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Groups > linux.kernel > #1367026 > unrolled thread

[PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

Started byHenry Chen <henryc.chen@mediatek.com>
First post2016-03-30 11:10 +0200
Last post2016-03-31 16:10 +0200
Articles 7 — 3 participants

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  [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices() Henry Chen <henryc.chen@mediatek.com> - 2016-03-30 11:10 +0200
    Re: [PATCH] mfd: mt6397: irq domain should initialize before  mfd_add_devices() John Crispin <blogic@openwrt.org> - 2016-03-30 11:20 +0200
      Re: [PATCH] mfd: mt6397: irq domain should initialize before  mfd_add_devices() Henry Chen <henryc.chen@mediatek.com> - 2016-03-31 03:50 +0200
        Re: [PATCH] mfd: mt6397: irq domain should initialize before  mfd_add_devices() Yingjoe Chen <yingjoe.chen@mediatek.com> - 2016-03-31 04:40 +0200
          Re: [PATCH] mfd: mt6397: irq domain should initialize before  mfd_add_devices() John Crispin <blogic@openwrt.org> - 2016-03-31 11:10 +0200
            Re: [PATCH] mfd: mt6397: irq domain should initialize before  mfd_add_devices() Yingjoe Chen <yingjoe.chen@mediatek.com> - 2016-03-31 15:50 +0200
              Re: [PATCH] mfd: mt6397: irq domain should initialize before  mfd_add_devices() John Crispin <blogic@openwrt.org> - 2016-03-31 16:10 +0200

#1367026 — [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

FromHenry Chen <henryc.chen@mediatek.com>
Date2016-03-30 11:10 +0200
Subject[PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()
Message-ID<rikit-37e-7@gated-at.bofh.it>
Some sub driver like RTC module need irq domain from parent to create
irq mapping when driver initialize. so move mt6397_irq_init() before
mfd_add_devices().

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
---
This patch fixed the below warning based on "Linux kernel v4.6-rc1"
WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
irq_create_mapping+0xc4/0xd0
---
 drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
index 8e8d932..a879223 100644
--- a/drivers/mfd/mt6397-core.c
+++ b/drivers/mfd/mt6397-core.c
@@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
 		goto fail_irq;
 	}
 
+	pmic->irq = platform_get_irq(pdev, 0);
+
 	switch (id & 0xff) {
 	case MT6323_CID_CODE:
-		pmic->int_con[0] = MT6323_INT_CON0;
-		pmic->int_con[1] = MT6323_INT_CON1;
-		pmic->int_status[0] = MT6323_INT_STATUS0;
-		pmic->int_status[1] = MT6323_INT_STATUS1;
+		if (pmic->irq > 0) {
+			pmic->int_con[0] = MT6323_INT_CON0;
+			pmic->int_con[1] = MT6323_INT_CON1;
+			pmic->int_status[0] = MT6323_INT_STATUS0;
+			pmic->int_status[1] = MT6323_INT_STATUS1;
+			ret = mt6397_irq_init(pmic);
+			if (ret)
+				return ret;
+		}
+
 		ret = mfd_add_devices(&pdev->dev, -1, mt6323_devs,
 				ARRAY_SIZE(mt6323_devs), NULL, 0, NULL);
 		break;
 
 	case MT6397_CID_CODE:
 	case MT6391_CID_CODE:
-		pmic->int_con[0] = MT6397_INT_CON0;
-		pmic->int_con[1] = MT6397_INT_CON1;
-		pmic->int_status[0] = MT6397_INT_STATUS0;
-		pmic->int_status[1] = MT6397_INT_STATUS1;
+		if (pmic->irq > 0) {
+			pmic->int_con[0] = MT6397_INT_CON0;
+			pmic->int_con[1] = MT6397_INT_CON1;
+			pmic->int_status[0] = MT6397_INT_STATUS0;
+			pmic->int_status[1] = MT6397_INT_STATUS1;
+			ret = mt6397_irq_init(pmic);
+			if (ret)
+				return ret;
+		}
+
 		ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
 				ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
 		break;
@@ -296,13 +310,6 @@ static int mt6397_probe(struct platform_device *pdev)
 		break;
 	}
 
-	pmic->irq = platform_get_irq(pdev, 0);
-	if (pmic->irq > 0) {
-		ret = mt6397_irq_init(pmic);
-		if (ret)
-			return ret;
-	}
-
 fail_irq:
 	if (ret) {
 		irq_domain_remove(pmic->irq_domain);
-- 
1.8.1.1.dirty

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#1367032 — Re: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

FromJohn Crispin <blogic@openwrt.org>
Date2016-03-30 11:20 +0200
SubjectRe: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()
Message-ID<riksb-3aA-21@gated-at.bofh.it>
In reply to#1367026
Hi,

small nitpick inline

On 30/03/2016 09:25, Henry Chen wrote:
> Some sub driver like RTC module need irq domain from parent to create
> irq mapping when driver initialize. so move mt6397_irq_init() before
> mfd_add_devices().
> 
> Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
> ---
> This patch fixed the below warning based on "Linux kernel v4.6-rc1"
> WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
> irq_create_mapping+0xc4/0xd0
> ---
>  drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
>  1 file changed, 22 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> index 8e8d932..a879223 100644
> --- a/drivers/mfd/mt6397-core.c
> +++ b/drivers/mfd/mt6397-core.c
> @@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
>  		goto fail_irq;
>  	}
>  
> +	pmic->irq = platform_get_irq(pdev, 0);
> +
>  	switch (id & 0xff) {
>  	case MT6323_CID_CODE:
> -		pmic->int_con[0] = MT6323_INT_CON0;
> -		pmic->int_con[1] = MT6323_INT_CON1;
> -		pmic->int_status[0] = MT6323_INT_STATUS0;
> -		pmic->int_status[1] = MT6323_INT_STATUS1;
> +		if (pmic->irq > 0) {

should this not be

		if (pmic->irq >= 0) {

i think the code before your patch was wrong as linux irqs start with 0.

	John


> +			pmic->int_con[0] = MT6323_INT_CON0;
> +			pmic->int_con[1] = MT6323_INT_CON1;
> +			pmic->int_status[0] = MT6323_INT_STATUS0;
> +			pmic->int_status[1] = MT6323_INT_STATUS1;
> +			ret = mt6397_irq_init(pmic);
> +			if (ret)
> +				return ret;
> +		}
> +
>  		ret = mfd_add_devices(&pdev->dev, -1, mt6323_devs,
>  				ARRAY_SIZE(mt6323_devs), NULL, 0, NULL);
>  		break;
>  
>  	case MT6397_CID_CODE:
>  	case MT6391_CID_CODE:
> -		pmic->int_con[0] = MT6397_INT_CON0;
> -		pmic->int_con[1] = MT6397_INT_CON1;
> -		pmic->int_status[0] = MT6397_INT_STATUS0;
> -		pmic->int_status[1] = MT6397_INT_STATUS1;
> +		if (pmic->irq > 0) {
> +			pmic->int_con[0] = MT6397_INT_CON0;
> +			pmic->int_con[1] = MT6397_INT_CON1;
> +			pmic->int_status[0] = MT6397_INT_STATUS0;
> +			pmic->int_status[1] = MT6397_INT_STATUS1;
> +			ret = mt6397_irq_init(pmic);
> +			if (ret)
> +				return ret;
> +		}
> +
>  		ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
>  				ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
>  		break;
> @@ -296,13 +310,6 @@ static int mt6397_probe(struct platform_device *pdev)
>  		break;
>  	}
>  
> -	pmic->irq = platform_get_irq(pdev, 0);
> -	if (pmic->irq > 0) {
> -		ret = mt6397_irq_init(pmic);
> -		if (ret)
> -			return ret;
> -	}
> -
>  fail_irq:
>  	if (ret) {
>  		irq_domain_remove(pmic->irq_domain);
>

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#1367741 — Re: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

FromHenry Chen <henryc.chen@mediatek.com>
Date2016-03-31 03:50 +0200
SubjectRe: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()
Message-ID<rizUe-5Lv-5@gated-at.bofh.it>
In reply to#1367032
On Wed, 2016-03-30 at 11:18 +0200, John Crispin wrote:
> Hi,
> 
> small nitpick inline
> 
> On 30/03/2016 09:25, Henry Chen wrote:
> > Some sub driver like RTC module need irq domain from parent to create
> > irq mapping when driver initialize. so move mt6397_irq_init() before
> > mfd_add_devices().
> > 
> > Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
> > ---
> > This patch fixed the below warning based on "Linux kernel v4.6-rc1"
> > WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
> > irq_create_mapping+0xc4/0xd0
> > ---
> >  drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
> >  1 file changed, 22 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> > index 8e8d932..a879223 100644
> > --- a/drivers/mfd/mt6397-core.c
> > +++ b/drivers/mfd/mt6397-core.c
> > @@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
> >  		goto fail_irq;
> >  	}
> >  
> > +	pmic->irq = platform_get_irq(pdev, 0);
> > +
> >  	switch (id & 0xff) {
> >  	case MT6323_CID_CODE:
> > -		pmic->int_con[0] = MT6323_INT_CON0;
> > -		pmic->int_con[1] = MT6323_INT_CON1;
> > -		pmic->int_status[0] = MT6323_INT_STATUS0;
> > -		pmic->int_status[1] = MT6323_INT_STATUS1;
> > +		if (pmic->irq > 0) {
> 
> should this not be
> 
> 		if (pmic->irq >= 0) {
> 
> i think the code before your patch was wrong as linux irqs start with 0.
> 
> 	John
Hi John,

Thanks, I will modify this.

Henry

> 
> 
> > +			pmic->int_con[0] = MT6323_INT_CON0;
> > +			pmic->int_con[1] = MT6323_INT_CON1;
> > +			pmic->int_status[0] = MT6323_INT_STATUS0;
> > +			pmic->int_status[1] = MT6323_INT_STATUS1;
> > +			ret = mt6397_irq_init(pmic);
> > +			if (ret)
> > +				return ret;
> > +		}
> > +
> >  		ret = mfd_add_devices(&pdev->dev, -1, mt6323_devs,
> >  				ARRAY_SIZE(mt6323_devs), NULL, 0, NULL);
> >  		break;
> >  
> >  	case MT6397_CID_CODE:
> >  	case MT6391_CID_CODE:
> > -		pmic->int_con[0] = MT6397_INT_CON0;
> > -		pmic->int_con[1] = MT6397_INT_CON1;
> > -		pmic->int_status[0] = MT6397_INT_STATUS0;
> > -		pmic->int_status[1] = MT6397_INT_STATUS1;
> > +		if (pmic->irq > 0) {
> > +			pmic->int_con[0] = MT6397_INT_CON0;
> > +			pmic->int_con[1] = MT6397_INT_CON1;
> > +			pmic->int_status[0] = MT6397_INT_STATUS0;
> > +			pmic->int_status[1] = MT6397_INT_STATUS1;
> > +			ret = mt6397_irq_init(pmic);
> > +			if (ret)
> > +				return ret;
> > +		}
> > +
> >  		ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
> >  				ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
> >  		break;
> > @@ -296,13 +310,6 @@ static int mt6397_probe(struct platform_device *pdev)
> >  		break;
> >  	}
> >  
> > -	pmic->irq = platform_get_irq(pdev, 0);
> > -	if (pmic->irq > 0) {
> > -		ret = mt6397_irq_init(pmic);
> > -		if (ret)
> > -			return ret;
> > -	}
> > -
> >  fail_irq:
> >  	if (ret) {
> >  		irq_domain_remove(pmic->irq_domain);
> >

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#1367763 — Re: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

FromYingjoe Chen <yingjoe.chen@mediatek.com>
Date2016-03-31 04:40 +0200
SubjectRe: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()
Message-ID<riAGC-6uv-11@gated-at.bofh.it>
In reply to#1367741
On Thu, 2016-03-31 at 09:40 +0800, Henry Chen wrote:
> On Wed, 2016-03-30 at 11:18 +0200, John Crispin wrote:
> > Hi,
> > 
> > small nitpick inline
> > 
> > On 30/03/2016 09:25, Henry Chen wrote:
> > > Some sub driver like RTC module need irq domain from parent to create
> > > irq mapping when driver initialize. so move mt6397_irq_init() before
> > > mfd_add_devices().
> > > 
> > > Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
> > > ---
> > > This patch fixed the below warning based on "Linux kernel v4.6-rc1"
> > > WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
> > > irq_create_mapping+0xc4/0xd0
> > > ---
> > >  drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
> > >  1 file changed, 22 insertions(+), 15 deletions(-)
> > > 
> > > diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> > > index 8e8d932..a879223 100644
> > > --- a/drivers/mfd/mt6397-core.c
> > > +++ b/drivers/mfd/mt6397-core.c
> > > @@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
> > >  		goto fail_irq;
> > >  	}
> > >  
> > > +	pmic->irq = platform_get_irq(pdev, 0);
> > > +
> > >  	switch (id & 0xff) {
> > >  	case MT6323_CID_CODE:
> > > -		pmic->int_con[0] = MT6323_INT_CON0;
> > > -		pmic->int_con[1] = MT6323_INT_CON1;
> > > -		pmic->int_status[0] = MT6323_INT_STATUS0;
> > > -		pmic->int_status[1] = MT6323_INT_STATUS1;
> > > +		if (pmic->irq > 0) {
> > 
> > should this not be
> > 
> > 		if (pmic->irq >= 0) {
> > 
> > i think the code before your patch was wrong as linux irqs start with 0.
> > 
> > 	John
> Hi John,
> 
> Thanks, I will modify this.

Linux irq start from 1, 0 is invalid. I can't find the document saying
this now, but you could see this from irq_create_mapping() in
kernel/irq/irqdomain.c

I think the code should have check return from platform_get_irq and
handle -EPROBE_DEFER, but maybe it should be another patch?

BTW, in this function, it is possible that pmic->irq_domain will be NULL
in fail_irq error handling. We should check before calling
irq_domain_remove.

Joe.C

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#1368031 — Re: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

FromJohn Crispin <blogic@openwrt.org>
Date2016-03-31 11:10 +0200
SubjectRe: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()
Message-ID<riGM2-2Es-21@gated-at.bofh.it>
In reply to#1367763

On 31/03/2016 04:32, Yingjoe Chen wrote:
> On Thu, 2016-03-31 at 09:40 +0800, Henry Chen wrote:
>> On Wed, 2016-03-30 at 11:18 +0200, John Crispin wrote:
>>> Hi,
>>>
>>> small nitpick inline
>>>
>>> On 30/03/2016 09:25, Henry Chen wrote:
>>>> Some sub driver like RTC module need irq domain from parent to create
>>>> irq mapping when driver initialize. so move mt6397_irq_init() before
>>>> mfd_add_devices().
>>>>
>>>> Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
>>>> ---
>>>> This patch fixed the below warning based on "Linux kernel v4.6-rc1"
>>>> WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
>>>> irq_create_mapping+0xc4/0xd0
>>>> ---
>>>>  drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
>>>>  1 file changed, 22 insertions(+), 15 deletions(-)
>>>>
>>>> diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
>>>> index 8e8d932..a879223 100644
>>>> --- a/drivers/mfd/mt6397-core.c
>>>> +++ b/drivers/mfd/mt6397-core.c
>>>> @@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
>>>>  		goto fail_irq;
>>>>  	}
>>>>  
>>>> +	pmic->irq = platform_get_irq(pdev, 0);
>>>> +
>>>>  	switch (id & 0xff) {
>>>>  	case MT6323_CID_CODE:
>>>> -		pmic->int_con[0] = MT6323_INT_CON0;
>>>> -		pmic->int_con[1] = MT6323_INT_CON1;
>>>> -		pmic->int_status[0] = MT6323_INT_STATUS0;
>>>> -		pmic->int_status[1] = MT6323_INT_STATUS1;
>>>> +		if (pmic->irq > 0) {
>>>
>>> should this not be
>>>
>>> 		if (pmic->irq >= 0) {
>>>
>>> i think the code before your patch was wrong as linux irqs start with 0.
>>>
>>> 	John
>> Hi John,
>>
>> Thanks, I will modify this.
> 
> Linux irq start from 1, 0 is invalid. I can't find the document saying
> this now, but you could see this from irq_create_mapping() in
> kernel/irq/irqdomain.c
> 
> I think the code should have check return from platform_get_irq and
> handle -EPROBE_DEFER, but maybe it should be another patch?
> 
> BTW, in this function, it is possible that pmic->irq_domain will be NULL
> in fail_irq error handling. We should check before calling
> irq_domain_remove.
> 
> Joe.C
> 

Hi,

looking at
http://lxr.free-electrons.com/source/drivers/base/platform.c#L87 there
is a check in line #100 ret >= 0

checking the return value of pmic->irq = platform_get_irq(pdev, 0);
should follow the same pattern i think .. unless i have a thinko and am
reading the code wrong.

	John

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#1368310 — Re: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

FromYingjoe Chen <yingjoe.chen@mediatek.com>
Date2016-03-31 15:50 +0200
SubjectRe: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()
Message-ID<riL8Z-5Qv-15@gated-at.bofh.it>
In reply to#1368031
On Thu, 2016-03-31 at 11:08 +0200, John Crispin wrote:
> 
> On 31/03/2016 04:32, Yingjoe Chen wrote:
> > On Thu, 2016-03-31 at 09:40 +0800, Henry Chen wrote:
> >> On Wed, 2016-03-30 at 11:18 +0200, John Crispin wrote:
> >>> Hi,
> >>>
> >>> small nitpick inline
> >>>
> >>> On 30/03/2016 09:25, Henry Chen wrote:
> >>>> Some sub driver like RTC module need irq domain from parent to create
> >>>> irq mapping when driver initialize. so move mt6397_irq_init() before
> >>>> mfd_add_devices().
> >>>>
> >>>> Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
> >>>> ---
> >>>> This patch fixed the below warning based on "Linux kernel v4.6-rc1"
> >>>> WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
> >>>> irq_create_mapping+0xc4/0xd0
> >>>> ---
> >>>>  drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
> >>>>  1 file changed, 22 insertions(+), 15 deletions(-)
> >>>>
> >>>> diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> >>>> index 8e8d932..a879223 100644
> >>>> --- a/drivers/mfd/mt6397-core.c
> >>>> +++ b/drivers/mfd/mt6397-core.c
> >>>> @@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
> >>>>  		goto fail_irq;
> >>>>  	}
> >>>>  
> >>>> +	pmic->irq = platform_get_irq(pdev, 0);
> >>>> +
> >>>>  	switch (id & 0xff) {
> >>>>  	case MT6323_CID_CODE:
> >>>> -		pmic->int_con[0] = MT6323_INT_CON0;
> >>>> -		pmic->int_con[1] = MT6323_INT_CON1;
> >>>> -		pmic->int_status[0] = MT6323_INT_STATUS0;
> >>>> -		pmic->int_status[1] = MT6323_INT_STATUS1;
> >>>> +		if (pmic->irq > 0) {
> >>>
> >>> should this not be
> >>>
> >>> 		if (pmic->irq >= 0) {
> >>>
> >>> i think the code before your patch was wrong as linux irqs start with 0.
> >>>
> >>> 	John
> >> Hi John,
> >>
> >> Thanks, I will modify this.
> > 
> > Linux irq start from 1, 0 is invalid. I can't find the document saying
> > this now, but you could see this from irq_create_mapping() in
> > kernel/irq/irqdomain.c
> > 
> > I think the code should have check return from platform_get_irq and
> > handle -EPROBE_DEFER, but maybe it should be another patch?
> > 
> > BTW, in this function, it is possible that pmic->irq_domain will be NULL
> > in fail_irq error handling. We should check before calling
> > irq_domain_remove.
> > 
> > Joe.C
> > 
> 
> Hi,
> 
> looking at
> http://lxr.free-electrons.com/source/drivers/base/platform.c#L87 there
> is a check in line #100 ret >= 0
> 
> checking the return value of pmic->irq = platform_get_irq(pdev, 0);
> should follow the same pattern i think .. unless i have a thinko and am
> reading the code wrong.


I'm not sure why platform_get_irq() check for 0, but I think the code
logic is differnet.

When platform_get_irq() return 0 to our code, it means we don't have
valid irq to use. In this case it doesn't make any sense to continue
init irq.


Joe.C

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#1368329 — Re: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()

FromJohn Crispin <blogic@openwrt.org>
Date2016-03-31 16:10 +0200
SubjectRe: [PATCH] mfd: mt6397: irq domain should initialize before mfd_add_devices()
Message-ID<riLsm-6eH-17@gated-at.bofh.it>
In reply to#1368310

On 31/03/2016 15:41, Yingjoe Chen wrote:
> On Thu, 2016-03-31 at 11:08 +0200, John Crispin wrote:
>>
>> On 31/03/2016 04:32, Yingjoe Chen wrote:
>>> On Thu, 2016-03-31 at 09:40 +0800, Henry Chen wrote:
>>>> On Wed, 2016-03-30 at 11:18 +0200, John Crispin wrote:
>>>>> Hi,
>>>>>
>>>>> small nitpick inline
>>>>>
>>>>> On 30/03/2016 09:25, Henry Chen wrote:
>>>>>> Some sub driver like RTC module need irq domain from parent to create
>>>>>> irq mapping when driver initialize. so move mt6397_irq_init() before
>>>>>> mfd_add_devices().
>>>>>>
>>>>>> Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
>>>>>> ---
>>>>>> This patch fixed the below warning based on "Linux kernel v4.6-rc1"
>>>>>> WARNING: CPU: 1 PID: 132 at kernel/mediatek/kernel/irq/irqdomain.c:471
>>>>>> irq_create_mapping+0xc4/0xd0
>>>>>> ---
>>>>>>  drivers/mfd/mt6397-core.c | 37 ++++++++++++++++++++++---------------
>>>>>>  1 file changed, 22 insertions(+), 15 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
>>>>>> index 8e8d932..a879223 100644
>>>>>> --- a/drivers/mfd/mt6397-core.c
>>>>>> +++ b/drivers/mfd/mt6397-core.c
>>>>>> @@ -270,22 +270,36 @@ static int mt6397_probe(struct platform_device *pdev)
>>>>>>  		goto fail_irq;
>>>>>>  	}
>>>>>>  
>>>>>> +	pmic->irq = platform_get_irq(pdev, 0);
>>>>>> +
>>>>>>  	switch (id & 0xff) {
>>>>>>  	case MT6323_CID_CODE:
>>>>>> -		pmic->int_con[0] = MT6323_INT_CON0;
>>>>>> -		pmic->int_con[1] = MT6323_INT_CON1;
>>>>>> -		pmic->int_status[0] = MT6323_INT_STATUS0;
>>>>>> -		pmic->int_status[1] = MT6323_INT_STATUS1;
>>>>>> +		if (pmic->irq > 0) {
>>>>>
>>>>> should this not be
>>>>>
>>>>> 		if (pmic->irq >= 0) {
>>>>>
>>>>> i think the code before your patch was wrong as linux irqs start with 0.
>>>>>
>>>>> 	John
>>>> Hi John,
>>>>
>>>> Thanks, I will modify this.
>>>
>>> Linux irq start from 1, 0 is invalid. I can't find the document saying
>>> this now, but you could see this from irq_create_mapping() in
>>> kernel/irq/irqdomain.c
>>>
>>> I think the code should have check return from platform_get_irq and
>>> handle -EPROBE_DEFER, but maybe it should be another patch?
>>>
>>> BTW, in this function, it is possible that pmic->irq_domain will be NULL
>>> in fail_irq error handling. We should check before calling
>>> irq_domain_remove.
>>>
>>> Joe.C
>>>
>>
>> Hi,
>>
>> looking at
>> http://lxr.free-electrons.com/source/drivers/base/platform.c#L87 there
>> is a check in line #100 ret >= 0
>>
>> checking the return value of pmic->irq = platform_get_irq(pdev, 0);
>> should follow the same pattern i think .. unless i have a thinko and am
>> reading the code wrong.
> 
> 
> I'm not sure why platform_get_irq() check for 0, but I think the code
> logic is differnet.
> 
> When platform_get_irq() return 0 to our code, it means we don't have
> valid irq to use. In this case it doesn't make any sense to continue
> init irq.
> 
> 
> Joe.C
> 


--> http://lwn.net/Articles/470820/

indeed ARM has changed this is seems. was not aware of this change,
sorry for the noise

	John

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