linux-kernel - Re: [PATCH] PCI/Layerscape: fix wrongly invoking of outbound window disable accessor

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Date:   Thu, 25 Oct 2018 08:45:22 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Z.q. Hou" <zhiqiang.hou@....com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        Roy Zang <roy.zang@....com>,
        "M.h. Lian" <minghuan.lian@....com>
Subject: Re: [PATCH] PCI/Layerscape: fix wrongly invoking of outbound window
 disable accessor

  $ git log --oneline --follow drivers/pci/controller/dwc/pci-layerscape.c | head
  6e0832fa432e PCI: Collect all native drivers under drivers/pci/controller/
  3f43ccc4ea1b PCI: dwc: Remove old MSI IRQs API
  8cfab3cf63cf PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate
  84d897d69938 PCI: layerscape: Change default error response behavior
  a335b122ba27 PCI: layerscape: Add support for ls1012a
  03fc6134c260 PCI: layerscape: Add support for ls1088a
  8f89357094e6 PCI: layerscape: Add support for ls2088a
  c3f909398827 PCI: layerscape: Remove unnecessary class code fixup
  e44abfed6fcb PCI: dwc: Add accessors for write permission of DBI read-only registers
  4a2745d760fa PCI: layerscape: Disable outbound windows configured by bootloader

Make yours match, e.g., "PCI: layerscape: Call dw_pcie_disable_atu()
correctly"

On Thu, Oct 25, 2018 at 08:53:37AM +0000, Z.q. Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> This issue is introduced by commit 4a2745d760fac ("PCI: layerscape: Disable
> outbound windows configured by bootloader").

Conventional commit reference:

  $ git --no-pager show -s --abbrev-commit --abbrev=12 --pretty=format:"%h (\"%s\")%n" 4a2745d760fac
  4a2745d760fa ("PCI: layerscape: Disable outbound windows configured by bootloader")

Holy cow, this has been broken since v4.14.  If fixing this makes a
difference, you might want to tag it for stable.

> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> ---
>  drivers/pci/controller/dwc/pci-layerscape.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
> index 69f3f1a5a782..b2085988dbee 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -88,7 +88,7 @@ static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
>  	int i;
>  
>  	for (i = 0; i < PCIE_IATU_NUM; i++)
> -		dw_pcie_disable_atu(pcie->pci, DW_PCIE_REGION_OUTBOUND, i);
> +		dw_pcie_disable_atu(pcie->pci, i, DW_PCIE_REGION_OUTBOUND);
>  }
>  
>  static int ls1021_pcie_link_up(struct dw_pcie *pci)
> -- 
> 2.17.1
>