linux-kernel - Re: [PATCH] pinctrl: renesas: rzg2l: use spin_{lock,unlock}

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Date: Tue, 21 May 2024 17:08:04 +0200
From: Diederik de Haas <didi.debian@...ow.org>
To: geert+renesas@...der.be, linus.walleij@...aro.org, efault@....de,
 Claudiu <claudiu.beznea@...on.dev>
Cc: linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-kernel@...r.kernel.org, claudiu.beznea@...on.dev,
 linux-rt-users@...r.kernel.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject:
 Re: [PATCH] pinctrl: renesas: rzg2l: use spin_{lock,unlock}_irq{save,restore}

On Monday, 20 May 2024 09:20:33 CEST Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> On PREEMPT_RT kernels the spinlock_t maps to an rtmutex. Using
> raw_spin_lock_irqsave()/raw_spin_unlock_irqrestore() on
> &pctrl->lock.rlock breaks the PREEMPT_RT builds. To fix this use
> spin_lock_irqsave()/spin_unlock_irqrestore() on &pctrl->lock.
> 
> Fixes: e1fd1f9f457b ("pinctrl: renesas: rzg2l: Configure the interrupt type
> on resume") Reported-by: Diederik de Haas <didi.debian@...ow.org>
> Closes: https://lore.kernel.org/all/131999629.KQPSlr0Zke@bagend
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> b/drivers/pinctrl/renesas/pinctrl-rzg2l.c index 20425afc6b33..78f947a8e26e
> 100644
> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> @@ -2069,11 +2069,11 @@ static void rzg2l_gpio_irq_restore(struct
> rzg2l_pinctrl *pctrl) * This has to be atomically executed to protect
> against a concurrent * interrupt.
>  		 */
> -		raw_spin_lock_irqsave(&pctrl->lock.rlock, flags);
> +		spin_lock_irqsave(&pctrl->lock, flags);
>  		ret = rzg2l_gpio_irq_set_type(data, 
irqd_get_trigger_type(data));
>  		if (!ret && !irqd_irq_disabled(data))
>  			rzg2l_gpio_irq_enable(data);
> -		raw_spin_unlock_irqrestore(&pctrl->lock.rlock, flags);
> +		spin_unlock_irqrestore(&pctrl->lock, flags);
> 
>  		if (ret)
>  			dev_crit(pctrl->dev, "Failed to set IRQ type 
for virq=%u\n", virq);

Now the build succeeds on both amd64 and arm64.
Thanks!
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