linux-kernel - Re: [PATCH AUTOSEL 5.5 383/542] gpio: Fix the no return statement warning

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Date:   Thu, 20 Feb 2020 12:20:09 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Kevin Hao <haokexin@...il.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        kbuild test robot <lkp@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.5 383/542] gpio: Fix the no return statement
 warning

On Sat, Feb 15, 2020 at 08:44:55AM +0800, Kevin Hao wrote:
>On Fri, Feb 14, 2020 at 10:46:15AM -0500, Sasha Levin wrote:
>> From: Kevin Hao <haokexin@...il.com>
>>
>> [ Upstream commit 9c6722d85e92233082da2b3623685bba54d6093e ]
>>
>> In commit 242587616710 ("gpiolib: Add support for the irqdomain which
>> doesn't use irq_fwspec as arg") we have changed the return type of
>> gpiochip_populate_parent_fwspec_twocell/fourcell() from void to void *,
>> but forgot to add a return statement for these two dummy functions.
>> Add "return NULL" to fix the build warnings.
>>
>> Reported-by: kbuild test robot <lkp@...el.com>
>> Signed-off-by: Kevin Hao <haokexin@...il.com>
>> Link: https://lore.kernel.org/r/20200116095003.30324-1-haokexin@gmail.com
>> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>  include/linux/gpio/driver.h | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
>> index e2480ef94c559..5dce9c67a961e 100644
>> --- a/include/linux/gpio/driver.h
>> +++ b/include/linux/gpio/driver.h
>> @@ -553,6 +553,7 @@ static inline void gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *chi
>>  						    unsigned int parent_hwirq,
>>  						    unsigned int parent_type)
>>  {
>> +	return NULL;
>
>Hi Sasha,
>
>This commit shouldn't go to the v5.5.x kernel. This is a fix for the
>commit 242587616710, but that commit doesn't exist in the v5.5.x kernel,
>then it will trigger a build warning due to the wrong returning type.

Now dropped, thank you.

-- 
Thanks,
Sasha