linux-kernel - Re: [4.2-rc1][PATCH] gpio: omap: add missed spin_unlock_irqrestore in omap_gpio_irq

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Date:	Fri, 7 Aug 2015 10:34:44 +0300
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Tony Lindgren <tony@...mide.com>,
	Linus Walleij <linus.walleij@...aro.org>
CC:	Alexandre Courbot <gnurou@...il.com>, Sekhar Nori <nsekhar@...com>,
	Javier Martinez Canillas <javier@...hile0.org>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grygorii Strashko <grygorii.strashko@...aro.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [4.2-rc1][PATCH] gpio: omap: add missed spin_unlock_irqrestore
 in omap_gpio_irq_type

Hi Tony,
On 08/07/2015 06:36 AM, Tony Lindgren wrote:
> * Linus Walleij <linus.walleij@...aro.org> [150716 01:38]:
>> On Wed, Jun 24, 2015 at 4:54 PM, Grygorii Strashko
>> <grygorii.strashko@...com> wrote:
>>
>>> From: Grygorii Strashko <grygorii.strashko@...aro.org>
>>>
>>> Add missed spin_unlock_irqrestore in omap_gpio_irq_type when
>>> omap_set_gpio_triggering() is failed.
>>>
>>> It fixes static checker warning:
>>>
>>>          drivers/gpio/gpio-omap.c:523 omap_gpio_irq_type()
>>>          warn: inconsistent returns 'spin_lock:&bank->lock'.
>>>
>>> This fixes commit:
>>> 1562e4618ded ('gpio: omap: fix error handling in omap_gpio_irq_type')
>>>
>>> Reported-by: Javier Martinez Canillas <javier@...hile0.org>
>>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...aro.org>
>>
>> Patch applied for fixes.
>
> Linus, looks like we now have a new build warning in Linux next
> with the fixes and raw_spinlock_t change, so a merge or a commit
> is needed. If you prefer a patch, here's one below.

Yes. It seems merge/rebase issue between fixes & next:
- this patch went through fixes and RAW spinlock conversation
patch through -next, and without merge conflicts.

and patch has been posted already by Axel Lin:
http://www.spinics.net/lists/linux-omap/msg121031.html


>
> 8< ---------------
> From: Tony Lindgren <tony@...mide.com>
> Date: Thu, 6 Aug 2015 20:32:24 -0700
> Subject: [PATCH] gpio: omap: Fix build warning for raw_spinlock_t conversion
>   and unlock fix
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> Looks like we now have a new build warning in Linux next with fix
> 977bd8a94c40 ("gpio: omap: add missed spin_unlock_irqrestore in
> omap_gpio_irq_type") and raw_spinlock changes done in commit
> 4dbada2be460 ("gpio: omap: use raw locks for locking"):
>
> drivers/gpio/gpio-omap.c: In function ‘omap_gpio_irq_type’:
> drivers/gpio/gpio-omap.c:504:26: warning: passing argument 1 of
> ‘spin_unlock_irqrestore’ from incompatible pointer type
> [-Wincompatible-pointer-types]
>     spin_unlock_irqrestore(&bank->lock, flags);
>                            ^
> In file included from include/linux/seqlock.h:35:0,
>                   from include/linux/time.h:5,
>                   from include/linux/stat.h:18,
>                   from include/linux/module.h:10,
>                   from drivers/gpio/gpio-omap.c:16:
> include/linux/spinlock.h:370:122: note: expected
> ‘spinlock_t * {aka struct spinlock *}’ but argument is of type
> ‘raw_spinlock_t * {aka struct raw_spinlock *}’
>
> Fix the issue with using raw_spinlock_t instead.
>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
>
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -501,7 +501,7 @@ static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
>   	raw_spin_lock_irqsave(&bank->lock, flags);
>   	retval = omap_set_gpio_triggering(bank, offset, type);
>   	if (retval) {
> -		spin_unlock_irqrestore(&bank->lock, flags);
> +		raw_spin_unlock_irqrestore(&bank->lock, flags);
>   		goto error;
>   	}
>   	omap_gpio_init_irq(bank, offset);
> --
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>


-- 
regards,
-grygorii
--
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