PCI: mediatek: change to use the new host bridge interface

With the introduction of pci_scan_root_bus_bridge() there is no need to
export pci_register_host_bridge() to other kernel subsystems other than the
PCI compilation unit that needs it.

Make pci_register_host_bridge() static to its compilation unit and convert
the existing drivers usage over to pci_scan_root_bus_bridge().

Also, when probing the PCI host controller driver, if an error occurs, the probe
function code does not free memory allocated for the struct pci_host_bridge
resulting in memory leakage.

This patch fixes them by using the methods that introduces by Lorenzo.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
 drivers/pci/host/pcie-mediatek.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

On Tue, Jun 27, 2017 at 05:24:11PM +0800, Ryder Lee wrote:
> With the introduction of pci_scan_root_bus_bridge() there is no need to
> export pci_register_host_bridge() to other kernel subsystems other than the
> PCI compilation unit that needs it.
> 
> Make pci_register_host_bridge() static to its compilation unit and convert
> the existing drivers usage over to pci_scan_root_bus_bridge().
> 
> Also, when probing the PCI host controller driver, if an error occurs, the probe
> function code does not free memory allocated for the struct pci_host_bridge
> resulting in memory leakage.
> 
> This patch fixes them by using the methods that introduces by Lorenzo.
> 
> Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>

I rebased my pci/host-mediatek branch on top of pci/enumeration (which
contains the series from Lorenzo), and folded this into the initial
MediaTek driver commit.

This branch:

https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/host-mediatek&id=b6ca15d18881b784dc9efc5d81989be26ecd9fc8

should have all the MediaTek bits I know about.  Can you double-check
it, please?

If all goes well, I'll incorporate this into -next tomorrow.

> ---
>  drivers/pci/host/pcie-mediatek.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c
> index 3baafa8..514ef34 100644
> --- a/drivers/pci/host/pcie-mediatek.c
> +++ b/drivers/pci/host/pcie-mediatek.c
> @@ -482,12 +482,10 @@ static int mtk_pcie_register_host(struct pci_host_bridge *host)
>  	host->dev.parent = pcie->dev;
>  	host->ops = &mtk_pcie_ops;
>  
> -	err = pci_register_host_bridge(host);
> +	err = pci_scan_root_bus_bridge(host);
>  	if (err < 0)
>  		return err;
>  
> -	pci_scan_child_bus(host->bus);
> -
>  	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
>  	pci_bus_size_bridges(host->bus);
>  	pci_bus_assign_resources(host->bus);
> @@ -506,7 +504,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
>  	struct pci_host_bridge *host;
>  	int err;
>  
> -	host = pci_alloc_host_bridge(sizeof(*pcie));
> +	host = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
>  	if (!host)
>  		return -ENOMEM;
>  
> -- 
> 1.9.1
>

On Tue, Jun 27, 2017 at 05:30:40PM -0500, Bjorn Helgaas wrote:
> On Tue, Jun 27, 2017 at 05:24:11PM +0800, Ryder Lee wrote:
> > With the introduction of pci_scan_root_bus_bridge() there is no need to
> > export pci_register_host_bridge() to other kernel subsystems other than the
> > PCI compilation unit that needs it.
> > 
> > Make pci_register_host_bridge() static to its compilation unit and convert
> > the existing drivers usage over to pci_scan_root_bus_bridge().
> > 
> > Also, when probing the PCI host controller driver, if an error occurs, the probe
> > function code does not free memory allocated for the struct pci_host_bridge
> > resulting in memory leakage.
> > 
> > This patch fixes them by using the methods that introduces by Lorenzo.
> > 
> > Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
> 
> I rebased my pci/host-mediatek branch on top of pci/enumeration (which
> contains the series from Lorenzo), and folded this into the initial
> MediaTek driver commit.
> 
> This branch:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/host-mediatek&id=b6ca15d18881b784dc9efc5d81989be26ecd9fc8
> 
> should have all the MediaTek bits I know about.  Can you double-check
> it, please?

Sorry, that's wrong; I see your controller powerup stuff in patchwork, and
that's *not* included yet.

On Tue, 2017-06-27 at 18:20 -0500, Bjorn Helgaas wrote:
> On Tue, Jun 27, 2017 at 05:30:40PM -0500, Bjorn Helgaas wrote:
> > On Tue, Jun 27, 2017 at 05:24:11PM +0800, Ryder Lee wrote:
> > > With the introduction of pci_scan_root_bus_bridge() there is no need to
> > > export pci_register_host_bridge() to other kernel subsystems other than the
> > > PCI compilation unit that needs it.
> > > 
> > > Make pci_register_host_bridge() static to its compilation unit and convert
> > > the existing drivers usage over to pci_scan_root_bus_bridge().
> > > 
> > > Also, when probing the PCI host controller driver, if an error occurs, the probe
> > > function code does not free memory allocated for the struct pci_host_bridge
> > > resulting in memory leakage.
> > > 
> > > This patch fixes them by using the methods that introduces by Lorenzo.
> > > 
> > > Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
> > 
> > I rebased my pci/host-mediatek branch on top of pci/enumeration (which
> > contains the series from Lorenzo), and folded this into the initial
> > MediaTek driver commit.
> > 
> > This branch:
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/host-mediatek&id=b6ca15d18881b784dc9efc5d81989be26ecd9fc8
> > 
> > should have all the MediaTek bits I know about.  Can you double-check
> > it, please?
> 
> Sorry, that's wrong; I see your controller powerup stuff in patchwork, and
> that's *not* included yet.

Yes, that should be folded into the initial commit if possible.
Thanks for your help!

Ryder