linux-kernel - Re: [PATCH net 9/9] net: qed: fix "maybe uninitialized" warning

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Message-ID: <20200622144437.770e09e0@kicinski-fedora-PC1C0HJN>
Date:   Mon, 22 Jun 2020 14:44:37 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Alexander Lobakin <alobakin@...vell.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Igor Russkikh <irusskikh@...vell.com>,
        Michal Kalderon <michal.kalderon@...vell.com>,
        Ariel Elior <aelior@...vell.com>,
        Yuval Mintz <yuval.mintz@...vell.com>,
        Denis Bolotin <denis.bolotin@...vell.com>,
        "Ram Amrani" <ram.amrani@...vell.com>,
        Tomer Tayar <tomer.tayar@...vell.com>,
        <GR-everest-linux-l2@...vell.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 9/9] net: qed: fix "maybe uninitialized" warning

On Mon, 22 Jun 2020 14:14:13 +0300 Alexander Lobakin wrote:
> Variable 'abs_ppfid' in qed_dev.c:qed_llh_add_mac_filter() always gets
> printed, but is initialized only under 'ref_cnt == 1' condition. This
> results in:
> 
> In file included from ./include/linux/kernel.h:15:0,
>                  from ./include/asm-generic/bug.h:19,
>                  from ./arch/x86/include/asm/bug.h:86,
>                  from ./include/linux/bug.h:5,
>                  from ./include/linux/io.h:11,
>                  from drivers/net/ethernet/qlogic/qed/qed_dev.c:35:
> drivers/net/ethernet/qlogic/qed/qed_dev.c: In function 'qed_llh_add_mac_filter':
> ./include/linux/printk.h:358:2: warning: 'abs_ppfid' may be used uninitialized
> in this function [-Wmaybe-uninitialized]
>   printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
>   ^~~~~~
> drivers/net/ethernet/qlogic/qed/qed_dev.c:983:17: note: 'abs_ppfid' was declared
> here
>   u8 filter_idx, abs_ppfid;
>                  ^~~~~~~~~
> 
> ...under W=1+.
> 
> Fix this by initializing it with zero.
> 
> Fixes: 79284adeb99e ("qed: Add llh ppfid interface and 100g support for
> offload protocols")
> Signed-off-by: Alexander Lobakin <alobakin@...vell.com>
> Signed-off-by: Igor Russkikh <irusskikh@...vell.com>
> Signed-off-by: Michal Kalderon <michal.kalderon@...vell.com>

Please don't wrap Fixes tags:

Fixes tag: Fixes: 79284adeb99e ("qed: Add llh ppfid interface and 100g support for
Has these problem(s):
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