linux-kernel - Re: [PATCH] PCI: dwc: don't assume the ops field in dw

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Message-ID: <20250319171814.GA1047025@bhelgaas>
Date: Wed, 19 Mar 2025 12:18:14 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ioana Ciornei <ioana.ciornei@....com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Frank Li <Frank.Li@....com>,
	Jingoo Han <jingoohan1@...il.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>, kw@...ux.com,
	Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: dwc: don't assume the ops field in dw_pcie always
 exists

On Wed, Mar 19, 2025 at 03:43:39PM +0200, Ioana Ciornei wrote:
> The blamed commit assumes that the ops field from dw_pcie is always
> populated. This is not the case for the layerscape-pcie driver which
> does not provide a dw_pcie_ops structure. The newly added
> dw_pcie_parent_bus_offset() function tries to dereference pci->ops
> which, in this case, is NULL.
> 
> Fix this by first checking if pci->ops is valid before dereferencing it.
> 
> Fixes: ed6509230934 ("PCI: dwc: Add dw_pcie_parent_bus_offset() checking and debug")
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>

Thank you very much!  Squashed into the "PCI: dwc: Add
dw_pcie_parent_bus_offset() checking and debug" commit so there will
be no bisection hole for this.

> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index e68e2aac210f..b5fd44c0d6ad 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -1170,7 +1170,7 @@ resource_size_t dw_pcie_parent_bus_offset(struct dw_pcie *pci,
>  
>  	of_property_read_reg(np, index, &reg_addr, NULL);
>  
> -	fixup = pci->ops->cpu_addr_fixup;
> +	fixup = pci->ops ? pci->ops->cpu_addr_fixup : 0;
>  	if (fixup) {
>  		fixup_addr = fixup(pci, cpu_phy_addr);
>  		if (reg_addr == fixup_addr) {
> -- 
> 2.34.1
>