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[PATCH v2 2/7] PCI: cadence: Check pcie-ops before using it.

Chen Wang posted 7 patches 5 months ago
There is a newer version of this series
[PATCH v2 2/7] PCI: cadence: Check pcie-ops before using it.
Posted by Chen Wang 5 months ago 
From: Chen Wang <unicorn_wang@outlook.com>

ops of struct cdns_pcie may be NULL, direct use
will result in a null pointer error.

Add checking of pcie->ops before using it for new
driver that may not supply pcie->ops.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
---
 drivers/pci/controller/cadence/pcie-cadence-host.c | 2 +-
 drivers/pci/controller/cadence/pcie-cadence.c      | 4 ++--
 drivers/pci/controller/cadence/pcie-cadence.h      | 6 +++---
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
index 59a4631de79f..fffd63d6665e 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-host.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
@@ -531,7 +531,7 @@ static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(0), addr1);
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(0), desc1);
 
-	if (pcie->ops->cpu_addr_fixup)
+	if (pcie->ops && pcie->ops->cpu_addr_fixup)
 		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
 
 	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(12) |
diff --git a/drivers/pci/controller/cadence/pcie-cadence.c b/drivers/pci/controller/cadence/pcie-cadence.c
index 70a19573440e..61806bbd8aa3 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.c
+++ b/drivers/pci/controller/cadence/pcie-cadence.c
@@ -92,7 +92,7 @@ void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 busnr, u8 fn,
 	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), desc1);
 
 	/* Set the CPU address */
-	if (pcie->ops->cpu_addr_fixup)
+	if (pcie->ops && pcie->ops->cpu_addr_fixup)
 		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
 
 	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(nbits) |
@@ -123,7 +123,7 @@ void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie,
 	}
 
 	/* Set the CPU address */
-	if (pcie->ops->cpu_addr_fixup)
+	if (pcie->ops && pcie->ops->cpu_addr_fixup)
 		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
 
 	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(17) |
diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
index 1d81c4bf6c6d..2f07ba661bda 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.h
+++ b/drivers/pci/controller/cadence/pcie-cadence.h
@@ -468,7 +468,7 @@ static inline u32 cdns_pcie_ep_fn_readl(struct cdns_pcie *pcie, u8 fn, u32 reg)
 
 static inline int cdns_pcie_start_link(struct cdns_pcie *pcie)
 {
-	if (pcie->ops->start_link)
+	if (pcie->ops && pcie->ops->start_link)
 		return pcie->ops->start_link(pcie);
 
 	return 0;
@@ -476,13 +476,13 @@ static inline int cdns_pcie_start_link(struct cdns_pcie *pcie)
 
 static inline void cdns_pcie_stop_link(struct cdns_pcie *pcie)
 {
-	if (pcie->ops->stop_link)
+	if (pcie->ops && pcie->ops->stop_link)
 		pcie->ops->stop_link(pcie);
 }
 
 static inline bool cdns_pcie_link_up(struct cdns_pcie *pcie)
 {
-	if (pcie->ops->link_up)
+	if (pcie->ops && pcie->ops->link_up)
 		return pcie->ops->link_up(pcie);
 
 	return true;
-- 
2.34.1
Re: [PATCH v2 2/7] PCI: cadence: Check pcie-ops before using it.
Posted by Bjorn Helgaas 5 months ago 
Drop period at end of subject.

On Wed, Sep 10, 2025 at 10:08:16AM +0800, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@outlook.com>
> 
> ops of struct cdns_pcie may be NULL, direct use
> will result in a null pointer error.
> 
> Add checking of pcie->ops before using it for new
> driver that may not supply pcie->ops.
> 
> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> ---
>  drivers/pci/controller/cadence/pcie-cadence-host.c | 2 +-
>  drivers/pci/controller/cadence/pcie-cadence.c      | 4 ++--
>  drivers/pci/controller/cadence/pcie-cadence.h      | 6 +++---
>  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
> index 59a4631de79f..fffd63d6665e 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence-host.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
> @@ -531,7 +531,7 @@ static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
>  	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(0), addr1);
>  	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(0), desc1);
>  
> -	if (pcie->ops->cpu_addr_fixup)
> +	if (pcie->ops && pcie->ops->cpu_addr_fixup)
>  		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
>  
>  	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(12) |
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.c b/drivers/pci/controller/cadence/pcie-cadence.c
> index 70a19573440e..61806bbd8aa3 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence.c
> @@ -92,7 +92,7 @@ void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 busnr, u8 fn,
>  	cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), desc1);
>  
>  	/* Set the CPU address */
> -	if (pcie->ops->cpu_addr_fixup)
> +	if (pcie->ops && pcie->ops->cpu_addr_fixup)
>  		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
>  
>  	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(nbits) |
> @@ -123,7 +123,7 @@ void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie,
>  	}
>  
>  	/* Set the CPU address */
> -	if (pcie->ops->cpu_addr_fixup)
> +	if (pcie->ops && pcie->ops->cpu_addr_fixup)
>  		cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
>  
>  	addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(17) |
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
> index 1d81c4bf6c6d..2f07ba661bda 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.h
> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
> @@ -468,7 +468,7 @@ static inline u32 cdns_pcie_ep_fn_readl(struct cdns_pcie *pcie, u8 fn, u32 reg)
>  
>  static inline int cdns_pcie_start_link(struct cdns_pcie *pcie)
>  {
> -	if (pcie->ops->start_link)
> +	if (pcie->ops && pcie->ops->start_link)
>  		return pcie->ops->start_link(pcie);
>  
>  	return 0;
> @@ -476,13 +476,13 @@ static inline int cdns_pcie_start_link(struct cdns_pcie *pcie)
>  
>  static inline void cdns_pcie_stop_link(struct cdns_pcie *pcie)
>  {
> -	if (pcie->ops->stop_link)
> +	if (pcie->ops && pcie->ops->stop_link)
>  		pcie->ops->stop_link(pcie);
>  }
>  
>  static inline bool cdns_pcie_link_up(struct cdns_pcie *pcie)
>  {
> -	if (pcie->ops->link_up)
> +	if (pcie->ops && pcie->ops->link_up)
>  		return pcie->ops->link_up(pcie);
>  
>  	return true;
> -- 
> 2.34.1
>

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