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

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Message-ID: <20150807033642.GI4215@atomide.com>
Date:	Thu, 6 Aug 2015 20:36:42 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Grygorii Strashko <grygorii.strashko@...com>,
	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

* 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.

Regards,

Tony

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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