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

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Message-ID: <f11b46d7-0d94-b4b3-350a-19e5a98d5289@loongson.cn>
Date:   Fri, 29 May 2020 18:20:11 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
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()

On 05/29/2020 05:36 PM, Stephen Boyd wrote:
> 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.

Yes, I agree, but after this commit e9a2310fb689 ("reset:
hisilicon: fix potential NULL pointer dereference"), the
return value of hisi_reset_init() is not so correct because
it replaces devm_ioremap() with devm_ioremap_resource().

Do you think the code of this patch is OK but the "Fixes:" commit
is not accurate? If so, can we remove the "Fixes:" tag?