linux-kernel - Re: [PATCH net] linux/dim: Do nothing if no time delta between samples

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Message-ID: <20230508061307.GB6195@unreal>
Date:   Mon, 8 May 2023 09:13:07 +0300
From:   Leon Romanovsky <leonro@...dia.com>
To:     Tariq Toukan <tariqt@...dia.com>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        John Fastabend <john.fastabend@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "Paolo Abeni" <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Gal Pressman <gal@...dia.com>, Tal Gilboa <talgi@...dia.com>,
        Roy Novich <royno@...dia.com>, Aya Levin <ayal@...dia.com>
Subject: Re: [PATCH net] linux/dim: Do nothing if no time delta between
 samples

On Sun, May 07, 2023 at 04:57:43PM +0300, Tariq Toukan wrote:
> From: Roy Novich <royno@...dia.com>
> 
> Add return value for dim_calc_stats. This is an indication for the
> caller if curr_stats was assigned by the function. Avoid using
> curr_stats uninitialized over {rdma/net}_dim, when no time delta between
> samples. Coverity reported this potential use of an uninitialized
> variable.
> 
> Fixes: 4c4dbb4a7363 ("net/mlx5e: Move dynamic interrupt coalescing code to include/linux")
> Fixes: cb3c7fd4f839 ("net/mlx5e: Support adaptive RX coalescing")
> Signed-off-by: Roy Novich <royno@...dia.com>
> Reviewed-by: Aya Levin <ayal@...dia.com>
> Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
> Signed-off-by: Tariq Toukan <tariqt@...dia.com>
> ---
>  include/linux/dim.h | 3 ++-
>  lib/dim/dim.c       | 5 +++--
>  lib/dim/net_dim.c   | 3 ++-
>  lib/dim/rdma_dim.c  | 3 ++-
>  4 files changed, 9 insertions(+), 5 deletions(-)
> 

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