linux-kernel - Re: [PATCH v4 1/2] clk: hisilicon: Use correct return value about hisi_reset

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Date:   Fri, 29 May 2020 02:36:06 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH v4 1/2] clk: hisilicon: Use correct return value about hisi_reset_init()

Quoting Tiezhu Yang (2020-05-28 23:44:20)
> On 05/29/2020 12:31 PM, Stephen Boyd wrote:
> > Quoting Tiezhu Yang (2020-05-28 21:02:05)
> > I think you didn't understand my question. I'm asking where is this
> > patch applied to the kernel and what commit is it? I don't see it in the
> > clk tree.
> 
> Sorry for that, actually I do not quite understand what you mean.
> 
> In my opinion, after the following commit,  when devm_ioremap_resource()
> is called in hisi_reset_init(), hisi_reset_init() still returns NULL and 
> it only returns
> -ENOMEM when call hisi_reset_init() failed, I think it may returns 
> -EINVAL, -EBUSY
> or -ENOMEM if failed, this is what I want to fix.
> 
> "reset: hisilicon: fix potential NULL pointer dereference"
> https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/commit/drivers/clk/hisilicon/reset.c?h=clk-next&id=e9a2310fb689151166df7fd9971093362d34bd79
> 

This commit doesn't change the value that is returned by
hisi_reset_init() on an error. It still returns NULL when an error
happens.