

Subject: [PATCH] RDMA/mlx5: Remove redundant assignment to ret

Variable 'ret' is set to the rerurn value of function
mlx5_mr_cache_alloc() but this value is never read as it is
overwritten with a new value later on, hence it is a redundant
assignment and can be removed

Clean up the following clang-analyzer warning:

drivers/infiniband/hw/mlx5/odp.c:421:2: warning: Value stored to 'ret'
is never read [clang-analyzer-deadcode.DeadStores]

Reported-by: Abaci Robot <[email protected]>
Signed-off-by: Yang Li <[email protected]>
---
drivers/infiniband/hw/mlx5/odp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 782b2af..87fa0b2 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -418,7 +418,7 @@ static struct mlx5_ib_mr *implicit_get_child_mr(struct mlx5_ib_mr *imr,
if (IS_ERR(odp))
return ERR_CAST(odp);

- ret = mr = mlx5_mr_cache_alloc(
+ mr = mlx5_mr_cache_alloc(
mr_to_mdev(imr), MLX5_IMR_MTT_CACHE_ENTRY, imr->access_flags);
if (IS_ERR(mr)) {
ib_umem_odp_release(odp);
--
1.8.3.1

2021-05-06 18:12:13

by Leon Romanovsky

Subject: Re: [PATCH] RDMA/mlx5: Remove redundant assignment to ret

On Thu, May 06, 2021 at 06:13:21PM +0800, Yang Li wrote:
> Variable 'ret' is set to the rerurn value of function
> mlx5_mr_cache_alloc() but this value is never read as it is
> overwritten with a new value later on, hence it is a redundant
> assignment and can be removed
>
> Clean up the following clang-analyzer warning:
>
> drivers/infiniband/hw/mlx5/odp.c:421:2: warning: Value stored to 'ret'
> is never read [clang-analyzer-deadcode.DeadStores]
>
> Reported-by: Abaci Robot <[email protected]>
> Signed-off-by: Yang Li <[email protected]>
> ---
> drivers/infiniband/hw/mlx5/odp.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>

Fixes: e6fb246ccafb ("RDMA/mlx5: Consolidate MR destruction to mlx5_ib_dereg_mr()")

Thanks,
Reviewed-by: Leon Romanovsky <[email protected]>

2021-05-11 19:39:28

by Jason Gunthorpe

Subject: Re: [PATCH] RDMA/mlx5: Remove redundant assignment to ret

On Thu, May 06, 2021 at 06:13:21PM +0800, Yang Li wrote:
> Variable 'ret' is set to the rerurn value of function
> mlx5_mr_cache_alloc() but this value is never read as it is
> overwritten with a new value later on, hence it is a redundant
> assignment and can be removed
>
> Clean up the following clang-analyzer warning:
>
> drivers/infiniband/hw/mlx5/odp.c:421:2: warning: Value stored to 'ret'
> is never read [clang-analyzer-deadcode.DeadStores]
>
> Reported-by: Abaci Robot <[email protected]>
> Signed-off-by: Yang Li <[email protected]>
> Reviewed-by: Leon Romanovsky <[email protected]>
> ---
> drivers/infiniband/hw/mlx5/odp.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

Applied to for-next, thanks

Jason