linux-kernel - Re: [PATCH] ath10k: fix the status check and wrong return

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Date:   Tue, 18 Aug 2020 12:08:42 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Tang Bin <tangbin@...s.chinamobile.com>
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        davem@...emloft.net, ath10k@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ath10k: fix the status check and wrong return

Tang Bin <tangbin@...s.chinamobile.com> writes:

> 在 2020/8/17 22:26, Kalle Valo 写道:
>>> In the function ath10k_ahb_clock_init(), devm_clk_get() doesn't
>>> return NULL. Thus use IS_ERR() and PTR_ERR() to validate
>>> the returned value instead of IS_ERR_OR_NULL().
>> Why? What's the benefit of this patch? Or what harm does
>> IS_ERR_OR_NULL() create?
>
> Thanks for you reply, the benefit of this patch is simplify the code,
> because in
>
> this function, I don't think the situation of 'devm_clk_get() return
> NULL' exists.
>
> So please think about it, thanks.

I think you missed my comment below:

>> devm_clk_get() can return NULL if CONFIG_HAVE_CLK is disabled:
>>
>> static inline struct clk *devm_clk_get(struct device *dev, const char *id)
>> {
>> 	return NULL;
>> }

So I think this patch just creates a new bug and does not improve
anything.

-- 
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