diff mbox

[v5,3/7] pci: Create pci_host_bridge before its associated bus in pci_create_root_bus.

Message ID 1393948204-11555-4-git-send-email-Liviu.Dudau@arm.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Liviu Dudau March 4, 2014, 3:50 p.m. UTC 
Before commit 7b5436635800 the pci_host_bridge was created before the root bus.
As that commit has added a needless dependency on the bus for pci_alloc_host_bridge()
the creation order has been changed for no good reason. Revert the order of
creation as we are going to depend on the pci_host_bridge structure to retrieve the
domain number of the root bus.

Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>

Comments

Yijing Wang March 5, 2014, 3:48 a.m. UTC | #1 
On 2014/3/4 23:50, Liviu Dudau wrote:
> Before commit 7b5436635800 the pci_host_bridge was created before the root bus.
> As that commit has added a needless dependency on the bus for pci_alloc_host_bridge()
> the creation order has been changed for no good reason. Revert the order of
> creation as we are going to depend on the pci_host_bridge structure to retrieve the
> domain number of the root bus.
> 
> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 6e34498..78ccba0 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -505,7 +505,7 @@ static void pci_release_host_bridge_dev(struct device *dev)
>  	kfree(bridge);
>  }
>  
> -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
> +static struct pci_host_bridge *pci_alloc_host_bridge(void)
>  {
>  	struct pci_host_bridge *bridge;
>  
> @@ -514,7 +514,6 @@ static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
>  		return NULL;
>  
>  	INIT_LIST_HEAD(&bridge->windows);
> -	bridge->bus = b;
>  	return bridge;
>  }
>  
> @@ -1727,9 +1726,21 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>  	char bus_addr[64];
>  	char *fmt;
>  
> +	bridge = pci_alloc_host_bridge();
> +	if (!bridge)
> +		return NULL;
> +
> +	bridge->dev.parent = parent;
> +	bridge->dev.release = pci_release_host_bridge_dev;
> +	error = pcibios_root_bridge_prepare(bridge);
> +	if (error) {
> +		kfree(bridge);
> +		return NULL;

What about use goto err_out?

> +	}
> +
>  	b = pci_alloc_bus();
>  	if (!b)
> -		return NULL;
> +		goto err_out;
>  
>  	b->sysdata = sysdata;
>  	b->ops = ops;
> @@ -1738,26 +1749,15 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>  	if (b2) {
>  		/* If we already got to this bus through a different bridge, ignore it */
>  		dev_dbg(&b2->dev, "bus already known\n");
> -		goto err_out;
> +		goto err_bus_out;
>  	}
>  
> -	bridge = pci_alloc_host_bridge(b);
> -	if (!bridge)
> -		goto err_out;
> -
> -	bridge->dev.parent = parent;
> -	bridge->dev.release = pci_release_host_bridge_dev;
> +	bridge->bus = b;
>  	dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
> -	error = pcibios_root_bridge_prepare(bridge);
> -	if (error) {
> -		kfree(bridge);
> -		goto err_out;
> -	}
> -
>  	error = device_register(&bridge->dev);
>  	if (error) {
>  		put_device(&bridge->dev);
> -		goto err_out;
> +		goto err_bus_out;
>  	}
>  	b->bridge = get_device(&bridge->dev);
>  	device_enable_async_suspend(b->bridge);
> @@ -1814,8 +1814,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>  class_dev_reg_err:
>  	put_device(&bridge->dev);
>  	device_unregister(&bridge->dev);
> -err_out:
> +err_bus_out:
>  	kfree(b);
> +err_out:
> +	kfree(bridge);
>  	return NULL;
>  }
>  
>
Jingoo Han March 5, 2014, 4:41 a.m. UTC | #2 
On Wednesday, March 05, 2014 12:48 PM, Yijing Wang wrote:
> On 2014/3/4 23:50, Liviu Dudau wrote:
> > Before commit 7b5436635800 the pci_host_bridge was created before the root bus.
> > As that commit has added a needless dependency on the bus for pci_alloc_host_bridge()
> > the creation order has been changed for no good reason. Revert the order of
> > creation as we are going to depend on the pci_host_bridge structure to retrieve the
> > domain number of the root bus.
> >
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
> >
> > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> > index 6e34498..78ccba0 100644
> > --- a/drivers/pci/probe.c
> > +++ b/drivers/pci/probe.c
> > @@ -505,7 +505,7 @@ static void pci_release_host_bridge_dev(struct device *dev)
> >  	kfree(bridge);
> >  }
> >
> > -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
> > +static struct pci_host_bridge *pci_alloc_host_bridge(void)
> >  {
> >  	struct pci_host_bridge *bridge;
> >
> > @@ -514,7 +514,6 @@ static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
> >  		return NULL;
> >
> >  	INIT_LIST_HEAD(&bridge->windows);
> > -	bridge->bus = b;
> >  	return bridge;
> >  }
> >
> > @@ -1727,9 +1726,21 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> >  	char bus_addr[64];
> >  	char *fmt;
> >
> > +	bridge = pci_alloc_host_bridge();
> > +	if (!bridge)
> > +		return NULL;
> > +
> > +	bridge->dev.parent = parent;
> > +	bridge->dev.release = pci_release_host_bridge_dev;
> > +	error = pcibios_root_bridge_prepare(bridge);
> > +	if (error) {
> > +		kfree(bridge);
> > +		return NULL;
> 
> What about use goto err_out?

+1

I agree with your opinion.
It makes the code simpler.

Best regards,
Jingoo Han

> 
> > +	}
> > +
> >  	b = pci_alloc_bus();
> >  	if (!b)
> > -		return NULL;
> > +		goto err_out;
> >
> >  	b->sysdata = sysdata;
> >  	b->ops = ops;
> > @@ -1738,26 +1749,15 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> >  	if (b2) {
> >  		/* If we already got to this bus through a different bridge, ignore it */
> >  		dev_dbg(&b2->dev, "bus already known\n");
> > -		goto err_out;
> > +		goto err_bus_out;
> >  	}
> >
> > -	bridge = pci_alloc_host_bridge(b);
> > -	if (!bridge)
> > -		goto err_out;
> > -
> > -	bridge->dev.parent = parent;
> > -	bridge->dev.release = pci_release_host_bridge_dev;
> > +	bridge->bus = b;
> >  	dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
> > -	error = pcibios_root_bridge_prepare(bridge);
> > -	if (error) {
> > -		kfree(bridge);
> > -		goto err_out;
> > -	}
> > -
> >  	error = device_register(&bridge->dev);
> >  	if (error) {
> >  		put_device(&bridge->dev);
> > -		goto err_out;
> > +		goto err_bus_out;
> >  	}
> >  	b->bridge = get_device(&bridge->dev);
> >  	device_enable_async_suspend(b->bridge);
> > @@ -1814,8 +1814,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> >  class_dev_reg_err:
> >  	put_device(&bridge->dev);
> >  	device_unregister(&bridge->dev);
> > -err_out:
> > +err_bus_out:
> >  	kfree(b);
> > +err_out:
> > +	kfree(bridge);
> >  	return NULL;
> >  }
> >
> >

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Liviu Dudau March 5, 2014, 8:19 a.m. UTC | #3 
On Wed, Mar 05, 2014 at 04:41:35AM +0000, Jingoo Han wrote:
> On Wednesday, March 05, 2014 12:48 PM, Yijing Wang wrote:
> > On 2014/3/4 23:50, Liviu Dudau wrote:
> > > Before commit 7b5436635800 the pci_host_bridge was created before the root bus.
> > > As that commit has added a needless dependency on the bus for pci_alloc_host_bridge()
> > > the creation order has been changed for no good reason. Revert the order of
> > > creation as we are going to depend on the pci_host_bridge structure to retrieve the
> > > domain number of the root bus.
> > >
> > > Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
> > >
> > > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> > > index 6e34498..78ccba0 100644
> > > --- a/drivers/pci/probe.c
> > > +++ b/drivers/pci/probe.c
> > > @@ -505,7 +505,7 @@ static void pci_release_host_bridge_dev(struct device *dev)
> > >  	kfree(bridge);
> > >  }
> > >
> > > -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
> > > +static struct pci_host_bridge *pci_alloc_host_bridge(void)
> > >  {
> > >  	struct pci_host_bridge *bridge;
> > >
> > > @@ -514,7 +514,6 @@ static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
> > >  		return NULL;
> > >
> > >  	INIT_LIST_HEAD(&bridge->windows);
> > > -	bridge->bus = b;
> > >  	return bridge;
> > >  }
> > >
> > > @@ -1727,9 +1726,21 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> > >  	char bus_addr[64];
> > >  	char *fmt;
> > >
> > > +	bridge = pci_alloc_host_bridge();
> > > +	if (!bridge)
> > > +		return NULL;
> > > +
> > > +	bridge->dev.parent = parent;
> > > +	bridge->dev.release = pci_release_host_bridge_dev;
> > > +	error = pcibios_root_bridge_prepare(bridge);
> > > +	if (error) {
> > > +		kfree(bridge);
> > > +		return NULL;
> > 
> > What about use goto err_out?
> 
> +1
> 
> I agree with your opinion.
> It makes the code simpler.

Hi Yijing and Jingoo,

Thanks for reviewing these patches, I will make the change for the next version.

Best regards,
Liviu

> 
> Best regards,
> Jingoo Han
> 
> > 
> > > +	}
> > > +
> > >  	b = pci_alloc_bus();
> > >  	if (!b)
> > > -		return NULL;
> > > +		goto err_out;
> > >
> > >  	b->sysdata = sysdata;
> > >  	b->ops = ops;
> > > @@ -1738,26 +1749,15 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> > >  	if (b2) {
> > >  		/* If we already got to this bus through a different bridge, ignore it */
> > >  		dev_dbg(&b2->dev, "bus already known\n");
> > > -		goto err_out;
> > > +		goto err_bus_out;
> > >  	}
> > >
> > > -	bridge = pci_alloc_host_bridge(b);
> > > -	if (!bridge)
> > > -		goto err_out;
> > > -
> > > -	bridge->dev.parent = parent;
> > > -	bridge->dev.release = pci_release_host_bridge_dev;
> > > +	bridge->bus = b;
> > >  	dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
> > > -	error = pcibios_root_bridge_prepare(bridge);
> > > -	if (error) {
> > > -		kfree(bridge);
> > > -		goto err_out;
> > > -	}
> > > -
> > >  	error = device_register(&bridge->dev);
> > >  	if (error) {
> > >  		put_device(&bridge->dev);
> > > -		goto err_out;
> > > +		goto err_bus_out;
> > >  	}
> > >  	b->bridge = get_device(&bridge->dev);
> > >  	device_enable_async_suspend(b->bridge);
> > > @@ -1814,8 +1814,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> > >  class_dev_reg_err:
> > >  	put_device(&bridge->dev);
> > >  	device_unregister(&bridge->dev);
> > > -err_out:
> > > +err_bus_out:
> > >  	kfree(b);
> > > +err_out:
> > > +	kfree(bridge);
> > >  	return NULL;
> > >  }
> > >
> > >
> 
>
diff mbox

Patch

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6e34498..78ccba0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -505,7 +505,7 @@  static void pci_release_host_bridge_dev(struct device *dev)
 	kfree(bridge);
 }
 
-static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
+static struct pci_host_bridge *pci_alloc_host_bridge(void)
 {
 	struct pci_host_bridge *bridge;
 
@@ -514,7 +514,6 @@  static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
 		return NULL;
 
 	INIT_LIST_HEAD(&bridge->windows);
-	bridge->bus = b;
 	return bridge;
 }
 
@@ -1727,9 +1726,21 @@  struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 	char bus_addr[64];
 	char *fmt;
 
+	bridge = pci_alloc_host_bridge();
+	if (!bridge)
+		return NULL;
+
+	bridge->dev.parent = parent;
+	bridge->dev.release = pci_release_host_bridge_dev;
+	error = pcibios_root_bridge_prepare(bridge);
+	if (error) {
+		kfree(bridge);
+		return NULL;
+	}
+
 	b = pci_alloc_bus();
 	if (!b)
-		return NULL;
+		goto err_out;
 
 	b->sysdata = sysdata;
 	b->ops = ops;
@@ -1738,26 +1749,15 @@  struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 	if (b2) {
 		/* If we already got to this bus through a different bridge, ignore it */
 		dev_dbg(&b2->dev, "bus already known\n");
-		goto err_out;
+		goto err_bus_out;
 	}
 
-	bridge = pci_alloc_host_bridge(b);
-	if (!bridge)
-		goto err_out;
-
-	bridge->dev.parent = parent;
-	bridge->dev.release = pci_release_host_bridge_dev;
+	bridge->bus = b;
 	dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
-	error = pcibios_root_bridge_prepare(bridge);
-	if (error) {
-		kfree(bridge);
-		goto err_out;
-	}
-
 	error = device_register(&bridge->dev);
 	if (error) {
 		put_device(&bridge->dev);
-		goto err_out;
+		goto err_bus_out;
 	}
 	b->bridge = get_device(&bridge->dev);
 	device_enable_async_suspend(b->bridge);
@@ -1814,8 +1814,10 @@  struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 class_dev_reg_err:
 	put_device(&bridge->dev);
 	device_unregister(&bridge->dev);
-err_out:
+err_bus_out:
 	kfree(b);
+err_out:
+	kfree(bridge);
 	return NULL;
 }