netdev - Re: [patch net-next 0/8] Add support for pipeline debug (dpipe)

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Date:   Tue, 28 Mar 2017 09:42:58 +0200
From:   Ivan Vecera <ivecera@...hat.com>
To:     Jiri Pirko <jiri@...nulli.us>, David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, arkadis@...lanox.com, idosch@...lanox.com,
        mlxsw@...lanox.com, jhs@...atatu.com, roopa@...ulusnetworks.com,
        f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
        john.fastabend@...il.com, andrew@...n.ch,
        simon.horman@...ronome.com
Subject: Re: [patch net-next 0/8] Add support for pipeline debug (dpipe)

Dne 28.3.2017 v 09:10 Jiri Pirko napsal(a):
> Tue, Mar 28, 2017 at 12:48:34AM CEST, davem@...emloft.net wrote:
>>
>> Please fix up these warnings and resubmit:
>>
>> drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c: In function ‘mlxsw_sp_rif_counter_free’:
>> drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:208:2: warning: ‘p_counter_index’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>>  mlxsw_sp_rif_counter_edit(mlxsw_sp, rif->rif_index,
>>  ^
>
> This is I believe also gcc bug. Code looks fine. I'm not getting the warning
> with gcc 6
>
No it is not a gcc bug. The function mlxsw_sp_rif_counter_free() is not static 
so the compiler cannot know all its callers and so 'dir' parameter can be 
theoretically anything.
You call mlxsw_sp_rif_p_counter_get() there it assumes dir can be only 
MLXSW_SP_RIF_COUNTER_EGRESS or MLXSW_SP_RIF_COUNTER_INGRESS so initializes 
*pp_counter_index only for them. For any other value the value is uninitialized.

Ivan