RE: [PATCH 1/7] PCI: dwc: Fix a bug of the case dw_pci->ops is NULL

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Hi Hou,

On Mon, Sep 7, 2020 at 6:37:55, Zhiqiang Hou <Zhiqiang.Hou@xxxxxxx> 
wrote:

> From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> 
> The dw_pci->ops may be a NULL, and fix it by adding one more check.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index b723e0cc41fb..bdf8938da9cd 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -140,7 +140,7 @@ u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
>  	int ret;
>  	u32 val;
>  
> -	if (pci->ops->read_dbi)
> +	if (pci->ops && pci->ops->read_dbi)
>  		return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
>  
>  	ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
> @@ -155,7 +155,7 @@ void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
>  {
>  	int ret;
>  
> -	if (pci->ops->write_dbi) {
> +	if (pci->ops && pci->ops->write_dbi) {
>  		pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
>  		return;
>  	}
> @@ -200,7 +200,7 @@ u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size)
>  	int ret;
>  	u32 val;
>  
> -	if (pci->ops->read_dbi)
> +	if (pci->ops && pci->ops->read_dbi)
>  		return pci->ops->read_dbi(pci, pci->atu_base, reg, size);
>  
>  	ret = dw_pcie_read(pci->atu_base + reg, size, &val);
> @@ -214,7 +214,7 @@ void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
>  {
>  	int ret;
>  
> -	if (pci->ops->write_dbi) {
> +	if (pci->ops && pci->ops->write_dbi) {
>  		pci->ops->write_dbi(pci, pci->atu_base, reg, size, val);
>  		return;
>  	}
> @@ -283,7 +283,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
>  {
>  	u32 retries, val;
>  
> -	if (pci->ops->cpu_addr_fixup)
> +	if (pci->ops && pci->ops->cpu_addr_fixup)
>  		cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
>  
>  	if (pci->iatu_unroll_enabled) {
> @@ -470,7 +470,7 @@ int dw_pcie_link_up(struct dw_pcie *pci)
>  {
>  	u32 val;
>  
> -	if (pci->ops->link_up)
> +	if (pci->ops && pci->ops->link_up)
>  		return pci->ops->link_up(pci);
>  
>  	val = readl(pci->dbi_base + PCIE_PORT_DEBUG1);
> -- 
> 2.17.1

Looks good to me.

Acked-by: Gustavo Pimentel <gustavo.pimentel@xxxxxxxxxxxx>








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