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[PATCH 16/17] pinctrl: single: remove misuse of IRQF_NO_SUSPEND flag

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  [PATCH 16/17] pinctrl: single: remove misuse of IRQF_NO_SUSPEND flag Sudeep Holla <sudeep.holla@arm.com> - 2015-09-21 17:50 +0200
    Re: [PATCH 16/17] pinctrl: single: remove misuse of IRQF_NO_SUSPEND  flag Thomas Gleixner <tglx@linutronix.de> - 2015-09-21 21:00 +0200
      Re: [PATCH 16/17] pinctrl: single: remove misuse of IRQF_NO_SUSPEND  flag Sudeep Holla <sudeep.holla@arm.com> - 2015-09-22 11:50 +0200

#1229490 — [PATCH 16/17] pinctrl: single: remove misuse of IRQF_NO_SUSPEND flag

The IRQF_NO_SUSPEND flag is used to identify the interrupts that should
be left enabled so as to allow them to work as expected during the
suspend-resume cycle, but doesn't guarantee that it will wake the system
from a suspended state, enable_irq_wake is recommended to be used for
the wakeup.

This patch removes the use of IRQF_NO_SUSPEND flags replacing it with
irq_set_irq_wake instead.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/pinctrl/pinctrl-single.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index ef04b962c3d5..a5d0f0e52de1 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1615,12 +1615,14 @@ static void pcs_irq_unmask(struct irq_data *d)
  */
 static int pcs_irq_set_wake(struct irq_data *d, unsigned int state)
 {
+	struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
+
 	if (state)
 		pcs_irq_unmask(d);
 	else
 		pcs_irq_mask(d);
 
-	return 0;
+	return irq_set_irq_wake(pcs_soc->irq, state);
 }
 
 /**
@@ -1755,8 +1757,7 @@ static int pcs_irq_init_chained_handler(struct pcs_device *pcs,
 		int res;
 
 		res = request_irq(pcs_soc->irq, pcs_irq_handler,
-				  IRQF_SHARED | IRQF_NO_SUSPEND |
-				  IRQF_NO_THREAD,
+				  IRQF_SHARED | IRQF_NO_THREAD,
 				  name, pcs_soc);
 		if (res) {
 			pcs_soc->irq = -1;
-- 
1.9.1

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#1229662 — Re: [PATCH 16/17] pinctrl: single: remove misuse of IRQF_NO_SUSPEND flag

On Mon, 21 Sep 2015, Sudeep Holla wrote:
> The IRQF_NO_SUSPEND flag is used to identify the interrupts that should
> be left enabled so as to allow them to work as expected during the
> suspend-resume cycle, but doesn't guarantee that it will wake the system
> from a suspended state, enable_irq_wake is recommended to be used for
> the wakeup.
> 
> This patch removes the use of IRQF_NO_SUSPEND flags replacing it with
> irq_set_irq_wake instead.
> 
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: linux-gpio@vger.kernel.org
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
>  drivers/pinctrl/pinctrl-single.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
> index ef04b962c3d5..a5d0f0e52de1 100644
> --- a/drivers/pinctrl/pinctrl-single.c
> +++ b/drivers/pinctrl/pinctrl-single.c
> @@ -1615,12 +1615,14 @@ static void pcs_irq_unmask(struct irq_data *d)
>   */
>  static int pcs_irq_set_wake(struct irq_data *d, unsigned int state)
>  {
> +	struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
> +
>  	if (state)
>  		pcs_irq_unmask(d);
>  	else
>  		pcs_irq_mask(d);
>  
> -	return 0;
> +	return irq_set_irq_wake(pcs_soc->irq, state);

That's going to create at least a lockdep splat due to nesting
irq_desc->lock.

Thanks,

	tglx
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#1230009 — Re: [PATCH 16/17] pinctrl: single: remove misuse of IRQF_NO_SUSPEND flag

On 21/09/15 19:53, Thomas Gleixner wrote:
> On Mon, 21 Sep 2015, Sudeep Holla wrote:
>> The IRQF_NO_SUSPEND flag is used to identify the interrupts that should
>> be left enabled so as to allow them to work as expected during the
>> suspend-resume cycle, but doesn't guarantee that it will wake the system
>> from a suspended state, enable_irq_wake is recommended to be used for
>> the wakeup.
>>
>> This patch removes the use of IRQF_NO_SUSPEND flags replacing it with
>> irq_set_irq_wake instead.
>>
>> Cc: Linus Walleij <linus.walleij@linaro.org>
>> Cc: linux-gpio@vger.kernel.org
>> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
>> ---
>>   drivers/pinctrl/pinctrl-single.c | 7 ++++---
>>   1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
>> index ef04b962c3d5..a5d0f0e52de1 100644
>> --- a/drivers/pinctrl/pinctrl-single.c
>> +++ b/drivers/pinctrl/pinctrl-single.c
>> @@ -1615,12 +1615,14 @@ static void pcs_irq_unmask(struct irq_data *d)
>>    */
>>   static int pcs_irq_set_wake(struct irq_data *d, unsigned int state)
>>   {
>> +	struct pcs_soc_data *pcs_soc = irq_data_get_irq_chip_data(d);
>> +
>>   	if (state)
>>   		pcs_irq_unmask(d);
>>   	else
>>   		pcs_irq_mask(d);
>>
>> -	return 0;
>> +	return irq_set_irq_wake(pcs_soc->irq, state);
>
> That's going to create at least a lockdep splat due to nesting
> irq_desc->lock.
>

Ah right, I noted that I must fix it when you pointed out similar issue
on the other thread[1]. I forgot later, sorry will look into that.

Regards,
Sudeep

[1] https://lkml.org/lkml/2015/9/8/617
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