[PATCH kernel v3] powerpc/pci: Fix broken INTx configuration via OF

[PATCH kernel v3] powerpc/pci: Fix broken INTx configuration via OF

[Alexey Kardashevskiy]

Commit 59f47eff03a0 ("powerpc/pci: Use of_irq_parse_and_map_pci() helper")
replaced of_irq_parse_pci() + irq_create_of_mapping() with
of_irq_parse_and_map_pci() but this change lost virq returned by
irq_create_of_mapping() so virq remained zero causing INTx
misconfiguration.

This fixes pci_read_irq_line() not to loose a virq returned by
of_irq_parse_and_map_pci().

Fixes: 59f47eff03a0 "powerpc/pci: Use of_irq_parse_and_map_pci() helper"
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v3:
* change virq from unsigned to int as of_irq_parse_and_map_pci returns int
and even though it only returns non-negative values now, this may change
in the future

v2:
* changed the condition from <=0 to !=0 as by design
of_irq_parse_and_map_pci() can only return 0 for an error and virq>0.
---
 arch/powerpc/kernel/pci-common.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index ae2ede4..446c796 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -362,7 +362,7 @@ struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
  */
 static int pci_read_irq_line(struct pci_dev *pci_dev)
 {
-	unsigned int virq = 0;
+	int virq;
 
 	pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
 
@@ -370,7 +370,8 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
 	memset(&oirq, 0xff, sizeof(oirq));
 #endif
 	/* Try to get a mapping from the device-tree */
-	if (!of_irq_parse_and_map_pci(pci_dev, 0, 0)) {
+	virq = of_irq_parse_and_map_pci(pci_dev, 0, 0);
+	if (virq <= 0) {
 		u8 line, pin;
 
 		/* If that fails, lets fallback to what is in the config
-- 
2.11.0

Re: [PATCH kernel v3] powerpc/pci: Fix broken INTx configuration via OF

[Bjorn Helgaas]

On Fri, Feb 09, 2018 at 05:23:58PM +1100, Alexey Kardashevskiy wrote:
> Commit 59f47eff03a0 ("powerpc/pci: Use of_irq_parse_and_map_pci() helper")
> replaced of_irq_parse_pci() + irq_create_of_mapping() with
> of_irq_parse_and_map_pci() but this change lost virq returned by
> irq_create_of_mapping() so virq remained zero causing INTx
> misconfiguration.
> 
> This fixes pci_read_irq_line() not to loose a virq returned by
> of_irq_parse_and_map_pci().

s/not to loose a/to not lose the/

> Fixes: 59f47eff03a0 "powerpc/pci: Use of_irq_parse_and_map_pci() helper"
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

I'm fine with this version.

Since you started applying a previous version, Michael, I'll assume
you will handle this unless you tell me otherwise.  One way or another
it would be good to get this in before -rc1.

> ---
> Changes:
> v3:
> * change virq from unsigned to int as of_irq_parse_and_map_pci returns int
> and even though it only returns non-negative values now, this may change
> in the future
> 
> v2:
> * changed the condition from <=0 to !=0 as by design
> of_irq_parse_and_map_pci() can only return 0 for an error and virq>0.
> ---
>  arch/powerpc/kernel/pci-common.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> index ae2ede4..446c796 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -362,7 +362,7 @@ struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
>   */
>  static int pci_read_irq_line(struct pci_dev *pci_dev)
>  {
> -	unsigned int virq = 0;
> +	int virq;
>  
>  	pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
>  
> @@ -370,7 +370,8 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
>  	memset(&oirq, 0xff, sizeof(oirq));
>  #endif
>  	/* Try to get a mapping from the device-tree */
> -	if (!of_irq_parse_and_map_pci(pci_dev, 0, 0)) {
> +	virq = of_irq_parse_and_map_pci(pci_dev, 0, 0);
> +	if (virq <= 0) {
>  		u8 line, pin;
>  
>  		/* If that fails, lets fallback to what is in the config
> -- 
> 2.11.0
> 

Re: [PATCH kernel v3] powerpc/pci: Fix broken INTx configuration via OF

[Bjorn Helgaas]

On Fri, Feb 09, 2018 at 12:07:41PM -0600, Bjorn Helgaas wrote:
> On Fri, Feb 09, 2018 at 05:23:58PM +1100, Alexey Kardashevskiy wrote:
> > Commit 59f47eff03a0 ("powerpc/pci: Use of_irq_parse_and_map_pci() helper")
> > replaced of_irq_parse_pci() + irq_create_of_mapping() with
> > of_irq_parse_and_map_pci() but this change lost virq returned by
> > irq_create_of_mapping() so virq remained zero causing INTx
> > misconfiguration.
> > 
> > This fixes pci_read_irq_line() not to loose a virq returned by
> > of_irq_parse_and_map_pci().
> 
> s/not to loose a/to not lose the/
> 
> > Fixes: 59f47eff03a0 "powerpc/pci: Use of_irq_parse_and_map_pci() helper"
> > Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> 
> I'm fine with this version.
> 
> Since you started applying a previous version, Michael, I'll assume
> you will handle this unless you tell me otherwise.  One way or another
> it would be good to get this in before -rc1.

I went ahead and applied this and asked Linus to pull it.

> > ---
> > Changes:
> > v3:
> > * change virq from unsigned to int as of_irq_parse_and_map_pci returns int
> > and even though it only returns non-negative values now, this may change
> > in the future
> > 
> > v2:
> > * changed the condition from <=0 to !=0 as by design
> > of_irq_parse_and_map_pci() can only return 0 for an error and virq>0.
> > ---
> >  arch/powerpc/kernel/pci-common.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> > index ae2ede4..446c796 100644
> > --- a/arch/powerpc/kernel/pci-common.c
> > +++ b/arch/powerpc/kernel/pci-common.c
> > @@ -362,7 +362,7 @@ struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
> >   */
> >  static int pci_read_irq_line(struct pci_dev *pci_dev)
> >  {
> > -	unsigned int virq = 0;
> > +	int virq;
> >  
> >  	pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
> >  
> > @@ -370,7 +370,8 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
> >  	memset(&oirq, 0xff, sizeof(oirq));
> >  #endif
> >  	/* Try to get a mapping from the device-tree */
> > -	if (!of_irq_parse_and_map_pci(pci_dev, 0, 0)) {
> > +	virq = of_irq_parse_and_map_pci(pci_dev, 0, 0);
> > +	if (virq <= 0) {
> >  		u8 line, pin;
> >  
> >  		/* If that fails, lets fallback to what is in the config
> > -- 
> > 2.11.0
> > 

Re: [PATCH kernel v3] powerpc/pci: Fix broken INTx configuration via OF

[Michael Ellerman]

Bjorn Helgaas <helgaas@kernel.org> writes:

> On Fri, Feb 09, 2018 at 12:07:41PM -0600, Bjorn Helgaas wrote:
>> On Fri, Feb 09, 2018 at 05:23:58PM +1100, Alexey Kardashevskiy wrote:
>> > Commit 59f47eff03a0 ("powerpc/pci: Use of_irq_parse_and_map_pci() helper")
>> > replaced of_irq_parse_pci() + irq_create_of_mapping() with
>> > of_irq_parse_and_map_pci() but this change lost virq returned by
>> > irq_create_of_mapping() so virq remained zero causing INTx
>> > misconfiguration.
>> > 
>> > This fixes pci_read_irq_line() not to loose a virq returned by
>> > of_irq_parse_and_map_pci().
>> 
>> s/not to loose a/to not lose the/
>> 
>> > Fixes: 59f47eff03a0 "powerpc/pci: Use of_irq_parse_and_map_pci() helper"
>> > Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>> 
>> I'm fine with this version.
>> 
>> Since you started applying a previous version, Michael, I'll assume
>> you will handle this unless you tell me otherwise.  One way or another
>> it would be good to get this in before -rc1.
>
> I went ahead and applied this and asked Linus to pull it.

Thanks.

cheers