linux-kernel - Re: [RESEBD PATCH v3] bcache: Remove some unnecessary NULL point check for the return value of __bch_btree_node

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Message-ID: <CAJedcCwhtqNTmQ1_P3EDZ+11WiNLOpBdv-k9oP=u4m3-FY-5fQ@mail.gmail.com>
Date:   Sat, 18 Feb 2023 15:06:32 +0800
From:   Zheng Hacker <hackerzheng666@...il.com>
To:     Eric Wheeler <bcache@...ts.ewheeler.net>
Cc:     Zheng Wang <zyytlz.wz@....com>, colyli@...e.de,
        kent.overstreet@...il.com, linux-bcache@...r.kernel.org,
        linux-kernel@...r.kernel.org, alex000young@...il.com,
        stable@...r.kernel.org
Subject: Re: [RESEBD PATCH v3] bcache: Remove some unnecessary NULL point
 check for the return value of __bch_btree_node_alloc-related pointer

Eric Wheeler <bcache@...ts.ewheeler.net> 于2023年2月18日周六 05:57写道：
>
> On Fri, 17 Feb 2023, Zheng Wang wrote:
>
> > Due to the previously fix of __bch_btree_node_alloc, the return value will
> > never be a NULL pointer. So IS_ERR is enough to handle the failure
> >  situation. Fix it by replacing IS_ERR_OR_NULL check to IS_ERR check.
> >
> > Fixes: cafe56359144 ("bcache: A block layer cache")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Zheng Wang <zyytlz.wz@....com>
> > ---
> > v3:
> > - Add Cc: stable@...r.kernel.org suggested by Eric
>
> Make sure that the commit
>         bcache: Fix __bch_btree_node_alloc to make the failure behavior consistent
> is committed _before_ this "Remove some unnecessary NULL point check..."
> patch.

Oh, sorry for my mistake. I forgot to commit the first patch. I'll try
to commit it first.

>
> It would be a good idea to add "this patch depends on `bcache: Fix
> __bch_btree_node_alloc to make the failure behavior consistent`" to the
> commit message so the stable maintainers know.

Yes, I will append that msg in the next version.

Best regargds,
Zheng