linux-kernel - Re: [PATCH v2] net/mlx5e: Refactor switch statements to avoid using uninitialized variables

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Message-ID: <20190710052219.GC7034@mtr-leonro.mtl.com>
Date:   Wed, 10 Jul 2019 08:22:19 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Boris Pismenny <borisp@...lanox.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2] net/mlx5e: Refactor switch statements to avoid using
 uninitialized variables

On Tue, Jul 09, 2019 at 09:47:49PM -0700, Nathan Chancellor wrote:
> clang warns:
>
> drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:251:2:
> warning: variable 'rec_seq_sz' is used uninitialized whenever switch
> default is taken [-Wsometimes-uninitialized]
>         default:
>         ^~~~~~~
> drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:255:46: note:
> uninitialized use occurs here
>         skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
>                                                     ^~~~~~~~~~
> drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:239:16: note:
> initialize the variable 'rec_seq_sz' to silence this warning
>         u16 rec_seq_sz;
>                       ^
>                        = 0
> 1 warning generated.
>
> The default case statement should return in tx_post_resync_params like
> in fill_static_params_ctx. However, as Nick and Leon point out, the
> switch statements converted into if statements to clean up the code a
> bit since there is only one cipher supported. Do that to clear up the
> code.
>
> Fixes: d2ead1f360e8 ("net/mlx5e: Add kTLS TX HW offload support")
> Link: https://github.com/ClangBuiltLinux/linux/issues/590
> Suggested-by: Leon Romanovsky <leon@...nel.org>
> Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>
> v1 -> v2:
>
> * Refactor switch statements into if statements
>
>  .../mellanox/mlx5/core/en_accel/ktls_tx.c     | 33 +++++++------------
>  1 file changed, 11 insertions(+), 22 deletions(-)
>

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>